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根际CO2浓度富集对番茄光合生理的影响

赵旭1**,刘艳芝2,李天来3,孙周平3   

  1. 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)
  • 出版日期:2015-07-18 发布日期:2015-07-18

Effect of root-zone CO2 enrichment on tomato photosynthetic physiology.

ZHAO Xu1, LIU Yan-zhi2, LI Tian-lai3, SUN Zhou-ping3   

  1. (1Jining Center for Popularization of Agricultural Technique, Jining 272019, Shandong, China; 2Jining Agricultural Science Research Institute, Jining 272009, Shandong, China; 3College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China)
  • Online:2015-07-18 Published:2015-07-18

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: 2500 μL·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.
 

Abstract:

The root system of tomato plant (Lycopersicon esculentum L. cv. Liaoyuanduoli) was treated with CO2 enrichment by aeroponical culture for 60 days. The experiment showed that the chlorophyll 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 photosynthetic physiological parameters of tomato leaf maybe mainly result from the increased PEPC of root, and the decreased CO2 fixation, Mg2+ATPase and Ca2+ATPase of leaves.