Effect of phenolic acid application on gibberellin-induced internodal elongation in floating rice
2005
Azuma, T.(Kobe Univ. (Japan)) | Okita, N. | Nanmori, T. | Yasuda, T.
Internodes of floating rice (Oryza sativa L) elongate rapidly when treated with gibberellic acid (GA3). When Rho-coumaric or ferulic acid was applied to floating rice stem segments that had been induced to elongate rapidly by treatment with GA3, the extent of internodal elongation decreased in a dose-dependent manner; in particular, ferulic acid was more effective. Application Rho-coumaric or ferulic acid also increased the contents of Rho-coumaric, ferulic and 5-5-diferulic acids in the cell walls of the internodal elongation zone. In these stem segments, the content of ferulic or 5-5-diferulic acid showed a higher correlation with the decrease in internodal elongation compared with the content of Rho-coumaric acid. These facts suggest that the deposition of ferulic and 5.5-diferulic acids in cell walls is one of the causes of the reduction of internodal elongation in floating rice.
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