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Growth-promoting activity of gibberellins on shoot elongation in Salix pentandra is reduced by 16,17-dihydro derivatisation 总被引:1,自引:0,他引:1
The metabolism of GA10 is thought to be under photoperiodic control in the woody plant Salix pentandra . However, in a recent study using 16,17-[3 H2 ]GA19 as a mimic of Ga10 , no effect of photoperiod was found on its metabolism to 16,17-dihydro-GA20 and 16,17-dihydro-GA1 . 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 GA19 , GA1 , and GA1 as compared with their parent GAs, on shoot elongation in seedlings of S. pentandra were studied. 16,17-Dihydro-GA19 , and -GA20 were both almost inactive, while 16,17-dihydro-GA1 induced some shoot elongation in seedlings treated with ancymidol as well as under short days. GA19 , GA20 and GA1 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 GA20 and GA1 . 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. 相似文献
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