Suppression of plant defence response by a mycorrhiza helper bacterium
Suppression of plant defence response by a mycorrhiza helper bacterium
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DOI：
10.1111/j.1469-8137.2007.02021.x
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发表时间：
2007-01-01
期刊：
影响因子：
9.4
通讯作者：
Tarkka, Mika T.
中科院分区：
文献类型：
--
作者：
Lehr, Nina A.;Schrey, Silvia D.;Tarkka, Mika T.
本研究的目的是确定菌根辅助细菌链霉菌是否。 AcH 505 可作为异担子根腐病和根腐病的生物防治剂。细菌对异担子菌菌丝生长的影响。分离株在木盘和挪威云杉 (Picea abies) 根上的定殖进行了测定。研究了 AcH 505 对植物光合作用、过氧化物酶活性和基因表达以及针感染的影响。AcH 505 对 12 种测试的真菌异担子分离株中的 11 种具有拮抗作用。这种拮抗作用抑制了挪威云杉根和木盘上的真菌定殖。第 12 株 Heterobasidion abietinum 331 的菌丝生长速率不受 AcH 505 的影响，AcH 505 促进了该真菌菌株在根部的定植。细菌接种导致根部过氧化物酶活性和基因表达水平降低。AcH 505 促进异担子菌株在植物根部定植，这些菌株对由菌株产生的抗真菌代谢物具有耐受性。细菌。这可能是由于抑制植物防御反应的未知细菌因素造成的。
The aim of the present study was to determine whether the mycorrhiza helper bacterium Streptomyces sp. AcH 505 could serve as a biocontrol agent against Heterobasidion root and butt rot.Bacterial influence on mycelial growth of Heterobasidion sp. isolates, on the colonization of wood discs and Norway spruce (Picea abies) roots was determined. The effect of AcH 505 on plant photosynthesis, peroxidase activity and gene expression, and needle infections were investigated.AcH 505 was antagonistic to 11 of 12 tested fungal Heterobasidion isolates. The antagonism resulted in a suppression of fungal colonization of Norway spruce roots and wood discs. Mycelial growth rate of the 12th strain, Heterobasidion abietinum 331 was not affected by AcH 505, and colonization of roots by this fungal strain was promoted by AcH 505. Bacterial inoculation led to decreased peroxidase activities and gene expression levels in roots.AcH 505 promotes plant root colonization by Heterobasidion strains that are tolerant to antifungal metabolites produced by the bacterium. This may result from unknown bacterial factors that suppress the plant defence response.