RELATIONSHIP BETWEEN ROOT COLONIZATION AND SUPPRESSION OF GAEUMANNOMYCES-GRAMINIS VAR TRITICI BY PSEUDOMONAS-FLUORESCENS STRAIN 2-79
RELATIONSHIP BETWEEN ROOT COLONIZATION AND SUPPRESSION OF GAEUMANNOMYCES-GRAMINIS VAR TRITICI BY PSEUDOMONAS-FLUORESCENS STRAIN 2-79
复制标题
DOI：
10.1094/phyto-81-954
复制
发表时间：
1991-09-01
期刊：
影响因子：
3.2
通讯作者：
THOMASHOW, LS
中科院分区：
文献类型：
--
作者：
BULL, CT;WELLER, DM;THOMASHOW, LS
荧光假单胞菌2- 79 RN 10产生抗生素吩嗪-1-羧酸（Phz+），是小麦全蚀病的生防剂。 本研究表明2- 79 RN 10的根定殖与全蚀病的生物防治之间存在正相关。 在自然土壤中，无论是感染或未感染禾全囊壳变种。在小麦根上检测到的2- 79-RN 10（Phz+）、2-79-B46（吩嗪缺陷型，Phz-）和2-79-B46 R（遗传恢复型，Phz+）的群体大小与施加到种子上的细菌剂量直接相关。 此外，2- 79-RN 10和2-79-B46 R在小麦种子和根系上的种群数量以及G. G.与种子根的生长呈负相关。 本研究还首次证实了吩嗪-1-羧酸是抑制G. G.由于菌株2-79-B46不能抑制病斑形成，因此在根部初次感染期间没有抑制。 菌株2-79-B46在种子或根系上的种群数量与根斑数量之间不存在负相关。
Pseudomonas fluorescens 2-79RN10 produces the antibiotic phenazine-1-carboxylic acid (Phz+) and is a biocontrol agent of take-all of wheat. This study demonstrated a positive relationship between root colonization by 2-79RN10 and biological control of take-all. In natural soil, either infested or not infested with Gaeumannomyces graminis var. tritici, the population sizes of 2-79RN10 (Phz+), 2-79-B46 (phenazine deficient, Phz-), and 2-79-B46R (genetically restored, Phz+) detected on wheat roots were directly related to the dose of bacteria applied to the seed. Furthermore, the population size of 2-79RN10 or 2-79-B46R on wheat seeds and roots and the number of lesions formed by G. g. tritici on seminal roots were inversely related. This study also demonstrated for the first time that phenazine-1-carboxylic acid is a major factor in suppression of G. g. tritici during primary infection of roots because strain 2-79-B46 failed to suppress lesion formation. No inverse correlation occurred between the population size of strain 2-79-B46 on seeds or roots and the number of root lesions.