Effects of environmental conditions on the production of hypocotyl hairs in seedlings of Melaleuca ericifolia (swamp paperbark)
Randall W. Robinson A C , Paul I. Boon A , Nina Sawtell B , Elizabeth A. James B and Robert Cross B
A Institute for Sustainability and Innovation, Victoria University, St Albans Campus, PO Box 14428, MCMC, Vic. 8001, Australia.
B Royal Botanic Gardens Melbourne, Private Bag 2000, Birdwood Avenue, South Yarra, Vic. 3141, Australia.
C Corresponding author. Email: Randall.firstname.lastname@example.org
Australian Journal of Botany 56(7) 564-573 http://dx.doi.org/10.1071/BT06186
Submitted: 1 September 2006 Accepted: 20 October 2008 Published: 26 November 2008
The production of hypocotyl hairs in the early stages of seedling development can strongly influence the success with which plants recruit sexually in harsh environments. Although wetlands are one type of environment in which seedlings might be expected to develop hypocotyl hairs, there have been few studies of these structures in the woody aquatic plants. We investigated the production of hypocotyl hairs in Melaleuca ericifolia Sm., a small wetland tree widely distributed across swampy coastal areas of south-eastern Australia, in relation to water availability, salinity, temperature and light regime. Hypocotyl hairs were ~20 mm long × 30 μm wide; in contrast, root hairs were generally less than 5 mm long and 15 μm wide. Hypocotyl hairs were produced only under a narrow range of environmental conditions—low salinity, low water availability, moderate temperature, and darkness—and seedlings that failed to produce hypocotyl hairs did not survive. Since the conditions under which hypocotyl hairs were produced were at least as, and possibly even more, restricted than those required for successful germination of seeds, it is likely that the successful sexual recruitment of M. ericifolia would be rare and episodic under conditions existing in most coastal wetlands in south-eastern Australia.
Hypocotyl features of Myrtus communis (Myrtaceae): a many-sided strategy for possible enhancement of seedling establishment in the Mediterranean environment.
Botanical Journal of the Linnean Society
Coleorhiza in Myrtaceae.
The interaction between waterlogging and salinity in higher plants: causes, consequences and implications.
Plant and Soil
The swamp paper-bark.
Ecology and conservation of remnant Melaleuca ericifolia stands in the Tamar Valley, Tasmania.
Australian Journal of Botany
Field studies on seed germination and seedling development in Zostera marina L.
Wetlands and waterbirds of the Snowy River and Gippsland Lakes catchment.
Proceedings of the Royal Society of Victoria
Studies of ibises in Victoria, I: records of breeding since 1955.
(1977) An identification of the aquatic vegetation in the Gippsland Lakes. Report to the Ministry for Conservation, Victoria Environmental Studies Programme. Ministry for Conservation, Melbourne.
Swamp reclamation in Victoria.
Journal of the Institution of Engineers, Australia
(2002) Root hairs. In ‘The arabidopsis book’. (Eds C Somerville, E Meyerowitz) pp. 1–22. (The American Society of Plant Biologists: Rockville, MD)
(1991) Root hairs. In ‘Plant roots: the hidden half’. (Eds Y Waisel, A Eshel, U Kafkafi) pp. 111–126. (Marcel Dekker: New York)
(1996) Myrtaceae. In ‘Flora of Victoria. Vol. 3. Dicotyledons Winteraceae to Myrtaceae’. (Eds NG Walsh, TJ Entwistle) pp. 942–1044. (Inkata Press: Melbourne)
Woody plant restoration and natural regeneration in wet meadow at Comonderry Swamp on the south coast of New South Wales.
Marine and Freshwater Research
(1997) ‘Register of wetland restoration projects in Australia and New Zealand.’ Wetland Management Program. (Department of Environment and Natural Resources: Adelaide)
Morphology of germination and establishment of aquatic seedlings in Alismataceae and Hydrocharitaceae.
Responses of woody plants to flooding and salinity.
Tree Physiology Monographs
Root anatomy and rhizosphere ultrastructure in tropical seagrasses.
Australian Journal of Marine and Freshwater Research
Fruits, seeds and germination in the seagrass Halophyloa ovalis (Hydrocharitaceae)
Salinity and waterlogging tolerances of Melaleuca ericifolia.
Australian Journal of Ecology
Morphological observation on development of juvenile seedlings of Monochoria vaginalis establishing on a flooded paddy soil surface.
Weed Biology and Management
A scanning electron microscopy study of the seed and post-seminal development in Angelonia salicariifolia Bonpl. (Scrophulariaceae).
Annals of Botany
Role of hypocotyl hairs in seedling establishment of wildflowers for landscaping.
Germination characteristics of lakeshore plants under an artificially stabilized water regime.
Parks Victoria (1997) ‘Lake Wellington wetlands draft management plan.’ (Parks Victoria: Melbourne)
Injury by soaking of Populus alba seeds.
Rehabilitation of swamp paperbark (Melaleuca ericifolia) wetlands in south-eastern Australia: effects of hydrology, microtopography, plant age and planting technique on the success of community-based revegetation trials.
Wetlands Ecology and Management
Effects of salinity on the decay of the freshwater macrophyte, Triglochin procera.
Germination characteristics of Melaleuca ericifolia Sm. (swamp paperbark) and their implications for the rehabilitation of coastal wetlands.
Marine and Freshwater Research
Developmental morphology of new world Podostemaceae: Marathrum and Vanroyenella.
International Journal of Plant Sciences
Interactive effects of salinity and water depth on the growth of seedling swamp paperbark (Melaleuca ericifolia Sm).
Importance of hypocotyl hairs in germination of Artemisia seeds.
Journal of Range Management
(2005) ‘Biostatistical analysis.’ (Prentice Hall: Englewood Cliffs, NJ)