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首页> 外文期刊>Plant and Soil >Screening for plant growth-promoting rhizobacteria in Chamaecytisus proliferus (tagasaste), a forage tree-shrub legume endemic to the Canary Islands
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Screening for plant growth-promoting rhizobacteria in Chamaecytisus proliferus (tagasaste), a forage tree-shrub legume endemic to the Canary Islands

机译：在加那利群岛特有的牧草灌木豆科植物Chamaecytisus proliferus（tagasaste）中筛选促进植物生长的根际细菌

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摘要

Rhizobacteria with properties related to plant growth-promotion were isolated from the rhizosphere of the perennial legume Chamaecytisus proliferus ssp. proliferus var. palmensis (tagasaste) growing in field conditions. Samples were collected in two localities of the Tenerife Island: La Laguna and El Tanque, NE and NW at 600 and 1000 meters above sea level, respectively, and in two seasons, winter and summer. The strains were isolated by using culture dependent procedures, and identified by phenotypic (culturable and biochemical) and genotypic (ERIC-PCR fingerprinting) features. The rhizosphere isolates formed a diverse community of mainly Gram-negative bacteria, with members of genera Pseudomonas, Burkholderia and Sphingomonas being predominant. A high level of selectivity was found in the rhizosphere environment as compared to the non-rhizosphere soil where Gram-positives were more abundant. Species richness (number of species) and species abundance were related to the sampling season and the locality, thus, samples obtained in winter at both sites had larger counts than samples obtained in summer, and the higher species richness was found in La Laguna. The species Pseudomonas fluorescens showed the highest number of properties related to plant growth promotion (PGP): 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity, phytohormone production, nitrogen fixation, fungal growth inhibition and cyanogenesis, thus it seems to be the most suitable microorganism to be tested in PGP-field experiments.
机译：从多年生豆科植物Chamaecytisus proliferus ssp的根际中分离出具有与植物生长促进有关的特性的根际细菌。增生变种在田间条件下生长的palmensis（tagasaste）。特内里费岛的两个地方分别在海拔600和1000米的两个季节（冬季和夏季）分别在La Laguna和El Tanque，NE和NW采集了样品。通过使用依赖于培养的程序分离菌株，并通过表型（可培养和生化）和基因型（ERIC-PCR指纹图谱）特征进行鉴定。根际分离物形成了主要由革兰氏阴性细菌组成的多样化群落，其中假单胞菌属，伯克霍尔德氏菌和鞘氨醇单胞菌属的成员占主导。与革兰氏阳性菌含量较高的非根际土壤相比，在根际环境中发现了较高的选择性。物种丰富度（物种数）和物种丰富度与采样季节和地点有关，因此，在两个地点冬季采集的样品数量要比夏季采集的样品数量大，而拉古纳的物种丰富度更高。荧光假单胞菌（Pseudomonas fluorescens）物种显示出与植物生长促进（PGP）相关的最大数量的特性：1-氨基环丙烷-1-羧酸盐（ACC）脱氨酶活性，植物激素生成，固氮，真菌生长抑制和生氰，因此似乎是最适合在PGP现场实验中测试的微生物。

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