39 日長とエチレンによるキュウリの花の性表現の制御

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Sex expression of cucumber plants is affected by the day length and a plant hormone, ethylene, Short-day conditions or the treatment with ethylene induce the femaleness whereas long-day conditions or the treatments with inhibitors of ethylene biosynthesis induce the maleness. In this study, we examined the correlation between the effects of day length and ethylene on sex expression of monoecious cucumber plants. The application of ethephone, an ethylene releasing agent, to the shoot apices of cucumber plants, when the leaf blade of the fourth leaf was approximately 2-cm long (defined as the 4-leaf stage), induced femaleness under the long-day (16h) condition. Also, the application of aminoethoxyvinyl glycine (AVG), an inhibitor of ethylene biosynthesis, to the shoot apices of cucumber plants at the 4-leaf stage induced maleness under the short-day (8h) condition. Ethephone treatment did not induce femalehess significantly under the short-day condition. Also, the cucumber plants grown under the short-day condition produced more ethylene than those grown under the long-day condition at the 4-leaf stage. Ethylene production from the shoot apices of cucumber plants and the expression of CS-ACS2 and CS-ERS showed circadian rhythm with a peak in the middle of the photoperiod. These results indicate that the femaleness of the cucumber flowers under the short-day condition mediate ethylene production. CS-ACS2 and CS-ERS genes may contribute to this ethylene signaling cascade in the femaleness of cucumber plants.
植物化学調節学会の論文
2001-10-09

39 日長とエチレンによるキュウリの花の性表現の制御

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