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Effects of prohexadione (BX‐112) and gibberellins on shoot growth in seedlings of Salix pentandra
Author(s) -
Junttila Olavi,
Jensen Einar,
Ernstsen Arild
Publication year - 1991
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1991.tb01275.x
Subject(s) - gibberellin , shoot , elongation , gibberellic acid , photoperiodism , botany , horticulture , biology , chemistry , germination , materials science , metallurgy , ultimate tensile strength
Effects of gibberellins A 1 , A 4/7 , A 9 , A 19 and A 20 and growth retardants were studied on shoot elongation in seedlings of Salix pentandra L. The growth‐retarding effects of CCC and ancymidol were antagonized by all the gibberellins tested. The novel plant growth regulator prohexadione (free acid of BX‐112), which is suggested to block 3β‐hydroxylation of gibberellins, effectively prevented shoot elongation in seedlings grown under long photoperiod. Initiation of new leaves was only slightly reduced. GA 1 , but not GA 19 and GA 20 , was active in overcoming the inhibition of stem elongation of seedlings, treated with prohexadione, GA 19 , GA 20 and GA 1 are native in S. pentandra , and the results are compatible with the hypothesis that GA 1 is active per se in shoot elongation, and that the effect of GA 19 and GA 20 is dependent on their conversion to GA 1 . A mixture of GA 4 and GA 7 was as active as GA 1 in promoting shoot elongation in seedlings treated with prohexadione, while GA 9 showed slight activity only when applied at high doses.