Growth,lipid peroxidation and photosynthesis in two tall fescue cultivars differing in heat tolerance |
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| Authors: | J. Z. Wang L. J. Cui Y. Wang J. L. Li |
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| Affiliation: | (1) School of Life Sciences, Nanjing University, Nanjing, 210093, P.R. China;(2) Landscape Department, Lishui University, Zhejiang, 323000, P.R. China;(3) School of Life Sciences, Shanxi Normal University, Xi’an, 710062, P.R. China |
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| Abstract: | Seedlings (70-d-old) of two tall fescue (Festuca arundinacea Schreb.) genotypes, heat-tolerant Jaguar 3 and heat-sensitive TF 66, were exposed to a high temperature stress of 35/30 °C (day/night) for 20 d and both light-saturated and CO2-saturated 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 plants, 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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| Keywords: | KeywordHeading" >Additional chlorophyll fluorescence Festuca arundinacea high temperature stress carboxylation efficiency stomatal conductance |
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