Liečivé rastliny v meniacich sa environmentálnych podmienkach

Vliv abiotických a biotických stresorů na vlastnosti rostlin 11.5.2005
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Assessment of sensitivity of wheat genotypes photosynthetic
apparatus to water stress
Key words: chlorophyll a fluorescence – drought stress – wheat
Summary
Breeding for drought tolerance is still very difficult. The possible way is application of appropriate
physiological selection traits and techniques. Therefore it is necessary to identify differences
between susceptible and tolerant genotypes using fast and reliable methods. In high producing
genotypes of winter wheat we evaluated their sensitivity to water deficit in leaves using technique
of rapid chlorophyll fluorescence measurement and data analysis by JIP-test. Water status in leaves
was measured as relative water content and water potential. Wheat cultivars showed different
reactions to water deficit Each variety showed typical correlation between water potential or RWC
and selected parameters of chlorophyll fluorescence. These relationships could be potentially used
as a good selective trait for drought toleranc
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