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Rhizobacteria of Cotton and Their Repression of Seedling Disease Pathogens

机译：棉花根际细菌及其对幼苗病害病原菌的抑制

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摘要

During the 1983 field season, the rhizobacteria (including organisms from rhizosphere soil and the root rhizoplane) of cotton plants at one location in Mississippi were inventoried at different plant growth stages. Isolates (1,000) were identified to the genus level and characterized for repression of Pythium ultimum and Rhizoctonia solani. Cotton seedlings were initially colonized by bacteria of many different genera, and populations quickly reached 108 CFU/g of root tissue. As the season progressed, the bacterial populations declined as root mass increased and the roots became more woodlike in consistency. Fluorescent pseudomonads were the most numerous gram-negative rhizobacterial isolates of those that were randomly collected and identified, and they provided the largest number of isolates with fungal repressive activity. Several other gram-negative bacterial genera were recovered throughout the growing season, and some gram-positive bacteria were also isolated routinely, but at lower numbers. There was no correlation between the proportion of rhizobacterial isolates that possessed fungal repressive activity and the plant growth stage from which the isolates were obtained. Approximately twice as many bacterial isolates demonstrated fungal repression in the agar assay compared with the inplanta assay, and isolates were found more frequently with fungal repressive activity against P. ultimum than against R. solai.
机译：在1983年的田间季节中，在密西西比州一个地点的棉花植物的根际细菌（包括来自根际土壤和根系根际的生物）在不同的植物生长阶段进行了清查。分离物（1,000）被鉴定到属水平，并被表征为能抑制终极腐霉和茄根霉。棉花幼苗最初是由许多不同属的细菌定殖的，种群数量迅速达到根组织的10 8 CFU / g。随着季节的进行，细菌的数量随着根质量的增加而减少，并且根的稠度变得更像木头。荧光假单胞菌是随机收集和鉴定的革兰氏阴性根瘤菌中数量最多的菌株，它们提供了具有真菌抑制活性的最大菌株。在整个生长季节中还发现了其他几个革兰氏阴性细菌属，也常规分离了一些革兰氏阳性细菌，但数量较少。具有真菌抑制活性的根瘤菌分离物的比例与从中获得分离物的植物生长阶段之间没有相关性。与琼脂测定法相比，琼脂测定法中分离出的细菌分离物的真菌抑制率约为两倍，发现分离株对终极腐殖质的抑制作用要比对茄霉的抑制作用高。

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