Studies on source-sink relationships in sweet potato (Ipomoea batatas Lam.)
1991
Zong Ruishou (Xuzhou Sweet Potato Research Center, Jiangsu (China))
Four sweet potato varieties of different growth patterns were grafted reciprocally in 1989. The seedlings of 16 grafting combinations were transplanted in a field trial of randomized complete splitplot design. The per plot root yields, fresh and dry, underwent analysis of variance. The stock and scion in a grafted seedling were regarded as the photosynthesis source and storage sink, respectively, and the influence of their characteristics on the root yield was studied. The results showed that the characteristics of both source and sink could greatly influence the root yield, but the yield was primarily determined by the sink capacity rather than the source potential. The sink capacity of high yielders seemed to have enhanced the poor source potential of low yielders and significantly raised the root yield of the latter. The dry matter content in root and the root flesh color of the grafted seedling were similar to those of the stock, and not influenced by the photosynthesis source
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