Ethylene-Enhanced Transport of Uranine, a Fluorescent Dye, in Rice-Seedling Explants in Relation to Ethylene-Stimulated Coleoptile Growth
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概要
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Ethylene enhanced the transport of uranine, a fluorescent dye, through the coleoptiles of rice (Oryza sativa L. cv. Sasanishiki) seedlings explants after a 2-h lag period. The uranine transport increased with increasing concentration of ethylene, reaching a maximum at 1 μl・liter^<-1> ethylene. It decreased when some metabolic inhibitors, 2,4-dinitrophenol, carbonyl cyanide 3-chlorophenylhydrazone and N-ethylmaleimide, were applied to the scutella. Mechanical rupture or heating at the vascular-bundle sides of the coleoptiles also interfered with the ethylene-enhanced transport of uranine. The wounding and removal of the scutella similarly blocked uranine transport. More-over, strong fluorescence of uranine was observed on the phloem regions of two vascular bundles of a coleoptile under a fluorescence microscope. It is suggested that the ethylene-enhanced transport of uranine in the coleoptile of rice-seedling explants occurs through the phloem. On the other hand, the removal of the endosperm or the rupture of the vascular bundles inhibited the ethylene-stimulated elongation of the rice coleoptiles. Moreover, ethylene increased dry weight of the shoots. These results suggest that the ethylene-stimulated elongation of rice coleoptiles was supported partly by the ethylene-enhanced translocation of materials from the endosperms to the coleoptiles.
- 日本植物生理学会の論文
著者
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Esashi Yohji
Department Of Biological Science Tohoku University
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Ishizawa K
Biological Institute Graduate School Of Science Tohoku University
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Ishizawa Kimiharu
Department Of Biological Science Tohoku University
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