根际CO_2浓度富集对番茄光合生理的影响  

Effect of root-zone CO_2 enrichment on tomato photosynthetic physiology

作　　者：赵旭[1] 刘艳芝[2] 李天来[3] 孙周平[3] 

机构地区：[1]济宁市农业技术推广站,山东济宁272019 [2]济宁市农业科学研究院,山东济宁272009 [3]沈阳农业大学园艺学院,沈阳110866

出　　处：《应用生态学报》2015年第7期2069-2073,共5页Chinese Journal of Applied Ecology

基　　金：济宁市科技发展计划项目资助

摘　　要：本文采用气雾法栽培方式,研究了60 d根际CO2浓度富集处理对番茄光合生理的影响.结果表明:2500μL·L–1及以上CO2浓度处理下,番茄植株叶片叶绿素含量、叶面积显著降低,叶片Mg2+-ATPase、Ca2+-ATPase和磷酸烯醇式丙酮酸羧化酶(PEPC)活性显著减少,而根系PEPC活性显著增加,叶片净光合速率、气孔导度和胞间CO2浓度均显著降低.表明根际高CO2浓度条件下,根系PEPC活性增强、叶片固定CO2的能力减弱、叶片Mg2+-ATPase和Ca2+-ATPase活性显著降低,根际长期高CO2浓度处理可能是导致植株光合生理指标下降的原因之一.The root system of tomato plant （Lycopersicon esculentum L. cv. Liaoyuanduoli） was trea- ted with CO2 enrichment by aeroponical culture for 60 days. The experiment showed that the chloro- phyll content and leaf area of tomato plant were significantly lower under 2500 μL · L-1 or above CO2 condition of root zones than under 370 μL · L-1 CO2 condition. At the same time the Ca2＋- ATPase, Mg2＋-ATPase and phosphoenolpyruvate carboxylase （PEPC） of plant leaf were significantly reduced while the PEPC of root increased significantly, which resulted in the significant decreases of net photosynthetic rate, stomatal conductance and intercellular CO2 concentration of plant leaves. The results indicated that under a long-term root-zone CO2 enrichment condition, the decline of photosyn- thetic physiological parameters of tomato leaf maybe mainly result from the increased PEPC of root, and the decreased CO2 fixation, Mg〉-ATPase and Ca2＋-ATPase of leaves.

关 键 词：根际CO2浓度 番茄 光合生理 

分 类 号：S641.2[农业科学—蔬菜学]