贝莱斯芽孢杆菌对桃采后软腐病的防治及对果实诱导抗性的影响

Effects of Bacillus velezensis on Control of Postharvest Soft Rot and Induced Resistance of Peach

为明确贝莱斯芽孢杆菌Q-84对桃果实软腐病的生防效果,本试验以“映霜红”桃为材料,研究Q-84菌悬液对桃采后软腐病的抑制效果及对果实品质的影响,并对果实过氧化物酶(POD)、苯丙氨酸解氨酶(PAL)、几丁质酶(CHI)和脂氧合酶(LOX)4种防御相关酶活性进行测定。结果显示,贝莱斯芽孢杆菌Q-84菌悬液处理可显著抑制桃果实软腐病,抑制果实LOX活性,诱导POD、PAL、CHI活性增加,提高果实抗病和抗氧化能力,减缓桃硬度下降,对桃果实色泽及可溶性固形物和可滴定酸含量无不良影响。表明贝莱斯芽孢杆菌对桃果实软腐病具有较好的防治效果,在桃果实采后生物防腐保鲜领域具有重要应用价值。

In order to clarify the biocontrol effect of Bacillus velezensis Q-84 on soft rot of peach fruits,the inhibition effect of Q-84 suspension on postharvest soft rot of peach fruits and its effects on fruit quality were studied using“Yingshuanghong”peach as experimental material.The activities of four defense-related enzymes including peroxidase(POD),phenylalanine ammonlyase(PAL),chitinase(CHI)and lipoxygenase(LOX)were also determined.The results showed that the treatment of Q-84 suspension could significantly inhibit the soft rot of peach fruits,inhibit the activity of LOX,induce the increase of POD,PAL and CHI activities,improve the disease resistance and antioxidant capacity,and slow down the decline of peach hardness,but had no adverse effects on peach fruit color,soluble solid and titrable acid contents.In conclusion,B.velezensis had better control effect on soft rot of peach fruits,so it had important application value in the field of biological preservative and preservation after harvest of peach fruits.