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Molecular Events Underlying Coordinated Hormone Action in Submergence Escape Response of Deepwater Rice

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Abstract

Recent studies revealed that some rice varieties adopt opposite strategies to overcome flooding stress. While certain varieties hold metabolism and stay stunted until floodwater recedes, deepwater rice varieties undergo rapid stem elongation and do not suffer drowning problems. Both varieties use the same signaling agents, the ethylene response factors, as key factors even though they display opposite submergence responses. In deepwater rice, ethylene response factor genes SNORKEL1 and SNORKEL2 are believed to play a major role in submergence escape by mediating ethylene signaling, which leads to rapid stem elongation. These genes connect hormone signaling cascades from ethylene to ABA and gibberellins (GAs). Submergence increases ethylene levels in the internodal space, ethylene upregulates an ABA inactivating enzyme gene, OsCYP707A5 or OsABA8ox1, and some GA metabolism genes such as OsGA20ox genes and OsGA3ox genes. As a result of gene regulation by ethylene, internodal ABA levels decrease while GA levels increase, finally upregulating growth-related genes like expansin genes (OsEXPs). Along with the ethylene signaling in submergence, it is necessary to consider an alternative signaling pathway induced by hypoxia. Taken together, study on the submergence responses of rice plants will lead to improvement of crop production and contribution to basic research on plant growth.

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Acknowledgment

This work was supported by a grant from the National Research Foundation of Korea (Code No. 2009–0072994) funded by the Korea government (MEST).

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  1. Department of Biological Science, Kunsan National University, Gunsan, 573-701, Korea

    Dongsu Choi

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Choi, D. Molecular Events Underlying Coordinated Hormone Action in Submergence Escape Response of Deepwater Rice. J. Plant Biol. 54, 365–372 (2011). https://doi.org/10.1007/s12374-011-9182-7

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