By the methods of seeds germination in the different concentrations of saccharose, measuring of water potential and induction of chlorophyll fluorescence of leaves in field conditions comparative research of influence of water deficit on drought tolerance of cotton varieties was conducted. It is shown that in the conditions of insufficient water supply indices of germination of seeds, water potential and parameters of induction of chlorophyll fluorescence of leaves of all varieties decreased, however the degree of change of indices differs among varieties. In accordance with the obtained data, all varieties allocated to three groups: drought-resisting, with the lowered resistance to a drought and non-resistant to the drought. Accordance of changes of induction curves of chlorophyll fluorescence of leaves and indices of the water status of cotton plants was revealed, that specifies on perspective of the use of the method of induction of chlorophyll fluorescence for diagnostics of drought tolerance of cotton plant genotypes.
Keywords: Gossypium hirsutum L., cotton, drought tolerance, water potential, induction of chlorophyll fluorescence
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