辣椒疫病生防放线菌筛选及其对辣椒根系微生物区系的影响

为了获得对辣椒疫病具有实际防效的生防放线菌菌株,在盆栽条件下检验了108株辣椒疫霉拮抗放线菌对辣椒疫病的防病和促生作用,并对拮抗菌接种后土壤和辣椒根系微生物区系的影响进行了研究。结果表明,经无菌土纸钵初筛和未灭菌自然土盆栽复筛试验,从108株辣椒疫霉拮抗放线菌中筛选出2株防效最佳的拮抗放线菌0108和0110。在盆栽条件下,接种0108和0110拮抗放线菌14 d后相对防效分别达到75%和81%,21 d后相对防效分别达到65%和56%,且2株拮抗放线菌都能通过影响辣椒根系微生物数量控制辣椒疫霉菌的生长繁殖,降低辣椒疫霉对根系的侵染,并对辣椒根系生长有显著促进作用。

Screening bio-control actinomycetes to control pepper phytophthora blight and the impact of microbial population of pepper's rhizosphere

In order to gain the effective value of bio-control agents of actinomycetes to control pepper phytophthora blight,108 strains of antagonism actinomycetes against Phytophthora capsici were tested for disease control and promotion value under green house condition,and the effect of the microbes quantities of pepper's rhizosphere and soil was studied after inoculated antagonism actinomycetes.The result showed that 2 strains(0108 and 0110) were screened out via sterile soil and natural soil in pot experiments which had better control effect to pepper phytophthora blight.Their relative control efficiency was 75% and 81%,respectively,in the 14 d.and were 65% and 56%,respectively,in the 21 d after inoculated strain 0108 and 0110.They both obviously impacted the soil microorganism population to control the development and reproduction of Phytophthora capsici in different part of pepper roots,reduce infection of ytophthora capsic to the pepper roots,and promote the growth of pepper roots.