Activity of gibberellin A₁₇ in 13 bioassay systems

Abstract

The activity of gibberellin A17 (GA17) was relatively low in the bioassay systems in which it was tested. The dock leaf senescence assay was the most sensitive of those used, followed by the oat mesocotyl, dwarf rice, and barley half-seed assays. In the cucumber hypocotyl, lettuce hypocotyl, excised pea epicotyl, oat leaf, and d-1 maize mutants, the activity of GA17 was only marginal. In the intact dwarf pea, d-2, d-3, and d-5 maize mutant assays no activity was recorded.

Effects of different gibberellins on elongation growth under short day conditions in seedlings of Salix pentandra

“…Also the relative activity of GA4 and GA,3 was higher in Salix seedlings than in rice bioassay. GAjs, GA,7, GAj, and GA:4] had only a slight or an insignificant effect on Salix seedlings, and these gibberellins are generally inactive in tnost bioassays (Hoad and Kuo 1970, Reeve and Crozier 1975, Graebe and Ropers 1978. The number of different GA's tested in Salix seedlings is still too small to draw any conclusions on the structure-activity relationship in this system.…”