盐胁迫对番茄幼苗生理特性及离子分布的影响

Effects of salt stress on physiological characteristics and ion distribution of tomato seedlings

试验以番茄(CM966)为试验材料,研究了NaCl胁迫下番茄幼苗活性氧清除系统活性和离子分布的特点。结果表明:番茄叶片中过氧化氢酶(CAT)、超氧化物歧化酶(SOD)、过氧化物酶(POD)活性随NaCl浓度的升高而增强;随NaCl处理时间的增加,丙二醛(MDA)、脯氨酸(Pro)含量呈上升趋势,这表明番茄叶片内活性氧未能被保护酶系统完全清除,仍有大量残留。随NaCl处理浓度的升高,CM966根系与茎中K+含量呈显著下降趋势,相反,其叶片中K+含量则呈上升趋势,而CM966叶片与茎中的Na+含量呈上升趋势。当NaCl处理浓度<100mmol/L时,CM966根中Na+含量呈上升趋势,大于150mmol/L后呈降低趋势。随NaCl处理浓度的增加,幼苗体内器官的K+/Na+呈下降趋势。

In this experiment,“CM966” tomato was used as the experimental material to study the activity of the reactive oxygen scavenging system and ion distribution characteristics of tomato seedlings under NaCl stress.The results showed that increasing NaCl concentration increased the activities of CAT,SOD and POD in tomato leaves.With increasing time of NaCl treatment,MDA and Pro contents showed upward trends,which indicated that the ROS in tomato leaves could not be completely removed by the protective enzyme system,and there was still a large amount of residue.With the increase of NaCl concentration,the contents of K+ in CM966 roots and stems showed significant downward trends. On the contrary,the content of K+ in the leaves showed an upward trend,while the contents of Na+ in the leaves and stems of CM966 showed upward trends.When the NaCl concentration was no higher than 100 mmol/L,the Na+ content in CM966 roots showed an upward trend,and a downward trend when the concentration was higher than 150 mmol/L.With the increase of NaCl treatment concentration,K+/Na+ of tomato seedlings showed a decreasing trend.