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首页> 外文期刊>Acta Agriculturae Scandinavica. Section B, Soil and Plant Science >Potential of indigenous antagonistic rhizobacteria in the biological control of Monosporascus root rot and vine decline disease of muskmelon
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Potential of indigenous antagonistic rhizobacteria in the biological control of Monosporascus root rot and vine decline disease of muskmelon

机译：土着拮抗性根瘤菌在麝香豆孢子根腐烂生物控制中的潜力

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摘要

Monosporascus root rot and vine decline (MRVD) of muskmelon, caused by Monosporascus cannonballus, is an economically important disease worldwide. The objectives of this study were to isolate native rhizobacterial strains and to evaluate their ability to promote plant growth and to provide protection against M. cannonballus. Thirty eight native bacterial isolates from the rhizosphere soil of muskmelon and cucumber were screened for their antagonism against M. cannonballus in a dual culture assay. Among them, five isolates viz., Bacillus amyloliquefaciens (B4), Pseudomonas mendocina (B7), Bacillus endophyticus (B10), Pseudomonas resinovorans B11 and P. aeruginosa AT3, identified based on the 16S rRNA gene sequence analysis, showed a significant level of antagonism and the inhibition zone ranged from 5.6 mm to 25.9 mm. Scanning electron microscopic observation of the hyphae of M. cannonballus at the inhibition zone revealed morphological abnormalities including shrinkage, loss of turgidity, pit formation and deformation. These bacterial isolates showed compatibility with one another and with Trichoderma viride. Greenhouse experiments revealed that P. resinovorans B11 was the most effective among the bacterial antagonists in controlling MRVD in melon. When applied as seed treatment and soil application, P. resinovorans B11 reduced the incidence of MRVD by 93.1%, relative to the infected control.
机译：由MonoSporcus Cannonballus引起的Musopor Scus Root和Vine Dress（MRVD）是全球经济上重要的疾病。本研究的目的是分离天然的根瘤菌菌株并评估它们促进植物生长和对M. Carmonballus的保护的能力。来自穆斯克莫朗和黄瓜根际土壤的三十八个原生细菌分离株，对其在双重培养测定中对抗M. Cannonballus的拮抗作用。其中，五分离物，芽孢杆菌氨基吡喹酮（B4），甲硝酸甘露胺（B7），芽孢杆菌内炎（B10），假单胞菌树脂素B11和P.铜绿假单胞菌AT3，基于16S rRNA基因序列分析鉴定，显示出显着的水平拮抗作用和抑制区的范围为5.6毫米至25.9毫米。扫描电子显微镜观察抑制区的M. Cannballus Quphae揭示了形态异常，包括收缩，脾脏丧失，坑形成和变形。这些细菌分离株与彼此相容和Trichoderma Viride表示。温室实验表明，P.树脂OVORANS B11是在甜瓜控制MRVD的细菌拮抗剂中最有效的。当作为种子处理和土壤应用时，P.树脂Ovorans B11相对于受感染的对照将MRVD的发生率降低了93.1％。

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