红松果林从幼龄到开花阶段植株体内激素动态变化

Dynamic Changes of Hormone in the Plants from Teneral Stage to Blossom Phase of Pinus koraiensis Fruit Forests

针对红松果林从幼龄到开花阶段植株体内激素水平的变化、激素水平的季节动态以及施入赤毒素(GA3)后对植株开花的作用,从果林中选取7～8年生、11～12年生和17～18年生3个年龄阶段的植株为对象进行研究.结果表明:红松幼龄时生长素(IAA)和玉米素核苷(ZR)的含量偏低,随着树龄增大而升高,至18年左右其含量又逐渐降低;激素的季节动态变化为5月末IAA和ZR的含量达到了最高水平,7月中旬后明显降低;从不同性型植株的激素水平来看,雌型植株体内IAA、ZR和脱落酸(ABA)的含量在春、夏、秋3个季节均高于同龄的雄型植株,3种激素的平均高出值分别为36.11%,43.58%和31.68%;施入外源激素20 mg的GA3或玉米素(ZT)时,对增加雌球花数量有较好效果.

This study investigated the changes in hormone levels in the plants of Pinus koraiensis from teneral stage to blossom phase and in different seasons , and the function of gibberellin（ GA3 ） on selected plants in fruit forest of three different age period, 7～8 years old, 11～12 years old, 17 ～ 18 years old, respectively. The result showed that the contents of indoleacetic acid （IAA） and zeatin riboside（ZR） in teneral stage being lower, as P. koraiensis became older, the contents increased;but at 18 years old, the contents of IAA and ZR in plants became lower. The contents of IAA and ZR reached the highest level in the end of May, afterwards, dropped sharply after mid-Jul. The contents of IAA, ZR and abscisic acid（ABA） in female plants in spring, summer and autumn, at the hormone level of plants, were on average and respectively 36.11%, 43.58% and 31.68% higher than those in male plants at the same age. With the aid of external hormone input with the appropriate dosage, certain effects, with the best effect GA3 or zeatin（ZT） of 20 mg, on increased conelet yield were obtained.