NaCl胁迫对三种狼尾草生长及生理特性的影响

Effect of NaCl on Growth and Physiological Characteristics of Three Pennisetum Species

为掌握3种狼尾草的耐盐性,对它们进行为期30d的NaCl盐胁迫试验,设置5个土壤含盐量梯度处理,分别为0.25,0.35,0.50,0.60,0.8g·kg^-1,以清水为对照。测定相关形态及生理指标,结合死亡率、枯叶率和茎叶生长量进行分析。结果表明:3种狼尾草耐盐能力由强至弱的次序为长穗狼尾草、矮株狼尾草、东方狼尾草,它们能够忍受的土壤NaCl含量分别为0.60,0.60,0.50g·kg^-1。随着土壤含盐量的增加,3种狼尾草叶片中SOD及CAT的活性均呈现先升高后降低的变化趋势;MDA含量呈先上升后下降,最后又上升的变化趋势,且与SOD和CAT活性的变化有一定的关系。

In order to investigate the salt tolerance of three Pennisetum species,NaCl stress test was carried out for a period of 30 days.Five treatments of different soil salinity,including 0.25,0.35,0.50,0.60 and 0.80 g ·kg^-1 ,were set up to study their morphological and physiological changes.Taking water treatment as control.Based on mortality,the percentages of dead leaves and the growth of stalk and leaf,the results showed that the order of the salt tolerance of three species from strong to weak was as follows: Pennisetum alopecuroides Changsui, P.alopecuroides Aizhu and P.orientale;and the soil salinity they were able to tolerate were 0.60,0.60 and 0.50 g ·kg^-1 ,respectively.With increasing soil salinity,the activity of SOD and CAT in the leaves of all three Pennisetum species showed a trend of increasing first and then decreasing.The content of MDA increased at first and then decreased,finally increased,which was related to the changes of SOD and CAT activities.