摘要
榉树是一种用材和园艺观赏硬质阔叶树种。为了了解内源植物激素与榉树实生苗生长状况的关系,采用反相高效液相色谱法测定了榉树实生苗内源IAA、GA3、ZT和ABA的水平。结果表明,这4种内源激素含量呈现先降低、再升高、然后下降的趋势。当3月顶芽萌发的时候,IAA和ZT水平较高,而GA3和ABA水平较低。过了萌芽期后,4种激素含量缓慢下降。在5月初,4种激素的含量稳步升高。在7月中旬,IAA和ABA含量达到最高值,随后开始下降。在8月末,ZT和GA3含量达到最高值,随后开始下降。7月下旬ABA含量有所下降,随后保持稳定。ABA含量的稳定说明其在秋季对芽生长有一定的抑制作用。10月,苗木开始了生理休眠。在苗木的整个生长周期中,ABA和GA3,IAA和ZT含量的比值均呈现"W"形的变化趋势,说明5月和8月是榉树苗木的2个快速生长期。
Zelkova schneideriana is a valued hardwood used for timber and gardening.In order to find the relationship between the content of endogenous plant hormones and the seedling growth condition of Z.schneiderian,the levels of endogenous IAA,GA3,ZT,and ABA in seedlings were detected by RP-HPLC.The results showed that the contents of four endogenous hormones first decreased,and then increased,finally dropped.Specifically,there were high levels of IAA and ZT but low levels of GA3 and ABA when the terminal bud was bourgeon at March.After the period of budding,the contents of the four hormones decreased slowly.Each hormone′s content increased steadily in early May.The levels of IAA and ABA reached the maximum in mid-July and then declined.The levels of ZT and GA3 reached their highest level at the end of August and reduced in the subsequent phase of growth.There was a decrease in the ABA content in late July and then it stabilized thereafter.This steady level of ABA showed a correlation with inhibition of bud growth in cool autumn.The seedlings came into a physiological dormancy at October.The ratios of ABA to GA3 and IAA to ZT showed a trend like letter ＂W＂ during the growth of seedlings.It suggests that May and August are two flourishing growth periods for Z.schneideriana seedlings.
出处
《经济林研究》
2011年第4期1-5,共5页
Non-wood Forest Research
基金
国家林业公益性行业科研专项“榉树优良种源选择及快速繁育技术研究”(200904011)
关键词
内源植物激素
HPLC
榉树
实生苗
endogenous plant hormones
HPLC
Zelkova schneideriana
seedling
