Growth, lipid peroxidation and photosynthesis in two tall fescue cultivars differing in heat tolerance
2009
Wang, J.Z.,Nanjing Univ. (China). School of Life Sciences | Cui, L.J.,Shanxi Normal Univ., Xi'an (China). School of Life Sciences | Wang, Y.,Nanjing Univ. (China). School of Life Sciences | Li, J.L.,Nanjing Univ. (China). School of Life Sciences
Seedlings (70-d-old) of two tall fescue (Festuca arundinacea) genotypes, heat-tolerant Jaguar 3 and heat-sensitive TF 66, were exposed to a high temperature stress of 35/30 deg C (day/night) for 20 d. In both light-saturated and CO2-saturated plants leaf stomatal conductance decreased, especially in TF 66. Higher reductions of quantum efficiency, carboxylation efficiency and maximum photochemical efficiency of photosystem 2 in dark adapted leaves (measured as Fv/Fm) occurred in TF 66 than in Jaguar 3. High temperature stress increased photorespiration in the two genotypes, but more in TF 66. Moreover, high temperature stress also reduced the growth, chlorophyll content and caused cell membrane injuries in the two cultivars, the changes were again more pronounced in TF 66 than in Jaguar 3.
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