不同品种番茄对硝酸盐胁迫响应及耐盐指标评价

Responses of Different Varieties of Lycopersicon esculentum to Nitrate Stress and Evaluation of Salt Tolerance Indexes

以6个番茄品种为试材,采用不同浓度的Ca(NO3)2溶液人工模拟盐胁迫,通过幼苗期的株高、根长、苗和根干鲜重、相对含水量、净光合速率等指标对6个品种进行耐盐性评价。结果表明:随着盐胁迫浓度的增加,根长、苗和根干鲜重盐害系数变化较大,可以作为衡量植株耐盐性强弱的参考指标。试验中叶片含水量和净光合速率变化趋势与株高相似,均可为鉴定耐盐性提供参考。综合分析,5号品种相对于其他品种耐盐性最强,1、4号品种次之,2、3号品种耐盐性较差,6号品种耐盐性最弱。Ca(NO3)2浓度为75 mmol/L时,不同耐盐性的番茄表现差异较大,可作为耐盐性鉴定的适宜浓度。

In this study,salt tolerance of six varieties of Lycopersicon esculentum was evaluated by artificially simulated salt stress with different concentrations of Ca(NO3)2 solution.We evaluated salt tolerance by determining plant height,root length,seedling and root dry weight,relative water content,and leaf net photosynthetic in seedling stage.The results showed that with the increase of salt stress concentration,salt stress coefficient of root length,seedling and root dry weight changed greatly,which could be used as a reference index to assess salt tolerance of plants.The change of leaf water content and net photosynthetic rate in the experiment was similar to that of plant height,which could provide reference for the identification of salt tolerance.In conclusion,No.5 variety showed the strongest salt tolerance compared to the others,followed by No.1 and No.4 varieties,No.2 and No.3 varieties had poor salt tolerance,and No.6 variety showed the weakest salt tolerance.The performance of Lycopersicon esculentum with different salt tolerance varied significantly in the condition of 75 mmol/L Ca(NO3)2 solution,and therefore,this concentration could be used as the suitable concentration for salt tolerance identification.