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Two wheat cultivars, Hesheng 2 with large grain yield potential, and Shannong 505 with small grain yield potential, were used for investigating the responses of postanthesis photosynthesis, dry matter accumulation and allocation, and grain growth to source/sink changes. At the initial grain filling stage, Hesheng 2 was sensitive to source reduction leading to an increase of net photosynthetic rate...
Source-sink relationship, which was influenced by both genotype and environmental factors, contributed to the variation in photosynthesis and photosynthate partitioning of wheat. Source reduction by partial defoliation increased leaf net photosynthetic rate (PN), and sink reduction decreased PN of irrigated wheat. However, the change in PN varied among genotypes. Source reduction enhanced photosynthate...
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