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Effect of Seeding Depth on Hypocotyl Growth, Hook Opening, and Sucrose Metabolism in Soybean  

Yun, Seung-Gil (Department of Plant Resources Science, Hankyong National University)
Lee, Sang-Gak (Department of Plant Resources Science, Hankyong National University)
Lee, Sang-Eun (Department of Plant Resources Science, Hankyong National University)
Park, So-Hyon (Department of Plant Resources Science, Hankyong National University)
Huh, Kwang-Woon (Department of Plant Resources Science, Hankyong National University)
Lim, Sun (Department of Plant Resources Science, Hankyong National University)
Kim, Tae-Wan (Department of Plant Resources Science, Hankyong National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.36, no.6, 2003 , pp. 429-436 More about this Journal
Abstract
The relationship between seeding depth and apical hook opening was investigated in the hypocotyl hook of soybean (Glycine max Merr., cv. Hwanggeum). Seeds were sawn in different depths (2.5, 5.0, 7.5, and 10.0 cm). The hook opening was slowly progressed with seeding depth. Hook angle opening velocity was negatively correlated with hypocotyl growth at the significant level of P<0.01. It was also clearly observed that seeding depth was positively correlated with hypocotyl growth, suggesting the induction of hypocotyl growth by deep sawing. Futhermore, the contents of fructose and glucose in hypocotyls were about higher than in cotyledons. Both sugars in hypocotyls were highest at the emergence stage. After emergence, their levels were obviously reduced. Total soluble sugar contents continuously retained in cotyledons which were grown at 2.5 and 5.0 cm seeding depths whereas the contents in cotyledons of deep sawn soybean were extremely lowered. It seemed that sugars were actively used to cell construction during the hypocotyl elongation. The results demonstrated that apical hook opening is closely related with light signal after emergence. It implied that the delay of hook opening in deep sawn seeds was resulted from hypocotyl growth in darkness. We suggest that apical hook opening is progressed in sucrose catabolism by light.
Keywords
Hook opening; Hypocotyl; Seeding depth; Soybean; Sucrose;
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