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Abstract Detail

Environmental Physiology

Kordyum, E. [1], Kozeko, L. [1], Ovcharenko, Yu. [1].

Root structure and ADH expression plasticity of aerial-aquatic plants in response to different water environment.

Genome ability to change its expression and be realized in different phenotypes in response to various environmental influences is a fundamental property of all living organisms and is known as phenotypic plasticity due to organisms adjust to time and spatial environmental variations. It is known that water accessibility for plants is a critical external factor in plant growth and development. We studied the root structure and ADH expression in Alisma plantago-aquatica L. and Sium latifolium L. which are aerial-aquatic but can grow on the riverside, i.e. in the conditions of soil moderate water deficit for them. Hand-made sections about 10 µm of thickness were stained with toluidine blue. Cytochemical ADH staining in roots and native 6% PAG following by staining for ADH activity in gels were also carried out. The characteristic feature of roots in investigated aerial-aquatic plants is the presence of aerenchyma large intercellular spaces, which with those in stems and leaves provide root apices with oxygen. In the terrestrial plants, intercellular spaces in the root cortex are very small, and for S. latifolium, root secondary growth is inherent unlike "aquatic" plants. The enzymatic activity was revealed only in the root apices of aerial-aquatic plants as well as 2 isozymes in A. plantago-aquatica and 4 isozymes in S. latifolium roots indicating hypoxia state. In cases of increased soil humidity due to long raining season or river drainage regulation, adventitious roots with typical aerenchyma developed in terrestrial plants that was accompanied with the ADH activity appearance. The obtained data show a signal role of the water regime in development of adaptive reactions for the formation and functioning of root systems.

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1 - Institute of Botany, National Academy of Sciences of Ukraine, Department of Cell Biology and Anatomy, Tereshchenkivska str. 2, Kyiv, 01004, Ukraine

Water relations
phenotypic plasticity
root development
alcohol dehydrogenase.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P01002
Abstract ID:137

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