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- W43832064 abstract "Submergence induces rapid elongation of rice coleoptiles (Oryza sativa, L.) and of deepwater rice intemodes. This adaptive feature helps rice to grow out of the water and to survive flooding. The growth response of submerged deepwater rice plants is mediated by ethylene and gibberellin (GA). Ethylene promotes growth, at least in part, by increasing the responsiveness of the intemodal tissue to GA. We examined the possibility that increased responsiveness to GA was based on a reduction in endogenous abscisic acid (ABA) levels. Submergence and treatment with ethylene led, within 3 h, to a 75% reduction in the level of ABA in the intercalary meristem and the growing zone of deepwater rice intemodes. Our results indicate that the growth rate of deepwater rice intemodes is determined by the ratio of an endogenous growth promoter (GA) and a growth inhibitor (ABA). The growth response in deepwater rice intemodes is based on an increased cell production rate in the intercalary meristem and on increased cell elongation. Our investigations were aimed at establishing the temporal sequence of these GA-regulated processes. Treatment with GA promoted cell elongation in the intercalary meristem within 2 h. After 4 h of treatment with GA, the fraction of meristematic cells in the G2 phase had declined, indicating that cells in the G2 phase had entered mitosis. Subsequent activation of DNA replication led to an overall increase in the cell production rate. An increase in the final cell length contributed to the growth response after 7 h of GA application. Our results are consistent with the hypothesis that GA promotes first cell elongation in the intercalary meristem and that cell division is stimulated as a result of cell growth.KeywordsCell ElongationMeristematic CellInternodal ElongationDeepwater RiceRice ColeoptileThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves." @default.
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- W43832064 date "1993-01-01" @default.
- W43832064 modified "2023-09-27" @default.
- W43832064 title "The Role of Ethylene in Regulating Growth of Deepwater Rice" @default.
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- W43832064 doi "https://doi.org/10.1007/978-94-017-1003-9_75" @default.
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