Photosynthesis, root respiration, and grain yield of spring wheat in response to surface soil drying

被引:21
作者
Liu, HS
Li, FM [1 ]
机构
[1] Lanzhou Univ, State Key Lab Arid Agroecol, Lanzhou 730000, Peoples R China
[2] Chinese Acad Sci, Inst Bot, Lab Quantitat Vegetat Ecol, Beijing 100093, Peoples R China
[3] Chinese Acad Sci, Inst Soil Eros & Water Conservat, State Key Lab Soil Eros & Dryland Farming, Yangling 712100, Shanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
carbohydrate allocation; drought stress; harvest index; root/shoot ratio; water use efficiency;
D O I
10.1007/s10725-004-7864-6
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The aims of this research were to test the influence of surface soil drying on photosynthesis, root respiration and grain yield of spring wheat ( Triticum aestivum), and to evaluate the relationship between root respiration and grain yield. Wheat plants were grown in PVC tubes 120 cm in length and 10 cm in diameter. Three water regimes were employed: ( a) all soil layers were irrigated close to field water capacity (CK); (b) upper soil layers (0-40 cm from top) drying (UD); ( c) lower soil layer (80-120 cm from top) wet ( LW). The results showed that although upper drying treatment maintained the highest root biomass, root respiration and photosynthesis rates at anthesis, the root respiration of the former was significantly (P<0.05) lower than the latter at the jointing stage. There were no differences in water use efficiency or harvest index between plants from the upper drying and well-watered treatment. However, the grain weight for plants in the upper drying treatment was significantly (P<0.05) higher than that of in well-watered control. The results suggest that reduced root respiration rate and the amount of photosynthates utilized by root respiration in early season growth may also have contributed to improve crop production under soil drying. Reduced root activity and root respiration rate, in the early growth stage, not only increased the photosynthate use efficiency ( root respiration rate: photosynthesis ratio), but also grain yield. Rooting into a deeper wet soil pro. le before grain filling was crucial for spring wheat to achieve a successful seedling establishment and high grain yield.
引用
收藏
页码:149 / 154
页数:6
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