Abstract
Growth-promoting effects of gibberellins and their glucosides isolated from immature seeds of Japanese morning glory ( Pharbitis nil) were compared in six bioassay systems. GA 3 glucoside exhibited much less activity than GA 3 in the dwarf rice (under aseptic conditions), dwarf maize ( d 1, d 2 and d 5), cucumber and dwarf pea assays. GA 8, GA 26, GA 27 and GA 29 showed low activities in all the bioassay systems, while their glucosides were even less active. Thus gibberellin glucosides do not appear to be active in growth regulation.
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