Yield and yield components responses of old and new soybean cultivars to source-sink manipulation under light enrichment
2006
Liu, X.(Chinese Academy of Sciences, Harbin (China). Northeast Inst. of Geography and Agroecology) E-mail:[email protected] | Herbert, S.J.(University of Massachusetts, Amherst (USA). Dept. of Plant, Soil and Insect Sciences) | Hashemi, A.M.(University of Massachusetts, Amherst (USA). Dept. of Plant, Soil and Insect Sciences) | Litchfield, G.V.(University of Massachusetts, Amherst (USA). Dept. of Plant, Soil and Insect Sciences) | Zhang, Q.(Chinese Academy of Sciences, Harbin (China). Northeast Inst. of Geography and Agroecology) | Barzegar, A.R.(University of Massachusetts, Amherst (USA). Dept. of Plant, Soil and Insect Sciences)
The aim of this study was to compare the differential response of yield components of two old and two new soybean cultivars to the assimilate availability at an early reproductive stage of growth under light enriched conditions. The yield sensitivity was much greater in old than in new cultivars. The yield of the new cultivars was more likely sink-limited, whereas it was source-limited for the old cultivars. The increased yield by light enrichment was in part due to an increased branch contribution. Pod number per plant was more responsive than seed number per pod. The reduction in pod number by source-sink manipulation was more severe in the old cultivars. Light enrichment increased pod number only in the two old cultivars. Seed size was responsive to changes in the source-sink ratio and changes in the environment. Both pod number or seed size may be increased or decreased if environmental conditions for seed filling are altered.
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