Relation between Sex Expression Types and Cotyledon Etiolation of Cucumber in vitro I. On the Role of Ethylene Evolved from Seedlings

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Cucumber seedlings, when cultured in vitro, showed differences in cotyledon etiolation rates among cultivars with different genetic backgrounds for sex expression. The chlorophyll content in gynoecious cultivars (acr^F/acr^F) decreased rapidly while that in monoecious ones (acr^+/acr^+) decreased more slowly, and that in mono-gynoecious ones (acr^1/acr^1) decreased at an intermediate rate. Etiolation was suppressed even in early-etiolating cultivars when the flask remained unsealed or endogenously evolved ethylene was removed. Cotyledon etiolation was enhanced even in late-etiolating cultivars when ethephon was added to the flask. The rate of etiolation corresponded to the ethylene concentration in the flask; much more ethylene was detected in early-etiolating cultivars than in late-etiolating ones. Ethylene accumulation is one of the important factors involved in the cotyledon etiolation observed in in vitro cultures. The difference in etiolation rates among seedlings with different genetic backgrounds for sex expression corresponds to their ability for ethylene evolution, in the order of acr^F > acr^1 > acr^+.
日本植物生理学会の論文