College of Chemical and Life Science, Shenyang Normal University, Shenyang, People's Republic of China.
J Chem Ecol. 2011 Jul;37(7):779-84. doi: 10.1007/s10886-011-9975-7. Epub 2011 May 25.
We investigated endogenous plant hormones and needle growth in Pinus tabulaeformis plants grown in open-top chambers and exposed to ambient or elevated concentrations of carbon dioxide (CO(2)) and/or ozone (O(3)). Exposure to elevated CO(2) for 100 days significantly increased the change in fresh needle weight, indole-3-acetic acid (IAA), isopentenyl-adenosine (iPA), and dihydrozeatin riboside (DHZR) content. Abscisic acid (ABA) content decreased, and no effect was observed on zeatin riboside (ZR) content or changes in needle dry weight. The ratios of IAA/ABA and total cytokinins (CKs)/ABA [Formula: see text] were increased. Elevated O(3) significantly decreased IAA and ZR, and decreased the ratios of IAA/ABA and CKs/ABA. Ozone treatment increased ABA content but did not change iPA or DHZR content or change fresh or dry needle weights. The combination treatment significantly increased ABA content and the IAA/ABA ratio but decreased the total CKs/ABA ratio and had no effect on CKs or IAA content or change in fresh and dry needle weights. The results indicate that elevated CO(2) ameliorated the effects of elevated O(3) on tree growth.
我们研究了在开顶式气室中生长的华山松植物中的内源性植物激素和针叶生长情况，并将其暴露于大气或升高浓度的二氧化碳（CO(2)）和/或臭氧（O(3)）中。暴露于升高的 CO(2) 100 天可显著增加新鲜针叶重量、吲哚-3-乙酸（IAA）、异戊烯基腺苷（iPA）和二氢玉米素核苷（DHZR）的变化。脱落酸（ABA）含量降低，而玉米素核苷（ZR）含量或针叶干重的变化则没有受到影响。IAA/ABA 和总细胞分裂素（CKs）/ABA 的比值[公式：见正文]增加。升高的 O(3)可显著降低 IAA 和 ZR，并降低 IAA/ABA 和 CKs/ABA 的比值。臭氧处理增加了 ABA 含量，但未改变 iPA 或 DHZR 含量或新鲜或干燥针叶的重量。联合处理可显著增加 ABA 含量和 IAA/ABA 比值，但降低总 CKs/ABA 比值，对 CKs 或 IAA 含量或新鲜和干燥针叶的重量变化没有影响。结果表明，升高的 CO(2)可减轻升高的 O(3)对树木生长的影响。
