Effects of Ethylene and Gibberellins on the Elongation of Rice Seedlings (Oryza sativa L.)
Furukawa, Koji | Yang, Young-Yell | Honda, Ichiro | Yanagisawa, Tadashi | Sakurai, Akira | Takahashi, Nobutaka | Kamiya, Yūji
Three-day-old rice seedlings treated with ethylene showed elongation of the 2nd and 3rd leaves. This ethylene-stimulated elongation was not observed in the presence of uniconazole-P or prohexadione, both gibberellin (GA) biosynthesis inhibitors, suggesting that GA was involved in the response. An analysis of endogenous GAs by GC-MS revealed that the GA₁ level was reduced in the 3rd leaf in response to ethylene. Dose-response experiments showed that the responsiveness to GA₁ was enhanced by ethylene. Feeding experiments of ¹⁴C-GA₁ with ethylene-treated seedlings showed that ethylene may increase the conversion of GA₁ to GA₈. These results suggest that, in young seedlings of rice, ethylene stimulates leaf elongation by increasing the responsiveness to GA₁ and the turnover of GA₁.
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