大气二氧化碳浓度升高对银杏叶片内源激素的影响

采用开顶箱系统，研究了银杏叶片内源激素脱落酸(ABA)、吲哚乙酸(IAA)、玉米素核苷(ZR)和赤霉素(GA₃)对大气CO₂浓度升高(环境CO₂浓度+350 μmol·mol^-1，EC)的响应.结果表明，EC处理能使ABA含量降低，与对照(CK)相比, ABA含量最大降低63.0%(处理后120 d).EC处理使叶片IAA和ZR含量增加，而且随着处理时间的延长，差异均达显著水平；IAA含量在处理后100 d为CK的2倍，ZR含量在处理后80 d时为CK的2.5倍.EC处理使叶片GA₃峰值提前出现. (IAA+GA₃+ZR)/ABA比值随着银杏的生长逐渐降低，在处理后期(处理后40～120 d)明显高于CK，表明大气CO₂浓度升高可促进银杏的生长发育.

Effects of elevated atmospheric CO2 concentration on endogenous hormones in gingko leaves.

With top-opened chamber system, this paper studied the responses of endogenous hormones abscisic acid (ABA), indoleacetic acid (IAA), zeatin riboside (ZR) and gibberellins (GA3) in gingko leaves to elevated atmospheric CO2 concentration (ambient + 350 micromol x mol(-1), EC). The results showed that EC could decrease the ABA content. After treated with EC for 120 days, the ABA content could be decreased by 63.0%, in comparing with the control. EC could also decrease the contents of IAA and ZR, and the decrement could reach significant with the extension of the treatment. The IAA content was 2 times higher after 100 days treatment, and ZR content was 2.5 times higher after 80 days treatment than those of CK. Under EC, the peak of GA3 appeared earlier. The (IAA + GA3 + ZR)/ABA ratio decreased gradually with the growth of gingko, and was obviously higher than the control at later stage (after 40-60 days treatment), indicating that elevated atmospheric CO2 concentration could promote the growth and development of gingko.