Poster: Ecophysiology
Abs #
41: Genetic variability and root deployment responses to moisture environment in aerial-aquatic plants
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Presenter: |
Kordyum, Elizabeth , cell@svitonline.com |
Authors | Kordyum, Elizabeth (A) Kozeko, Lyudmyla (A) Ovcharenko, Yulia (A) | | Affiliations: |
(A): Institute of Botany, NASU
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The adaptive morphological and physiological differences between species and populations that grow in waterlogged and free-drained soils have been shown in many studies. This paper reports the influence of moderate water deficit on Sium latifolium L.(Apiaceae) and Alisma plantago-aquatica L.(Alismataceae) which are aerial-aquatic plants on their ecology and widely distributed in Ukraine over a range of habitats - continuous flooded, transient flooded and free-drained soils. Plants of populations growing on the riverside expressed significant changes in morphophysiological traits in comparison with flooded ones, especially in the production and structure of root systems. The most part of a root system in flooded plants consists of adventive roots with well developed aerenchyma. In terrestrial plants, aerenchyma was absent. By changing the soil environment in relation to waterlogging for flooded and terrestrial plants, a signal role of water regime in the production and structure of root systems in hidrophilous aerial-aquatic plants have been clearly shown that provides their distribution and fertility in the habitats with a different degree of waterlogging. Comparative characterisation of terrestrial and aerial-aquatic plants by molecular-genetic markers was carried out on S. latifolium using two enzymatic systems – peroxidase and esterase. The results of an isozyme analysis indicate stable differences between these groups of plants on seven isoperoxidases and three isoesterases in leaves and three isoperoxidases and three isoesterases in mericarps. The possibility of involvment of phenotypic plasticity by differential gene expression and genetic polymorphism in the ability of these species to colonize a range of environments is discussed.
