外源EBR与ALA对高温胁迫下辣椒幼苗生长的影响

Effect of Exogenous EBR and ALA on Chilli Seedling Growth under High-Temperature Stress

为探究外源EBR和ALA对高温胁迫下越夏辣椒幼苗生长的影响,以博辣红牛和长研青香2个辣椒品种为试材,喷施不同浓度的EBR(0.001、0.01、0.1、1.0 mg·L^(-1))与ALA(15、30、45、60 mg·L^(-1))。结果表明:外源EBR和ALA均能不同程度地提升幼苗抵御高温逆境的能力,喷施不同浓度的EBR和ALA后,辣椒幼苗株高、茎粗、干鲜质量、壮苗指数等生长指标均呈上升趋势,抗氧化酶SOD、POD、CAT活性增强,MDA含量降低,脯氨酸、可溶性糖、可溶性蛋白含量增加,NR、Ni R、GS等氮代谢关键酶活性显著提升,且以0.01 mg·L^(-1)EBR和45 mg·L^(-1)ALA处理缓解高温胁迫效果最好。

In order to investigate the effects of exogenous EBR and ALA on over-summer growth of chilli seedlings under high-temperature stress,this experiment took 2 chilli varieties‘Bolahongniu’and‘Changyanqingxiang’,as test material,and sprayed different concentrations EBR(0.001,0.01,0.1,and 1.0 mg·L^(-1))and ALA(15,30,45,and 60 mg·L^(-1)).The results showed that exogenous EBR and ALA all could enhance seedling ability of resisting high-temperature adversity to different extent.After spraying different concentrations of EBR and ALA,the growth indexes of chilli seedlings including plant height,stem thickness,dry and fresh mass,and sound seedling index,etc.all showed an upward trend.The activities of antioxidant enzymes as SOD,POD,and CAT were strengthened.The content of MDA was reduced.The contents of proline,soluble sugar,and soluble protein were increased.The activities of key nitrogen metabolism enzymes like NR,NiR,GS,etc.were significantly enhanced.The treatment of 0.01 mg·L^(-1)EBR and 45 mg·L^(-1)ALA had the best effect on relieving high-temperature stress.