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KMID : 0903620000410030257
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Journal of the Korean Society for Horticultural Science
2000 Volume.41 No. 3 p.257 ~ p.260
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Characteristics of Translocation and Distribution of Photo - assimilates in Leaves at Different Nodes in Watermelon
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이상규/Lee, Sang Gyu
고관달/이용범/성기철/강기경/Ko, Kwan Dal/Lee, Yong Beom/Seong, Ki Cheol/Kang, Ky Kyung
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Abstract
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The purpose of this study was to investigate the characteristics of translocation and distribution of photo-assimilates at different leaves in watermelon (Citrullus vulgaris Schrad. cv. Dalgona). Upper leaves at fruiting node showed higher photosynthetic rates than lower leaves. Leaves of non-fruiting node stems also showed a high rate of photosynthesis. Fruits were the strongest sink, having highest distribution rate of ^(14)CO₂. Particularly, in the non-topping treatment, the second lower leaf from fruiting node was hightest ^(14)CO₂ distribution rate to fruit. Higher distribution of ^(14)CO₂ to the upper stems was observed on the non-topping leaves than topping leaves. In the non-topping treatment, meristem was the second strongest sink. Sugar contents according to defoliation were not significantly different among treatments. Yellow belt index of fruit appeared when the upper leaves of fruit set node were defoliated but did not appear when the lower leaves of fruit set node were defoliated.
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