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Red light induced production of gibberellin-like substances in homogenates of etiolated wheat leaves and in suspensions of intact etioplasts

✍ Scribed by R. J. Cooke; P. F. Saunders; R. E. Kendrick

Publisher: Springer-Verlag
Year: 1975
Tongue: English
Weight: 789 KB
Volume: 124
Category: Article
ISSN: 0032-0935
DOI: 10.1007/bf00388695

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✦ Synopsis

Homogenates of etiolated wheat leaves contain increased levels of acidic gibberellin (GA)-like substances following treatment with red light. Differential centrifugation of homogenates indicates that the response is confined to the 1000 g (or plastid) fraction. Irradiation of suspensions of intact etioplasts also increases the level of extractable GA-like activity. Phytochrome can be detected spectrophotometrically in preparations of etioplasts. The response in etioplasts can be inhibited by chloramphenicol, but not by cycloheximide, and partially by Amo 1618. The GA-like substances produced in etioplasts seem capable of passing into the surrounding medium within 20 min.

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