Affiliation:
1. Centre of Advanced Study in Botany, University of Madras, Guindy, Madras 600 025, India
Abstract
Pseudomonas fluorescens
strains antagonistic to
Sarocladium oryzae
, the sheath rot (Sh-R) pathogen of rice (
Oryza sativa
L.), were evaluated in greenhouse and field tests for suppression of Sh-R severity and enhancement of grain yields of rice. Imprints of rice seedlings and a direct-observation technique of staining roots with fluorochromes confirmed the association of
P. fluorescens
with roots and the ability of the strain to move along shoot tips. In greenhouse tests,
P. fluorescens
-treated rice plants (cv. IR 20) showed a 54% reduction in the length of Sh-R lesions. In three field tests, treatment with
P. fluorescens
reduced the severity of Sh-R by 20 to 42% in five rice cultivars. Bacterization of rice cultivars with
P. fluorescens
enhanced plant height, number of tillers, and grain yields from 3 to 160%.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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