园艺学报 ›› 2009, Vol. 36 ›› Issue (10): 1465-1472.

• 蔬菜 • 上一篇    下一篇


刘义玲;李天来*; 孙周平;陈亚东   

  1. (沈阳农业大学园艺学院, 设施园艺省部共建教育部重点实验室, 辽宁省设施园艺重点实验室, 沈阳110161)
  • 收稿日期:2009-06-01 修回日期:2009-08-12 出版日期:2009-10-25 发布日期:2009-10-25
  • 通讯作者: 李天来

Effects of Root-zone Hypoxia Stress on the Photosynthesis, Yield and Quality of Muskmelon

LIU Yi-ling, LI Tian-lai*; SUN Zhou-ping;CHEN Ya-dong   

  1. (College of Horticulture, Shenyang Agricultural University, Key Laboratory of Protected Horticulture, Ministry of Education, Key Laboratory of Protected Horticulture of Liaoning Province, Shenyang110161, China)
  • Received:2009-06-01 Revised:2009-08-12 Online:2009-10-25 Published:2009-10-25
  • Contact: LI Tian-lai

摘要: 采用气雾法栽培系统, 研究了网纹甜瓜根际低氧(10%、5% O2 ) 胁迫对果实发育期间光合
作用及产量和品质的影响。结果表明: 低氧胁迫明显降低了叶片光合色素含量、净光合速率( Pn ) 、气孔导度(Gs ) 、胞间CO2浓度(Ci ) 、蒸腾速率( Tr ) 以及PSⅡ最大光化学效率( Fv /Fm ) 和PSⅡ潜在活性( Fv /Fo ) , 显著提高了气孔限制值(Ls ) ; 显著降低了单株产量和果实中维生素C、蛋白质、可溶性糖及主要芳香物质含量, 提高了有机酸含量, 降低了糖酸比。说明网纹甜瓜果实发育期间根际O2浓度降到10%及以下时, 光合作用及果实发育就会受到显著抑制, 从而导致产量和品质降低。

关键词: 网纹甜瓜, 根际低氧胁迫, 光合作用, 产量, 品质

Abstract: By the aeroponics culture system, the effects of root-zone hypoxia stress (10% and 5% O2 )on the leaf photosynthesis, fruit yield and quality of muskmelon were studied. The results showed that there were distinct decreases in the contents of photosynthesis pigments, net photosynthetic rate ( Pn ) , stomatal conductance (Gs ) , intercellular CO2 concentration (Ci ) , transp iration rate ( Tr ) and the maximal photo chemical efficiency of PSⅡ ( Fv /Fm ) and PSⅡ potential activity ( Fv /Fo ) under the root-zone hypoxia stress as compared with the control ( 21% O2 ). However, the stomatal limitation value (Ls ) was significantly increased. In addition, the results of yield and fruit quality showed that root-zone hypoxia stress markedly reduced the fruitweight per plant, and the contents of vitamin C, protein, soluble sugar and ratios of sugar/acid in fruit, in contrary, the content of organic acid was increased. Besides, the main aroma components detected were also declined with the decrease of the root-zone oxygen concentration. This indicated that leaf photosynthesis and fruit growth ofmuskmelon will be inhibited obviously when the root-zone oxygen concentration were lower than 10% during the fruit development, the yield and quality of muskmelon fruit decreased.

Key words: muskmelon, root-zone hypoxia stress, photosynthesis, yield, quality