Premium
Growth‐promoting activity of gibberellins on shoot elongation in Salix pentandra is reduced by 16,17‐dihydro derivatisation
Author(s) -
Olsen J. E.,
Junttila O.
Publication year - 1997
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.1399-3054.1997.tb03431.x
Subject(s) - gibberellin , elongation , shoot , photoperiodism , botany , horticulture , metabolism , biology , chemistry , biochemistry , materials science , metallurgy , ultimate tensile strength
The metabolism of GA 10 is thought to be under photoperiodic control in the woody plant Salix pentandra . However, in a recent study using 16,17‐[ 3 H 2 ]GA 19 as a mimic of Ga 10 , no effect of photoperiod was found on its metabolism to 16,17‐dihydro‐GA 20 and 16,17‐dihydro‐GA 1 . To investigate if this was due to differential action of exogenous 16,17‐dihydro‐GAs and GAs, the effects of the 16,17‐dihydro‐derivatives of the gibberellins GA 19 , GA 1 , and GA 1 as compared with their parent GAs, on shoot elongation in seedlings of S. pentandra were studied. 16,17‐Dihydro‐GA 19 , and ‐GA 20 were both almost inactive, while 16,17‐dihydro‐GA 1 induced some shoot elongation in seedlings treated with ancymidol as well as under short days. GA 19 , GA 20 and GA 1 were all able to counteract the inhibitory effect of ancymidol under continuous light, while inhibition induced by a 12‐h photoperiod was antagonised only by GA 20 and GA 1 . Thus, the growth‐stimulating activity of the tested GAs is significantly reduced by 16,17‐dihydro derivatisation, but the derivatives do not inhibit stem elongation in S, pentandra , as has been found in monocotyledons.