浙江农业学报

• 园艺科学 • 上一篇    下一篇

盐胁迫对秋季香樟幼苗抗氧化酶系统和光合特性的影响

  

  1. (宿迁学院 二系,江苏 宿迁 223800)
  • 出版日期:2014-09-25 发布日期:2014-10-11

Effect of salt stress on photosynthetic characteristic and antioxidant enzyme system of Cinnamomum camphora seedlings in autumn

  1. (Second Department of Suqian College, Suqian 223800, China)
  • Online:2014-09-25 Published:2014-10-11

摘要: 以2年生的香樟幼苗为试材,以蒸馏水为对照,分别用50,100,200 mmol·L-1的NaCl和Na2SO4处理,研究秋季香樟幼苗可溶性糖含量、抗氧化酶系统及光合特性的变化。结果表明:随NaCl胁迫程度的增加,香樟叶片光合色素含量、叶绿素a/b值、SOD活性和POD活性呈先上升后下降趋势,净光合速率、气孔导度、蒸腾速率、胞间CO2浓度降低,可溶性糖含量、电导率、丙二醛含量升高;随Na2SO4胁迫程度的增加,植物体内光合色素含量、叶绿素a/b值、SOD活性和POD活性呈先升后降趋势,植物叶片的净光合速率、气孔导度和蒸腾速率呈下降趋势,可溶性糖含量、电导率、丙二醛含量和胞间CO2浓度呈上升趋势。香樟幼苗对低浓度的盐胁迫具有一定程度的耐受性,而NaCl胁迫对香樟幼苗的影响要高于Na2SO4。

关键词: 盐胁迫, 香樟幼苗, 抗氧化酶系统, 光合特性

Abstract: Taking the biennial Cinnamomum camphora seedlings as experimental materials, treated with 0, 50,100 and 200 mmol·L-1 NaCl or Na2SO4, soluble sugar content,antioxidant enzyme system and photosynthesis in the seedlings of Cinnamomum camphora during autumn were studied. The results showed that photosynthetic pigments content, SOD activity, POD activity and the value of chlorophyll a/b increased firstly, then decreased. Photosynthetic rate, stomatal conductance, transpiration rate, CO2 intercellular concentration reduced, while soluble sugar content, MDA content and plant tissue conductivity increased with the increased concentration of NaCl. With the increased concentration of Na2SO4, photosynthetic pigments content, SOD activity, POD activity and the value of chlorophyll a/b firstly increased and then decreased. The photosynthetic rate, stomatal conductance and transpiration rate showed a downward trend, and CO2 intercellular concentration, soluble sugar content, MDA content and plant tissue conductivity increased. Cinnamomum camphora seedlings had a certain degree of tolerance under low concentration of salt stress, and the effect of NaCl stress on Cinnamomum camphora seedlings was higher than that of Na2SO4.

Key words: salt stress, Cinnamomum camphora, antioxidant enzyme system, photosynthetic characteristic