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한국식물학회 / v.42, no.1, 1999년, pp.1-7 
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( Inhibition of Auxin-Induced Ethylene Production by Salicylic Acid in Mung Bean Hypocotyls ) |
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| 초 록 |
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| Salicylic acid (SA), a common plant phenolic compound, influences diverse physiological and biochemical processes in plants. To gain insight into the mode of interaction between auxin, ethylene, and SA, the effect of SA on auxininduced ethylene production in mung bean hypocotyls was investigated. Auxin markedly induced ethylene production, while SA inhibited the auxin-induced ethylene synthesis in a dose-dependent manner. At 1 mM of SA, auxininduced ethylene production decreased more than 60% in hypocotyls. Results showed that the accumulation of ACC was not affected by SA during the entire period of auxin treatment, indicating that the inhibition of auxin-induced ethylene production by SA was not due to the decrease in ACC synthase activity, the rate-limiting step for ethylene biosynthesis. By contrast, SA effectively reduced not only the basal level of ACC oxidase activity but also the woundand ethylene-induced ACC oxidase activity, the last step of ethylene production, in a dose-dependent manner. Northern and immuno blot analyses indicate that SA does not exert any inhibitory effect on the ACC oxidase gene expression, whereas it effectively inhibits both the in vivo and in vitro ACC oxidase enzyme activity, thereby abolishing auxin-induced ethylene production in mung bean hypocotyl tissue. It appears that SA inhibits ACC oxidase enzyme activity through the reversible interaction with Fe2+, an essential cofactor of this enzyme. These results are consistent with the notion that ethylene production is controllled by an intimate regulatory interaction between auxin and SA in mung bean hypocotyl tissue. |
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| 키워드 |
| ACC oxidase;auxin;ethylene;mung bean hypocotyls;salicylic acid;Vigna radiata; |
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Journal of Plant Biology / v.42, no.1, 1999년, pp.1-7
한국식물학회
ISSN : 1226-9239
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO199911920120650)
언어 : 영어 |
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| 논문 제공 : KISTI 한국과학기술정보연구원 |
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