LP3,LP5杆菌的防病作用及其对梨幼苗的促生效应

测定了内生芽孢杆菌LP3,LP5菌株对梨采收后果黑斑病的预防和治疗效果,并通过盆栽试验分析了这2个菌株对梨幼苗的促生效应。结果表明,LP3,LP5对9种病原菌的抑制率分别在42.3%～87.3%和45.6%～92.6%之间;其对梨黑斑病兼具预防和治疗作用,经LP3,LP5发酵液处理的梨果接病菌5 d后,防效分别为81.53%,88.92%;LP3,LP5处理病果3 d后,病斑扩展抑制率分别达65.64%和72.48%;LP3,LP5能促进梨树幼苗的生长,经这2个菌株处理的梨树幼苗初生枝长度分别比对照提高了50.48%和21.83%,鲜质量分别比对照增加35.67%,31.16%,干质量分别比对照增加29.24%,20.75%。

Disease Prevention and Growth Promotion Effects in Pear Seedlings of Endophytic Bacillus Strains LP3 and LP5

The preventive and therapeutic effects of endophytic bacillus strains LP3 and LP5 against black spot disease in postharvest of pear fruits were determined,and the growth-promotion of 2 strains to pear seedlings was analyzed through pot experiments.The results showed that the inhibition rates of 2 strains against 9 phytopathogenic fungi were 42.3%～87.3% and 45.6%～92.6%,respectively.And the 2 strains had both protection and control activities to black spot disease of pear.The control efficiency of LP3 and LP5 strains in the 5 d after inoculating Alternaria kikuchiana were 81.53% and 88.92% respectively,and the inhibition rates on lesion expansion were 65.64% and 72.48% respectively on the 3th day after the black spots diseases of pear were treated by strain LP3 and LP5;the strain LP3 and LP5 could significantly promote pear seedlings growth.The length of new branch increased 50.48% and 21.83% after treatment by strain LP3 and LP5 fermentation broth,respectively.And the plant height and dry weight of pear seedlings increased by 35.67%,31.16% and 29.24%,20.75% than the control group,respectively.