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Plant and Cell Physiology, 1985, Vol. 26, No. 8 1573-1581
© 1985

Article

Ethylene-Enhanced Transport of 14C-Labeled Metabolites in Rice Seedlings in Relation to Ethylene-Stimulated Coleoptile Growth

Kimiharu Ishizawa and Yohji Esashi

Department of Biological Science, Tohoku University Kawauchi, Sendai 980, Japan

To examine the effects of ethylene on sugar transport from endosperms to coleoptiles in rice (Oryza sativa L. cv. Sasanishiki) seedlings, the contents of free sugars in the coleoptiles of explants fed cold glucose and the distributions of 14C-activities after feeding of 14C-glucose to the scutella were determined at various times after ethylene application. Changes in sucrose, glucose and fructose in the cold glucose-fed explants exposed to ethylene were similar to those in the ethylene-treated intact seedlings having endosperms. Ethylene enhanced the transport of 14C-labeled metabolites from the scutella to the coleoptiles. Most of the 14C accumulated in the ethylene-treated coleoptiles were present as neutral substances in the ethanol-soluble fraction. Regardless of the presence or absence of ethylene, the incorporation of 14C into sucrose preceded that into glucose and fructose. The glucose and fructose moieties of 14C-sucrose in the coleoptiles were almost equally labeled, and the specific activities of 14C-sucrose were higher than those of 14C-glucose and 14C-fructose. These results suggested that sucrose synthesized in the scutella was exported to the coleoptiles, and cleaved there into glucose and fructose. Ethylene may accelerate the transport of 14C-labeled metabolites by activating sucrose cleavage in the coleoptiles.

(Received July 1, 1985; Accepted September 17, 1985)
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