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한국식물학회 / v.50, no.5, 2007년, pp.595-599 
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( Ethylene-induced Stem Growth of Deepwater Rice Is Correlated with Expression of Gibberellin- and Abscisic Acid-biosynthetic Genes ) |
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| 초 록 |
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| Ethylene decreases the content of endogenous abscisic acid (ABA) and increases the level of bioactive gibberellin $A_1;(GA_1)$ in the submerged internodes of deepwater rice. During partial submergence, internodes of deepwater rice undergo rapid elongation as a result of ethylene accumulation in the internodal lacunae. In an in vitro experiment using stem sections from deepwater rice, treatment with $5;{mu}L;L^{-1}$ ethylene promoted stem growth by up to 3.2-fold times over air treatment. Expression patterns were analyzed for genes that encode GA- and ABA-biosynthesis enzymes to determine any possible molecular basis for the changes observed in $GA_1$ and ABA contents as a result of ethylene action. Expression of the OsGA20ox2 and OsGA20ox4 genes, which encode GA 20-oxidase, and of the OsGA3ox2 gene, which encodes the enzyme that converts $GA_{20};to;GA_1$, was up-regulated, whereas that of three ABA-biosynthetic genes -- OsNCED1, OsNCED2, and OsNCED5 -- was down-regulated in the presence of ethylene. These results indicate that GA and ABA contribute equally to the submergence- or ethylene-induced stem elongation of deepwater rice via the coordinated and opposite regulation of biosynthesis. |
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| 키워드 |
| abscisic acid;deepwater rice;ethylene;gibberellin;stem elongation; |
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Journal of Plant Biology / v.50, no.5, 2007년, pp.595-599
한국식물학회
ISSN : 1226-9239
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200703534302767)
언어 : 영어 |
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| 논문 제공 : KISTI 한국과학기술정보연구원 |
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