Photosynthetica 2006, 44(2):312-315 | DOI: 10.1007/s11099-006-0024-7

Effects of water stress and high temperature on gas exchange and chlorophyll fluorescence in Triticum aestivum L.

I. A. Hassan1
1 Department of Botany, Faculty of Science, Alexandria University, Alexandria, Egypt

Wheat plants grown in controlled growth chambers were exposed to drought stress (DS) and high temperature (HT) singly and in combination (DS+HT). The effects of these two stresses on net photosynthetic rate (P N), stomatal conductance (g s), intercellular CO2 concentration (C i), quantum efficiency of photosystem 2 (ΦPS2), variable to maximum chlorophyll (Chl) fluorescence (Fv/Fm), photochemical (qp) and non-photochemical (NPQ) Chl fluorescence, and yield were investigated. Grain yield was decreased by 21 % due to DS, while it was increased by 26 % due to HT. P N, g s, C i, and Chl fluorescence were dramatically reduced to DS, HT, and their interaction, except NPQ which showed an increase due to HT.

Additional key words: grain yield; intercellular CO2 concentration; quantum efficiency of photosystem 2; spikelet; stomatal conductance; yield

Received: July 25, 2005; Accepted: October 24, 2005; Published: June 1, 2006  Show citation

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Hassan, I.A. (2006). Effects of water stress and high temperature on gas exchange and chlorophyll fluorescence in Triticum aestivum L. Photosynthetica, 44(2), 312-315. doi: 10.1007/s11099-006-0024-7
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