Photosynthetica, 2004 (vol. 42), issue 4

Photosynthetica 2004, 42(4):559-565 | DOI: 10.1007/S11099-005-0013-2

Effect of drought on ear and flag leaf photosynthesis of two wheat cultivars differing in drought resistance

T. Inoue1, S. Inanaga1, Y. Sugimoto2, P. An1, A. E. Eneji1
1 Arid Land Research Center, Tottori University, Tottori, Japan
2 Department of Biofunctional Chemistry, Faculty of Agriculture, Kobe University, Kobe, Japan

We investigated net photosynthetic rate (PN) of ear and two uppermost (flag and penultimate) leaves of wheat cultivars Hongmangmai (drought resistant) and Haruhikari (drought sensitive) during post-anthesis under irrigated and non-irrigated field conditions. The PNof ear and flag leaf were significantly higher and less affected by drought in Hongmangmai than in Haruhikari. The rate of reduction in stomatal conductance (gs) was similar for the two cultivars, but intercellular CO2concentration (Ci) in the flag leaf of Hongmangmai was lower than that of Haruhikari in non-irrigated treatment. No differences were observed in leaf water potential (ψ1) and osmotic adjustment of the flag leaf of the cultivars. These results imply that differences in photosynthetic inhibition on the flag leaf at low leaf ψ1between the cultivars were primarily due to non-stomatal effects. Hence the main physiological factor associated with yield stability of Hongmangmai under drought stress may be attributed to the capacity for chloroplast activity in the flag leaf, which apparently allows sustained PNof flag leaf during grain filling under drought stress. The higher PNof ear in Hongmangmai under drought could also be related to its drought resistance.

Keywords: cultivar differences; diurnal change; intercellular CO2 concentration; net photosynthetic rate; stomatal conductance; Triticum aestivum; water stress

Received: April 13, 2004; Accepted: June 9, 2004; Published: December 1, 2004Show citation

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Inoue, T., Inanaga, S., Sugimoto, Y., An, P., & Eneji, A.E. (2004). Effect of drought on ear and flag leaf photosynthesis of two wheat cultivars differing in drought resistance. Photosynthetica, 42(4), 559-565. doi: 10.1007/S11099-005-0013-2.
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