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

Autor: Shinobu Inanaga, Yukihiro Sugimoto, K. El Siddig, T. Inoue
Rok vydání: 2004
Předmět:
Zdroj: Photosynthetica. 42:99-104
ISSN: 1573-9058
0300-3604
DOI: 10.1023/b:phot.0000040576.52128.ed
Popis: 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.
Databáze: OpenAIRE
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