大气CO_2浓度升高对毛竹叶片膜脂过氧化和抗氧化系统的影响  

Effects of elevated atmospheric CO_2 on membrane lipid peroxidation and anti-oxidation system of Phyllostachys edulis leaves

作　　者：庄明浩[1] 李迎春[1] 郭子武[1] 杨清平[1] 李应[1] 樊艳荣[1] 陈双林[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400

出　　处：《生态学杂志》2012年第5期1064-1069,共6页Chinese Journal of Ecology

基　　金：国家公益性行业(林业)科研专项(201004008);中央级公益性科研院所基本科研业务费专项资金(RISF6915);浙江省省院合作项目(2010SY01)资助

摘　　要：为了解竹子对大气CO2浓度升高的生理响应,为气候变化背景下的竹林适应性管理提供理论依据,运用开顶式气室(OTCs)设置了3个CO2处理浓度(环境大气、500和700μmol·mol-1),探讨了大气CO2浓度升高对毛竹(Phyllostachys edulis)叶片光合色素、膜脂过氧化和抗氧化系统的影响。结果表明:与环境大气比较,500μmol·mol-1浓度处理30d时对毛竹叶片光合色素、膜脂过氧化和抗氧化系统影响并不明显,仅叶片CAT活性显著降低;随着处理时间的延长,对毛竹叶片膜脂过氧化和抗氧化系统的影响逐渐显现,至处理90d时,除叶片可溶性糖含量无明显变化,其他测定指标均有显著变化;700μmol·mol-1浓度处理在不同时间上对毛竹叶片膜脂过氧化和抗氧化系统的影响均较500μmol·mol-1CO2浓度处理明显,处理30d时毛竹叶片可溶性糖含量和抗氧化酶活性有明显变化,处理90d时,各项测定指标均有显著变化;研究表明大气CO2浓度升高一定程度上能增强毛竹的抗氧化能力,但光合产物的过量积累也会造成碳水化合物源-库失衡和Rubisco的再生受到反馈作用抑制。In order to supply theoretical basis for the management of moso bamboo （Phyllostachys edulis） under the background of climate change, open-top chambers （OTCs） were employed to study the physiological responses of P. edulis to elevated atmospheric CO2 concentration. Three treatments were installed, i.e., ambient 350 μmol CO2·mol-1 （CK）, 500 μmol CO2·mol-1 （T1）, and 700 μmol CO2·mol-1 （T2）, with the leaf photosynthetic pigments, membrane lipid peroxidation, and anti-oxidation system determined. There were no significant differences in the test physiological parameters between treatments CK and T1 in the initial 30 days, except that the CAT activity in treatment T1 had a significant decrease. With the increasing time of treating with 500 μmol CO2·mol-1, the effects on the membrane lipid peroxidation and anti-oxidation system appeared gradually, and after 90 days, the test physiological indicators except soluble sugar content changed significantly. In treatment T2, the membrane lipid peroxidation and anti-oxidation system were more affected than in treatment T1. In the initial 30 days, the soluble sugar content and the anti-oxidation enzyme activities changed obviously; and after 90 days, all the test physiological parameters had significant change. It was concluded that elevated atmospheric CO2 concentration could enhance the antioxidant capacity of P. edulis to a certain extent, but the excessive accumulation of photosynthetic products could induce the carbohydrate source-pool imbalance and the feedback inhibition of Rubisco regeneration.

关 键 词：毛竹 CO2浓度 光合色素 膜脂过氧化 抗氧化系统 

分 类 号：S795.7[农业科学—林木遗传育种]