Adaptation potential of photosynthesis in wheat cultivars with a capability of leaf rolling under high temperature conditions |
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Authors: | G E Sarieva S S Kenzhebaeva H K Lichtenthaler |
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Institution: | (1) Department of Biology, Faculty of Sciences and Arts, Karadeniz Technical University, 61080 Trabzon, Turkey |
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Abstract: | For the first time, the adaptive role of the rolling leaf trait for tolerance of wheat plants (Triticum aestivum L.) to the main factor of drought, high temperature, was demonstrated. Cv. Otan with high degree of this trait expression
was more tolerant to temperature stress (40°C, 4 h during 2 days (2h/day)). Changes in parameters of chlorophyll fluorescence,
F
v/F
m and R
Fd690, suggest that cv. Otan was tolerant to inhibition of photochemical activities of photosystem II (PSII) and photosystem
I (PSI). Furthermore, high temperature had no effect on the rate of net photosynthesis (P
N) in cv. Otan, although it decreased this parameter in the other wheat cultivars. The main factors, which provid for this
tolerance, were adaptation of the photosynthetic pigment system by active accumulation of carotenoids, more stable structural
organization of PSII and PSI, and their high photosynthetic activities, as well as efficient stomatal regulation of transpiration
and supplying of mesophyll cells with CO2. It is hypothesized that the physiological role of the rolling leaf trait is the maintenance of adaptation potential by increasing
the efficiency of water metabolism in the flag leaves of wheat under high temperature. |
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Keywords: | |
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