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Growth responses of Baumea juncea (Cyperaceae) plants from inland artesian spring and coastal habitats to salinity and waterlogging treatments

Citation

Gellie, N and Beaumont, K and Mackay, D and Whalen, M and Clarke, L, Growth responses of Baumea juncea (Cyperaceae) plants from inland artesian spring and coastal habitats to salinity and waterlogging treatments, Australian Journal of Botany, 63, (6) pp. 517-525. ISSN 0067-1924 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 CSIRO

DOI: doi:10.1071/BT15005

Abstract

Artesian springs of arid inland Australia provide permanent water that supports naturally fragmented wetland communities. Some plant species that occur at springs have more extensive populations in coastal wetland areas of Australia where they may experience quite different environmental conditions. The present study investigated the growth response of one such species, Baumea juncea (R.Br.) Palla (Cyperaceae), to salinity and waterlogging. Plants from each region were subjected to combinations of salinity (freshwater or 20% seawater) and waterlogging (unsaturated or saturated soil), in a factorial design, for a period of 5 months. All plants survived and although the final aboveground biomasses did not differ significantly among the treatment combinations, for spring plants, the relative growth of roots was greater in unsaturated soil than in saturated soil. For the growth parameters of total biomass, culm biomass and rhizome biomass, spring and coastal plants showed contrasting responses to the treatment combinations; for spring plants in fresh water, these parameters were greater in the saturated treatment than in the unsaturated treatment, whereas for spring plants in saline water, these variables were lower in the saturated treatment than in the unsaturated treatment. Coastal plants displayed the reverse pattern. For the remaining parameters of root biomass, root : culm ratio and aboveground : belowground biomass ratio, plants from spring and coastal regions grown under saline conditions displayed contrasting responses to waterlogging. Our findings showed that the growth responses of plants of B. juncea to waterlogging and salinity differ for spring and coastal plants, suggesting potential differential adaptation by populations in these disjunct and distinct environments.

Item Details

Item Type:Refereed Article
Keywords:artesian springs, salinity, waterlogging, disjunct, plant physiology, sedge
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Ecological Physiology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Sparseland, Permanent Grassland and Arid Zone Flora, Fauna and Biodiversity
Author:Clarke, L (Dr Laurence Clarke)
ID Code:103923
Year Published:2015
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2015-10-28
Last Modified:2017-11-02
Downloads:0

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