biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 53:237-242, 2009 | DOI: 10.1007/s10535-009-0045-8

Growth, lipid peroxidation and photosynthesis in two tall fescue cultivars differing in heat tolerance

J. Z. Wang1,2, L. J. Cui3, Y. Wang1, J. L. Li1,*
1 School of Life Sciences, Nanjing University, Nanjing, P.R. China
2 Landscape Department, Lishui University, Zhejiang, P.R. China
3 School of Life Sciences, Shanxi Normal University, Xi'an, P.R. China

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.

Keywords: chlorophyll fluorescence; Festuca arundinacea; high temperature stress; carboxylation efficiency; stomatal conductance
Subjects: carboxylation efficiency; chlorophyll a,b; chlorophyll fluorescence; CO2 concentration, internal; electrolyte leakage; fescue; Festuca arundinacea; growth and growth analysis; heat stress, high temperature; malondialdehyde; photosynthetic rate; quantum yield; stomatal conductance; stomatal limitation; temperature, high

Received: May 16, 2007; Accepted: December 21, 2007; Published: June 1, 2009  Show citation

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Wang, J.Z., Cui, L.J., Wang, Y., & Li, J.L. (2009). Growth, lipid peroxidation and photosynthesis in two tall fescue cultivars differing in heat tolerance. Biologia plantarum, 53(2), 237-242. doi: 10.1007/s10535-009-0045-8
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