香草酸对花生植株生长、产量构成因素及根际土壤环境的影响

Effects of vanillic acid on growth and yield components of peanut and its rhizosphere soil

为了解花生连作障碍机理,分析香草酸对花生生长的抑制作用,设置香草酸浓度为0、0.1、0.5、1μmol·g^(-1)干土,以花生品种粤油7号为材料进行盆栽试验,调查外源施加香草酸后,花生不同生育时期叶片丙二醛(MDA)含量、花生根系抗氧化酶活性(CAT、POD、SOD)、花生基础农艺性状、花生根际土壤养分含量及土壤酶的活性。结果发现,花生植株的主根长、主茎长、分枝数和产量均随外源香草酸的浓度增加而降低。同时,不同浓度香草酸处理后,均对花生植株的MDA含量、CAT和SOD酶活性产生化感促进作用,而对花生主根长、主茎长、分枝数和产量产生化感抑制作用,从而影响了花生对土壤养分的吸收,导致经香草酸处理后的花生土壤过氧化氢酶、酸性磷酸酶活性和土壤速效养分均高于对照处理。

To better understand the mechanism of continuous cropping on peanut growth,simulative soil with vanillic acid was used in pot experiment.The vanillic acid concentration was set to 0,0.1,0.5,1μmol·g-1 dry soil,and peanut variety Yueyou 7 was used as material.Traits were investigated after the exogenous application of vanillic acid,including malondialdehyde(MDA)content,peanut root antioxidant enzyme activity(CAT,POD,SOD),basic agronomic traits of peanut,nutrient content of rhizosphere soil and soil enzyme activity at different growth stages.It was found that vanillic acid inhibited the main root length,main stem length,branch number and yield of peanut.All concentrations of vanillic acid had a chemistorizing effect on MDA content,CAT and SOD enzyme activities,and had allelopathic inhibitory effects on the length of the main root,main stem,number of branches and yield of peanuts,which affected peanut absorption of soil nutrients,resulting in higher enzyme activities than control.