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根际CO2浓度升高对网纹甜瓜光合特性及产量和品质的影响

刘义玲1,孙周平1,李天来1**,顾丰颖2,何雨3   

  1. 1沈阳农业大学园艺学院, 沈阳 110866; 2中国农业科学院农产品加工研究所, 北京 100193; 3沈阳市棋盘山国际风景旅游开发区管理委员会, 沈阳 110161)
  • 出版日期:2013-10-18 发布日期:2013-10-18

Effects of elevated rhizosphere CO2 concentration on the photosynthetic characteristics, yield, and quality of muskmelon.

LIU Yi-ling1, SUN Zhou-ping1, LI Tian-lai1, GU Feng-ying2, HE Yu3   

  1. (1College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China; 2Institute of Agroproduct Processing Science and Technology, Chinese Academy of Agricultural Sciences, Beijing 100193; 3Qipanshan Exploitation Managemenrt Committee, Shenyang 110161, China)
  • Online:2013-10-18 Published:2013-10-18

摘要:

采用雾培植株根际通CO2处理方式,研究了开花结果期根际CO2浓度升高对网纹甜瓜光合作用及产量和品质的影响.结果表明:在网纹甜瓜果实发育期间,与350 μL·L-1(对照)处理相比,根际2500和5000 μL CO2·L-1处理的叶片光合色素含量、净光合速率(Pn)、气孔导度(gs)、胞间CO2浓度(Ci)及PSⅡ最大光化学效率(Fv/Fm)均不同程度降低,而气孔限制值(Ls)显著提高,且5000 μL CO2·L-1处理的变化幅度高于2500 μL CO2·L-1处理;单株产量、果实中维生素C和可溶性糖含量显著降低,有机酸含量显著提高.可见,网纹甜瓜果实发育期间根际CO2浓度超过2500 μL·L-1时,其光合作用及果实发育会受到显著抑制,从而导致产量和品质降低.

 

Abstract: By using aeroponics culture system, this paper studied the effects of elevated rhizosphere CO2 concentration on the leaf photosynthesis and the fruit yield and quality of muskmelon during its anthesis-fruiting period. In the fruit development period of muskmelon, as compared with those in the control (350 μL CO2·L-1), the leaf chlorophyll content, net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci), and the maximal photochemical efficiency of PSⅡ(Fv/Fm) in treatments 2500 and 5000 μL CO2·L-1 decreased to some extents, but the stomatal limitation value (Ls) increased significantly, and the variation amplitudes were larger in treatment 5000 μL CO2·L-1  than in treatment 2500 μL CO2·L-1. Under the effects of elevated rhizosphere CO2 concentration, the fruit yield per plant and the Vc and soluble sugar contents in fruits decreased markedly, while the fruit organic acid content was in adverse. It was suggested that when the rhizosphere CO2 concentration of muskmelon during its anthesis-fruiting period reached to 2500 μL·L-1, the leaf photosynthesis and fruit development of muskmelon would be depressed obviously, which would result in the decrease of fruit yield and quality of muskmelon.