低浓度NaCl对玉米幼苗光合作用的影响

Effect of Low NaCl Level on Photosynthesis of Zea mays Seedlings

以Hoagland溶液为基础培养液,采用沙培法,研究了0,5,10,20,30mmol/L NaCl对玉米(Zea mays)幼苗光合作用的影响。结果表明,低浓度NaCl(5,10mmol/L NaCl)处理使其叶绿素含量增加,Chla/Chlb增大,PEPCase活性提高,光合速率增强。说明低盐促进玉米的光合作用可能与叶绿素含量增加,Chla/Chlb增大以及PEPCase活性提高有关。

Seedlings of Zea mays cultured with Hoagland nutrient solutions were treated with different low levels of NaCl （0, 5, 10, 20, 30 mmol/L）. After 30 days treatment, several physiological paramaters were determined, including the content of chlorophyll, the Chla/Chlb ratio, the activity of PEPCase and the photosynthetic rate （Pn）. The results showed that the content of chlorophyll, the Chla/Chlb ratio, the photosynthetic rate and the activity of PEPCase increased under low NaCI level （5, 10 mmol/L）. It could be concluded that the rise in photosynthesis of Zea mays seedlings under low NaCl level might be related to those changes in the physiological parameters above.