Photosynthetica 2004, 42(1):99-104 | DOI: 10.1023/B:PHOT.0000040576.52128.ed

Contribution of Pre-Anthesis Assimilates and Current Photosynthesis to Grain Yield, and their Relationships to Drought Resistance in Wheat Cultivars Grown Under Different Soil Moisture

T. Inoue1, S. Inanaga1, Y. Sugimoto2, K. El Siddig3
1 Arid Land Research Center, Tottori University, Tottori, Japan
2 Department of Biofunctional Chemistry, Faculty of Agriculture, Kobe University, Kobe, Japan
3 Agricultural Research Corporation, Wad Medani, Sudan

We investigated the relative importance of pre-anthesis assimilates stored in plant parts, mainly in the stem, and post-anthesis photosynthesis to drought resistance in wheat (Triticum aestivum L.) cultivars Hongwangmai (drought resistant) and Haruhikari (drought sensitive) subjected to two soil moisture regimes: irrigated and non-irrigated. In the irrigated treatment, soil moisture was maintained near field capacity throughout the growing season, while in the non-irrigated treatment water was withheld from 81 d after sowing until maturity. Drought stress reduced grain yield of Hongwangmai and Haruhikari by 41 and 60 %, respectively. Remobilization of pre-anthesis assimilates to the grain (remobilization) was reduced by drought in Hongwangmai but increased in Haruhikari. The contribution of pre-anthesis assimilates to the grain decreased under non-irrigated treatment in Hongwangmai. However, under water stress, Hongwangmai maintained a higher net photosynthetic rate in the flag leaf than Haruhikari. These results indicated that maintenance of post-anthesis photosynthetic rate was related to drought resistance in Hongwangmai rather than to remobilization under drought stress.

Additional key words: cultivar differences; intercellular CO2 concentration; net photosynthetic rate; remobilization; stomatal conductance; Triticum aestivum; water stress

Published: March 1, 2004  Show citation

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Inoue, T., Inanaga, S., Sugimoto, Y., & El Siddig, K. (2004). Contribution of Pre-Anthesis Assimilates and Current Photosynthesis to Grain Yield, and their Relationships to Drought Resistance in Wheat Cultivars Grown Under Different Soil Moisture. Photosynthetica, 42(1), 99-104. doi: 10.1023/B:PHOT.0000040576.52128.ed
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