不同激素对锦绣杜鹃的催花作用

Effects of different plant hormones on flower induction of Rhododendron pulchrum

在加温、补光条件下,研究赤霉素(GA3)、萘乙酸(NAA)和吲哚乙酸(IAA)处理对锦绣杜鹃花蕾发育、开花期及开花质量等的影响。结果表明:锦绣杜鹃花蕾经0～3000mg.L-1GA3涂抹后,其催花效果随处理浓度增大呈先升后降趋势,并于2000mg.L-1浓度下达到最佳,表现在花蕾发育快、开花期提前及开花质量高等;而0～3000mg.L-1NAA和IAA对锦绣杜鹃催花效果均不明显。锦绣杜鹃花蕾大小(包括长度和宽度)与开花期提前时间和花径之间均呈极显著正相关,与花蕾期则呈极显著负相关;花蕾期与开花期提前时间之间呈极显著负相关(P<0.01)。

Effects of GA3 ,NAA,IAA on flower bud growth and flowering stage, flowering quality of Rhododendron pulchrum under supplementary light and temperature conditions were studied. The results were as follows： （a）effects of flower induction of Rh. pulchrurn appeared to increase initially and then reached their peaks at 2 000 mg·L^-1 and tended to decline later on with GAa treatments,and it mainly displayed that the flower bud grow rapidly, the time of flowering stage promoted and the flowering quantity improved. But there were no effects on flower induction of Rh. pulchrum treated with 0--3 000mg·L^-1 NAA and 0--3 000mg·L^-1 IAA. （b）flower bud of Rh. pulchrurn was significantly positively correlated with the time of flowering stage promoted and flower diamiter,but it was negatively correlated with flower bud stage. And flower bud stage was negatively correlated with the time of flowering stage promoted（P〈0.01）.