Bacterial life inside and outside potato roots and leaves
To study the effect of microenvironments on potato-associated bacteria, the abundance and diversity of bacteria isolated from the rhizosphere, phyllosphere, endorhiza and endosphere of field grown potato was analyzed. A total of 2,648 bacteria isolated during a period of two successesive seasons at three different growth stages of potatoes was screened for antagonism towards the plantpathogenic fungi Yerticillium dahliae Kleb. and Rhizoctonia solani Klihn. Antagonistic isolates were identified by FAME and by sequencing the bacterial 16S rDNA. Altogether, 41 antagonistic were identified with 21 of them being typical colonizers of endophytic microenvironments. Richness and diversity indices confinned the specificity of the microenvironments. All 349 antifungal antagonists were characterized by testing their antagonistic mechanisms and plant growth promoting mechanisms in vitro, including glucanolytic, chitinolytic, pectinolytic, cellolytic, and proteolytic activity as well as siderophore and auxin production. Evaluation resulted in the selection of five promising candidates from each microenvironment for biological control.
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