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Plant function and evolutionary biology
RESEARCH ARTICLE

Cytoplasmic glucose-6-phosphate dehydrogenase plays an important role in the silicon-enhanced alkaline tolerance in highland barley

Qiang He A , Ping Li B , Wenya Zhang A and Yurong Bi https://orcid.org/0000-0003-2412-3673 A C
+ Author Affiliations
- Author Affiliations

A Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou 730000, People’s Republic of China.

B State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, People’s Republic of China.

C Corresponding author. Email: yrbi@lzu.edu.cn

Functional Plant Biology 48(2) 119-130 https://doi.org/10.1071/FP20084
Submitted: 25 March 2020  Accepted: 22 July 2020   Published: 11 August 2020

Abstract

Glucose-6-phosphate dehydrogenase (G6PDH), as a key enzyme in the pentose phosphate pathway, extensively responds to the biotic and abiotic stresses. In this study we focussed on the G6PDH role in the alleviation of alkaline stress induced by silicon (Si) in highland barley. Application of Si reduced the water loss and malondialdehyde (MDA) and reactive oxygen species (ROS) contents, improved the fresh weight, photosynthesis, K+ content, and the superoxide dismutase (SOD) and catalase (CAT) activities, thus alleviating the damage caused by alkaline stress. The G6PDH activity, especially the cytoplasmic G6PDH, significantly increased under alkaline stress, and was further stimulated by the addition of exogenous Si. Meanwhile, the levels of NADPH and reduced glutathione (GSH) showed similar profiles to G6PDH activity under NaHCO3 and NaHCO3 + Si treatments. The inhibition of G6PDH activity by glucosamine abolished the relieving effect of Si on alkaline stress, which was manifested in the increase of ROS and the decrease of GSH content. Together, our results suggest that Si-enhanced tolerance of alkaline stress may be related to the regulation of GSH levels by the cytoplasmic G6PDH in highland barley.

Additional keywords: alkaline stress, G6PDH, GSH, highland barley, silicon.


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