NaCl胁迫对白三叶一些生理特性的影响

Effects of NaCl stress on some physiological characteristics of white clover

以白三叶Trifolium repens幼苗为材料,研究了不同浓度NaCl胁迫对白三叶叶绿素含量和细胞膜透性的影响。结果表明:随着NaCl浓度的增加,白三叶叶绿素a(Chla)、叶绿素b(Chlb)和叶绿素总含量(Chl)呈先升高后降低的趋势,当NaCl浓度为150 mmol/L时,叶中的Chla、Chlb、Chl含量与对照相比升高;当NaCl浓度继续增加时,叶中的Chla、Chlb、Chl含量与对照相比则下降。随NaCl浓度的增加,相对电导率呈先升高后降低的趋势,NaCl浓度为200 mmol/L时,叶的相对电导率最大。

The seedling of Trifolium was treated with different concentrations of NaCl. Thedynamics of chlorophyll a （Cha）, chlorophyll b （Chb） and total contents of chlorophyll （Chl） and cell membrane permeability in response to salt stress were studied. The results showed that the contents of Cha, Chb, Chl and the relative conductivity increased at first and then decreased when NaCl concentration increased or salt stress was prolonged. The contents of Cha, Chb and Chl increased when NaCI concentration was below 150 mmol/L, and then they decreased along with the increase of NaCl concentration. The relative conductivity reached the maximun at 200 mmol/L of NaCI concentration.