Ethylene and Gibberellin: Regulation of Internodal Elongation and Nodal Root Development in Floating Rice |
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Authors: | Suge Hiroshi |
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Institution: | Institute for Agricultural Research, Tohoku University Katahira, Sendai 980, Japan |
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Abstract: | Ethylene and GA3 stimulated internodal elongation in the excisedstem sections of floating rice. The combined application ofethylene and GA3 exerted a cooperative effect on internodalelongation, although the effect was variety dependent. Stimulativeeffect of ethylene on internodal growth in intact floating riceplants was virtually absent when the plants were pre-treatedwith Ancymidol, -cyclopropyl- -(4-methoxyphenyl)-5-pyrimidinemethanol, an inhibitor of gibberellin biosynthesis. Submergenceof intact plants, which also induced internodal elongation,had no stimulative effect when the plants were pre-treated withAncymidol. Submergence of intact plants increased the endogenousgibberellin level. The internode of young, intact 9 day oldseedlings responded neither to submergence nor ethylene, butwhen seedlings were pre-treated with GA3 they responded to eitherone. Nodal root development was also enhanced by either ethyleneor GA3. Combined application of ethylene and GA3 exerted a co-operativeeffect on nodal root development. Ancymidol-treated plants didnot produce nodal roots even though they were subjected to submergence,whereas nontreated control plants produced nodal roots normally. (Received September 12, 1984; Accepted February 15, 1985) |
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