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Plant function and evolutionary biology

Functional Plant Biology

Functional Plant Biology

Functional Plant Biology publishes new and significant information on the functional biology of plants at all scales from the molecular through whole plant to community. Read more about the journalMore

Editor-in-Chief: Sergey Shabala

Current Issue

Functional Plant Biology

Volume 44 Number 11 2017

It is uncertain how elevated CO2 will affect photosynthesis during extreme events. Seven genotypes of Eucalyptus camaldulensis var. camaldulensis were grown in 400 or 640 parts per million CO2, and photosynthetic electron transport, stomatal conductance and net CO2 uptake were measured before, during and after a 4-day heatwave. The correlations between climate of origin and physiological responses depend on growth CO2, which makes it difficult to predict species responses to episodic aspects of climate change.

Rice is a staple food in many countries and local production is carried out under unfavourable conditions, so effective and affordable alternatives to enhance local production are mandatory to palliate hunger. The underlying hypothesis is that certain beneficial bacterial strains can boost plant’s adaptive metabolism to overcome environmental limitations, so this study aimed to identify bacterial genes involved in beneficial effects on plants by creating random mutants of an effective Pseudomonas strain by evaluating loss of protection against salt stress in rice, and growth of tomato. Mutants were mapped and putative responsible genes sequenced. This study reveals the effectiveness of beneficial bacteria on two relevant crops, phylogenetically distant, so it appears as a challenging alternative to meet food security.

FP17110The temperature response of leaf dark respiration in 15 provenances of Eucalyptus grandis grown in ambient and elevated CO2

Michael J. Aspinwall, Vinod K. Jacob, Chris J. Blackman, Renee A. Smith, Mark G. Tjoelker and David T. Tissue
pp. 1075-1086

Leaf respiration (R) is an important determinant of tree and forest function, yet the impacts of rising atmospheric CO2 on leaf R remain poorly understood. We found that leaf respiration is largely unaffected by elevated CO2, and is relatively similar across seedlings of geographically and climatically diverse populations of Eucalyptus grandis. We conclude that elevated CO2 is unlikely to change leaf R in E. grandis.

FP17096Variation in photosynthetic traits related to access to water in semiarid Australian woody species

Rachael H. Nolan, Tonantzin Tarin, Kendal A. Fairweather, James Cleverly and Derek Eamus
pp. 1087-1097

Soil water availability is a key factor limiting rates of carbon assimilation in plants. However, we found that as water availability declined, investment in foliar nitrogen, photosynthetic capacity and intrinsic water-use efficiency increased across eight co-occurring tree species in semiarid Australia. We conclude that differential access to water is an important factor driving variability of traits related to carbon gain.

The mechanism by which flowers regulate their function and structure to maintain water balance is unclear. We found that flowers of two Magnolia species consumed less than half the water that leaves did, and explored different hydraulic strategies in flowers and leaves to sustain hydraulic safety. This study contributes new knowledge to the field of floral hydraulics.

FP17060Relative contribution of photorespiration and antioxidative mechanisms in Caragana korshinskii under drought conditions across the Loess Plateau

Juan Bai, Tai Kang, Hongdou Wu, Baiyan Lu, Xiaogang Long, Xinjuan Luo, Yanyu Zhang, Yulu Zhou and Chunmei Gong
pp. 1111-1123

Photorespiration plays a positive role in coping with drought stress in plants. Here, the drought-tolerant plant Caragana korshinskii responded to drought with high photorespiration and strong antioxidative system that may improve the ability of coping with drought. These findings help us further understand how photorespiration and antioxidative systems co-ordinate to improve the tolerance to drought in plants.

FP17066Vegetative desiccation tolerance of Tripogon spicatus (Poaceae) from the tropical semiarid region of northeastern Brazil

Saulo de T. Aidar, Agnaldo R. de M. Chaves, Paulo I. Fernandes Júnior, Melquisedec de S. Oliveira, Benjamim P. da Costa Neto, Tercílio Calsa Junior and Carolina V. Morgante
pp. 1124-1133

Resurrection plants exposed to extreme dehydration are able to recover physiological functionality after rehydration, because of their ability to induce protection and repair mechanisms. We demonstrated that the Brazilian semiarid grass Tripogon spicatus is able to tolerate complete vegetative dehydration, maintaining chlorophyll content and increasing photosynthetic rates after rehydration.

FP17079Divergence in plant water-use strategies in semiarid woody species

Rachael H. Nolan, Kendal A. Fairweather, Tonantzin Tarin, Nadia S. Santini, James Cleverly, Ralph Faux and Derek Eamus
pp. 1134-1146

The stable co-existence of a diversity of plant species within a single biome is possible if the species access different resources. In semiarid Australia we found that co-occurring tree species had differing access to water, resulting in multiple plant water-use strategies in this water-limited environment. These differing strategies have important implications for the survival of these species under drought.

Online Early

The peer-reviewed and edited version of record published online before inclusion in an issue

Published online 16 October 2017

FP17181NaCl markedly improved the reproductive capacity of the euhalophyte Suaeda salsa

Jianrong Guo, Yandi Li, Guoliang Han, Jie Song and Baoshan Wang

Reproductive growth is very important for plant survival and population establishment under salinity. It remains unknown whether the reproductive process of Suaeda salsa is affected by salinity. NaCl markedly increased the reproductive growth of S. salsa by increasing flower number and fertility. Unravelling the mechanisms of plant salt tolerance will be helpful for improving agricultural production.

Published online 16 October 2017

FP17184Protecting cotton crops under elevated CO2 from waterlogging by managing ethylene

Ullah Najeeb, Daniel K. Y. Tan, Michael P. Bange and Brian J. Atwell

Ethylene-induced abscission of young cotton fruits is a major lint yield limiting factor in cotton crop production under stressed environments. Extreme weather events such as long-term soil waterlogging and elevated CO2 can increase fruit loss caused by ethylene production in cotton. Our study showed that the physiological and yield performance of cotton crops under future environments can potentially be improved by mitigating ethylene action.

Published online 10 October 2017

FP17167Co-inoculation of maize with Azospirillum brasilense and Rhizobium tropici as a strategy to mitigate salinity stress

Josiane Fukami, Clara de la Osa, Francisco Javier Ollero, Manuel Megías and Mariangela Hungria

Salinity is a major factor affecting crop production worldwide. We identified enzymatic and genetic mechanisms in maize that confer tolerance against abiotic stresses when inoculated with plant growth-promoting bacteria. Inoculation with the elite strains identified in this study, of Azospirillum brasilense (Ab-V6) and Rhizobium tropici (CIAT 899) might represent a valuable and sustainable strategy to mitigate salinity stress.

In this work we tested the response of PEPC and NAD-ME in the C4-NAD-ME subtype plant Salsola lanata (Chenopodiaceae) under drought stress. Only severe stress limited PEPC enzyme activity (at pH 8.0) significantly, and this was related with decreased PEPC mRNA. More phosphorylated status of PEPC enzyme in plants is under moderate stress compared with other treatments. The change of NAD-ME activity coincided with a change of leaf water content rather than the amount of α-NAD-ME mRNA and protein.

Published online 02 October 2017

FP17031The pros and cons of GM crops

Jennifer A. Thomson

By 2015 genetically modified (GM) crops had been commercialised for 20 years. This technology ranks amongst the most rapidly accepted by farmers, but are there downsides to these introductions? This review considers the advantages and potential disadvantages of GM crops.

Published online 02 October 2017

FP16444Aquaporin AtTIP5;1 as an essential target of gibberellins promotes hypocotyl cell elongation in Arabidopsis thaliana under excess boron stress

Yongqi Pang, Jintong Li, Bishu Qi, Mi Tian, Lirong Sun, Xuechen Wang and Fushun Hao

Gibberellins (GAs) promote hypocotyl elongation by controlling the expression of many genes in plants. However, only a few target genes of GAs have been identified to date. The paper provides strong evidence that tonoplast aquaporin AtTIP5;1 mediates GA-stimulated hypocotyl cell elongation under excess boron condition in Arabidopsis. The finding highlights the essential roles of vacuoles and boron in GA signalling in plants.

Published online 27 September 2017

FP17133Expressing Arabidopsis thaliana V-ATPase subunit C in barley (Hordeum vulgare) improves plant performance under saline condition by enabling better osmotic adjustment

Getnet D. Adem, Stuart J. Roy, Yuqing Huang, Zhong-Hua Chen, Feifei Wang, Meixue Zhou, John P. Bowman, Paul Holford and Sergey Shabala

Salinity is a global problem affecting agriculture. Here we show that overexpression of vacuolar ATPase subunit C is beneficial in improving barley performance under saline conditions. This effect is explained by transgenic lines being able to rely more on the use of Na+ and K+ for osmotic adjustment rather than spending energy for de novo synthesis of organic osmolytes.

Published online 27 September 2017

FP17049Variation in shoot tolerance mechanisms not related to ion toxicity in barley

Joanne Tilbrook, Rhiannon K. Schilling, Bettina Berger, Alexandre F. Garcia, Christine Trittermann, Stewart Coventry, Huwaida Rabie, Chris Brien, Martin Nguyen, Mark Tester and Stuart J. Roy

Salinity reduces the grain yield of cereal crops. In this study, nondestructive and destructive phenotyping was used to evaluate 24 predominately Australian barley lines at 0, 150 and 250 mM NaCl. Lines with higher salinity tolerance were better able to maintain their growth rates shortly after salt treatment and exclude Na+ from their shoots. This study shows that variation in shoot tolerance mechanisms unrelated to ion toxicity exists in barley and suggests that breeding new varieties with increased shoot ion-independent tolerance is possible.

Published online 20 September 2017

FP17040Small rainfall pulses affected leaf photosynthesis rather than biomass production of dominant species in semiarid grassland community on Loess Plateau of China

Peifeng Xiong, Jiali Shu, He Zhang, Zhao Jia, Jinxi Song, Jairo A. Palta and Bingcheng Xu

Rainfall pulses in water-limited regions significantly affect ecosystem structure and function. After comparing the effects of size and timing of stimulated rainfall pulses on dominant grassland species, we concluded that small pulses had a greater effect on leaf photosynthesis rather than biomass production, and the magnitude was correlated with species type and growth season. These results facilitate the regional eco-adaptability evaluation of species and prediction of vegetation succession under altered rainfall regimes.

Interspecific differences in photosynthetic attributes of Chardonnay and Merlot grapevines have been established. The cause of such differences were attributed to a higher carboxylation and regeneration capacity in the Merlot leaves, especially at high temperatures and cultivar differences were exacerbated as the season progressed. Differences in biochemical processes related to assimilation at high temperatures were measured between the cultivars, and these may relate to inherent differences in temperature tolerance between these closely related cultivars.

Published online 07 September 2017

FP17165The effect of elevated atmospheric [CO2] and increased temperatures on an older and modern cotton cultivar

Katrina J. Broughton, Michael P. Bange, Remko A. Duursma, Paxton Payton, Renee A. Smith, Daniel K. Y. Tan and David T. Tissue

Rising atmospheric [CO2] and temperature under projected climate change scenarios may have significant impacts on the physiology and yield of cotton. We quantified the response of cotton cultivars grown in elevated [CO2] and temperature and found substantial potential to increase breeding selection in future climates. Understanding the implications of integrated environmental impacts on cotton is critical for developing cotton systems that are resilient to stresses induced by climate change.

Published online 01 September 2017

FP17151Endoplasmic reticulum stress regulates glutathione metabolism and activities of glutathione related enzymes in Arabidopsis

Baris Uzilday, Rengin Ozgur, A. Hediye Sekmen and Ismail Turkan

Prolonged endoplasmic reticulum (ER) stress oxidises the cellular glutathione pool. To elucidate the role of glutathione during ER stress, biosynthesis and degradation of glutathione and activities of related enzymes were evaluated. Our data demonstrated that glutathione biosynthesis and an apoplastic but not cytoplasmic catabolic pathway was induced. In addition, the activities of enzymes that use glutathione as a substrate were increased by ER stress.

Published online 24 August 2017

FP17033Effects of Ni2+ and Cu2+ on K+ and H+ currents in lily pollen protoplasts

Maria Breygina, Denis V. Abramochkin, Nikita Maksimov and Igor Yermakov

Heavy metals disrupt pollen germination in many species, but the mechanism of their action remained unstudied. Here we report that Cu2+ and Ni2+ affect H+ current and K+ current, respectively, in lily pollen protoplasts; Cu2+ as well enhances reactive oxygen species accumulation. Thus, we reveal the targets for heavy metals (Cu2+ and Ni2+) in the pollen grain plasma membrane.

Published online 17 August 2017

FP17032Light inhibition of foliar respiration in response to soil water availability and seasonal changes in temperature in Mediterranean holm oak (Quercus ilex) forest

Matthew H. Turnbull, Romà Ogaya, Adrià Barbeta, Josep Peñuelas, Joana Zaragoza-Castells, Owen K. Atkin, Fernando Valladares, Teresa E. Gimeno, Beatriz Pías and Kevin L. Griffin

Leaf respiration is an integral component of plant growth and the global carbon cycle, and it is typically lower during the day than at night. We investigated leaf respiration in Mediterranean holm oak woodland, and found that light inhibition was not strongly related to changes in soil water content or ambient temperature. The findings have implications for predictive models that seek to calculate plant carbon balance.

Published online 15 August 2017

FP16436Roles played by invertase and gene expression in the development of the horn-shaped gall on leaves of Rhus chinensis

Zhen-Yuan Ruan, Xiao-Ming Chen, Pu Yang and Bing-Yi Wang

Horn-shaped gall is of great value in food, medicine and the industrial field, so the control of its formation will be helpful to increase the products. Vacuolar invertase is related to the rapid expansion of the galls, but ionically bound cell wall invertase is involved in the rapid growth of tissues. This might also be found in other kinds of galls.

Published online 10 July 2017

FP17085Unravelling the plant signalling machinery: an update on the cellular and genetic basis of plant signal transduction

Vadim Demidchik, Frans Maathuis and Olga Voitsekhovskaja

Signalling is a central phenomenon in biology. It is crucial to all aspects of plant physiology including growth, development and interactions with the environment. Here, novel hypotheses and experimental data regarding signalling hubs, second messengers, programmed cell death and autophagy are presented from the Fourth Plant Signalling and Behaviour Symposium in Sankt Petersburg, Russia, June 2016).

Published online 29 June 2017

FP17116Myotubularins, PtdIns5P, and ROS in ABA-mediated stomatal movements in dehydrated Arabidopsis seedlings

Akanksha Nagpal, Ammar Hassan, Ivan Ndamukong, Zoya Avramova and František Baluška

Arabidopsis myotubularins AtMTM1 and AtMTM2 control stomata movements via reactive oxygen species (ROS) homeostasis under drought stress. Acting as a secondary messenger in the ABA-induced ROS production in guard cells, PtdIns5P emerges as an evolutionarily conserved signalling molecule downstream of AtMTMs calibrating cellular ROS levels under stress. AtMTM1 and AtMTM2 activities balance ABA-induced ROS and cellular homeostasis under dehydration stress.

Published online 17 May 2017

FP16418The levels of peroxisomal catalase protein and activity modulate the onset of cell death in tobacco BY-2 cells via reactive oxygen species levels and autophagy

Elena V. Tyutereva, Ksenia S. Dobryakova, Andreas Schiermeyer, Maria F. Shishova, Katharina Pawlowski, Vadim Demidchik, Sigrun Reumann and Olga V. Voitsekhovskaja

Peroxisomes balance the cellular levels of reactive oxygen species (ROS) and therefore should modulate ROS-regulated programs like autophagy or cell death. We used tobacco suspension cultures to show that degradation of peroxisomes via autophagy was a prerequisite for cell death and depended on the levels of the major peroxisomal protein, catalase. This suggests a role of plant catalase in the regulation of peroxisome turnover and autophagic cell death.

Published online 19 April 2017

FP16339Electrical signalling in Nitellopsis obtusa: potential biomarkers of biologically active compounds

Vilma Kisnieriene, Indre Lapeikaite and Vilmantas Pupkis

The electrophysiological response pattern of Nitellopsis obtusa cell can be assessed to evaluate the effect of many biologically active compounds. We illustrate a variety of electrophysiological approaches for the investigations of electrical signaling after chemical treatment in vivo. The insights about the Characean model system are likely to hold for plants in general and even deepen the understanding of the plant evolution.

Published online 13 April 2017

FP16324Molecular insights into the functional role of nitric oxide (NO) as a signal for plant responses in chickpea

Parankusam Santisree, Pooja Bhatnagar-Mathur and Kiran K. Sharma

Although many studies established nitric oxide (NO) as a signaling molecule in plants, the identification of target molecules of NO has remained elusive due to the lack of in depth molecular studies. Our quantitative proteome analysis suggests the differential regulation of 248 proteins and dynamic regulation of metabolic pathways by exogenous NO donor in chickpea. This is the first report in legumes pointing at the potential candidates that attribute the reported functions of NO in plants.

Published online 29 March 2017

FP16379Photochemical activity changes accompanying the embryogenesis of pea (Pisum sativum) with yellow and green cotyledons

Galina Smolikova, Vladimir Kreslavski, Olga Shiroglazova, Tatiana Bilova, Elena Sharova, Andrej Frolov and Sergei Medvedev

We studied the dynamics of photochemical activity in seed coats and cotyledons during development of yellow- and green-seeded pea cultivars by using the pulse amplitude modulation fluorometric analysis. The fast transients of the chlorophyll a fluorescence revealed higher photochemical activity in the coats of yellow-seeded cultivar at the early- and middle cotyledon stages of seed development in comparison to those observed in the green-seeded ones. Photochemical activity in the cotyledons of both cultivars could not be any more detected at the late cotyledon stage. This process was triggered by dehydration of seed tissues.

Root growth is controlled by phytohormones, but what cellular processes are regulated and how it occurs is still an open question. Here it is shown that cytokinin affects root growth mainly through its effect on cell proliferation, and does not initiate the transition of cells to differentiation as previously thought. Cellular analysis performed could be applied for the analysis of how any plant hormone influences developmental processes in plant roots.

Published online 24 March 2017

FP16283Cyclosis-mediated long distance communications of chloroplasts in giant cells of Characeae

Anna V. Komarova, Vladimir S. Sukhov and Alexander A. Bulychev

Intracellular communications in plant cells of large dimensions rely primarily on cytoplasmic streaming, because diffusion is too slow for the transport on mm-scale distances. Illumination of a small cell spot at a various distances from the point of chlorophyll fluorescence measurements revealed the wave-like propagation of the fluorescence response along the cell length. The results show that the photosynthetic function of immobile chloroplasts under constant light can be affected by long-distance transmission of a photosynthetically active metabolite from the remote cell parts.

Understanding the molecular mechanisms of plant development constitutes an important field of investigations in the current era of plant biology research. Nitric oxide signalling regulates a variety of biochemical processes in plants. Present review provides an in-depth analysis of our current understanding on the subject, particularly with reference to plant growth under stress conditions.

Published online 22 March 2017

FP16384Melatonin in plant signalling and behaviour

Lauren A. E. Erland, Praveen K. Saxena and Susan J. Murch

Melatonin is an important hormone and signalling molecule in all forms of life including humans, plants and bacteria. Recent plant physiology and genomic experiments have described the redirection of plant growth and metabolism, and demonstrated a diversity of genes involved in response to melatonin, however, the exact metabolic cascades that translate melatonin signals into physiological responses is not fully understood. This review provides an overview of melatonin mediated signalling manifested as behaviours and its roles in basic and industrial research.

Published online 16 March 2017

FP16326Sunpatiens compact hot coral: memristors in flowers

Alexander G. Volkov and Eunice K. Nyasani

Memristors, or resistors with memory, exist in vivo as components of plasma membranes in plants, fruits, roots and seeds. Authors found memristors in an androecium, spur, petals and pedicel in Sunpatiens flowers. The discovery of memristors in Sunpatiens (Impatiens spp.) creates a new direction in the modelling and understanding of electrophysiological phenomena and memory elements in flowers.

Published online 14 March 2017

FP16348Phloem fibres as motors of gravitropic behaviour of flax plants: level of transcriptome

Oleg Gorshkov, Natalia Mokshina, Nadezda Ibragimova, Marina Ageeva, Natalia Gogoleva and Tatyana Gorshkova

Plant fibres with a tertiary cell wall (G-layer) may function as plant ‘muscles’. Large-scale transcriptome profiling of isolated flax phloem fibres permitted to identify the major players and regulatory elements that operate during graviresponce specifically in the fibres of the pulling stem side. The suggested mechanisms of phloem fibre involvement in tropisms may considerably renew the concept of herbaceous plant behaviour upon gravistimulation.

Published online 14 March 2017

FP16318Plant ion channels and transporters in herbivory-induced signalling

Shuitian Luo, Xiao Zhang, Jinfei Wang, Chunyang Jiao, Yingying Chen and Yingbai Shen

Clarifying herbivory-induced plant cellular signalling is a critical step to push the research of plant-herbivore interaction forward. We review the role of ion channels/transporters in modulating herbivory-induced early signalling events and rapid systemic signal transmission in plants. This work provides a comprehensive source of information about plant defensive strategies upon attack.

Published online 14 March 2017

FP16292Studies of cytokinin receptor–phosphotransmitter interaction provide evidences for the initiation of cytokinin signalling in the endoplasmic reticulum

Sergey N. Lomin, Yulia A. Myakushina, Dmitry V. Arkhipov, Olga G. Leonova, Vladimir I. Popenko, Thomas Schmülling and Georgy A. Romanov

Cytokinin is an important plant hormone and its mode of action has been extensively studied; however, to date, the subcellular localisation of cytokinin perception and signal transduction remains a matter of debate. This study describes cytokinin receptor–phosphotransmitter interaction and its subcellular localisation in living plant cells and it provides several experimental evidences for receptor activity at the endoplasmic reticulum (ER) membrane. It is concluded that intracellular cytokinins within the ER lumen may play an important role in cytokinin signalling, at least in some cell types.

Published online 07 March 2017

FP16377Cell differentiation in nitrogen-fixing nodules hosting symbiosomes

Anna V. Tsyganova, Anna B. Kitaeva and Viktor E. Tsyganov

Rhizobium bacteria, which live within the root nodules of legumes, allow plants to capture nitrogen gas from the atmosphere and use it for their own growth. Central to this symbiosis is an intracellular structure, called the symbiosome, in which nitrogen-fixing bacterial cells exchange components with the host cells that harbor them. Recent research on the differentiation of symbiosomes and of the infected cells that accommodate them has helped to decipher some general molecular mechanisms of cell differentiation.

Published online 03 March 2017

FP16342Parameters of electrical signals and photosynthetic responses induced by them in pea seedlings depend on the nature of stimulus

Vladimir Vodeneev, Maxim Mudrilov, Elena Akinchits, Irina Balalaeva and Vladimir Sukhov

Plants, like animals, produce electrical signals in response to various external influences. In this study we raised a question whether the electrical signals transmit information about the nature of the stimulus, and found out that different stimuli induce signals of varied parameters. The obtained results explain how plants adapt to changing environment.

Published online 28 February 2017

FP16380The role of ion disequilibrium in induction of root cell death and autophagy by environmental stresses

Vadim Demidchik, Elena V. Tyutereva and Olga V. Voitsekhovskaja

Environmental stresses are main causes for low agricultural productivity. At the cellular level, stresses induce generation of reactive oxygen species (ROS), ion disequilibrium, autophagy and programmed cell death (PCD). Here we propose that these processes interact and that ROS and ion disequilibrium are triggers of autophagy and PCD. Overall, presented data contribute to understanding plant stress physiology.

Transient elevation of cytosolic Ca2+, also referred as a Ca2+signal, is as central phenomenon of plant signalling. Plants evolved sophisticated systems to initiate, amplify and terminate Ca2+ signals. Structure and properties of these systems, including Ca2+-permeable ion channels, Ca2+-ATPases, Ca2+/H+ exchangers and ‘ROS-Ca2+ hub’ are discussed here. They provide a fine-tuned mechanism for encoding diverse external and internal stimuli.

Published online 13 February 2017

FP16347Spatial distribution of organelles in leaf cells and soybean root nodules revealed by focused ion beam-scanning electron microscopy

Brandon C. Reagan, Paul J. -Y. Kim, Preston D. Perry, John R. Dunlap and Tessa M. Burch-Smith

Focussed ion bean scanning electron microscopy (FIB-SEM) is a technique that can be used to generate 3D renderings of cells and their contents. Although FIB-SEM has been regularly used to investigate animal cells and tissues, it has rarely been deployed to study plant structures. Here we demonstrate that FIB-SEM can easily be used to study plant samples and have discovered previously unknown arrangements of organelles and membranes in those samples.

Published online 03 February 2017

FP16322Formation mechanisms of superoxide radical and hydrogen peroxide in chloroplasts, and factors determining the signalling by hydrogen peroxide

Boris N. Ivanov, Maria M. Borisova-Mubarakshina and Marina A. Kozuleva

Photosynthetic electron transport chain is not only source of ATP and NADPH for photosynthesis; it is a sensor, informing adaptation systems of plant about environmental changes. An important transmitter of this information is hydrogen peroxide whose mechanisms of formation are presented, laying special emphasis on the formation outside and within thylakoid membrane. It is discussed, that the formation place can ensure definite signal about the specific environmental change.

Published online 11 January 2017

FP16321Arabidopsis thaliana phytaspase: identification and peculiar properties

Nina V. Chichkova, Raisa A. Galiullina, Larisa V. Mochalova, Svetlana V. Trusova, Zulfazli M. Sobri, Patrick Gallois and Andrey B. Vartapetian

Although plant proteases of the phytaspase family are important contributors to stress-induced plant cell death, phytaspase of a classical model plant Arabidopsis thaliana has escaped identification thus far. We identified the Arabidopsis phytaspase-encoding gene and characterised the recombinant enzyme. Substrate specificity and properties of the Arabidopsis phytaspase display both important similarities with and distinctions from the already characterised phytaspases.

Published online 20 December 2016

FP16337cGMP signalling in plants: from enigma to main stream

Jean-Charles Isner and Frans J. M. Maathuis

Cyclic GMP (cGMP) signalling in plants is crucial for many physiological processes. Recent analytical and genomic developments now allow detailed studies into the biochemistry and physiological role of cGMP in plants, and the latest findings are reviewed in this article.

Published online 16 December 2016

FP16338Two-pore cation (TPC) channel: not a shorthanded one

Igor Pottosin and Oxana Dobrovinskaya

Large conductance SV/TPC1 channels are ubiquitously and abundantly expressed in the vacuolar membranes of higher plants. They are unique established Ca2+-permeable channels in vacuoles, but their activity is strongly negatively controlled, so that they were believed to be inactive or to act only locally. Recent evidence suggests the key role of SV/TPC1 channels in the long-distance Ca2+ signalling.

Plants adapt to environmental light conditions with the use of the sophisticated phytochrome system. In this work, polymorphism of its major component – phytochrome A– was investigated. With the use of transgenic Arabidopsis and fluorescence technique, it was shown that two molecular types of the photoreceptor differ by the state of phosphorylation and their existence accounts for its complex functions.

Published online 09 November 2016

FP16242Rapid changes in root HvPIP2;2 aquaporins abundance and ABA concentration are required to enhance root hydraulic conductivity and maintain leaf water potential in response to increased evaporative demand

Dmitry S. Veselov, Dmitry S. Veselov, Guzel V. Sharipova, Guzel V. Sharipova, Stanislav Yu. Veselov, Stanislav Yu. Veselov, Ian C. Dodd, Ian C. Dodd, Igor Ivanov, Igor Ivanov, Guzel R. Kudoyarova and Guzel R. Kudoyarova

The ABA-deficient barley mutant Az34 and wild type (WT) were exposed to air warming. Although transpiration rate of both genotypes increased, leaf water potential decreased in the mutant but was maintained in WT plants. Only WT plants showed increased root ABA accumulation, which increased root hydraulic conductivity and aquaporin abundance, which seems important in maintaining leaf hydration.

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