Population dynamics of cotton endophytic Pseudomonas, their antagonism and protective action against the major pathogens of cotton
415 / 227
Authors
-
B. BHOWMIK, R.P. SINGH, J. JAYARAMAN* and J.P. VERMA
Keywords:
Endophytes, Pseudomonas f/uorescens, Rhizoctonia so/ani, Sclerotium ro/fsii, cotton blight, damping off, Xanthomonas campestris pv. malvacearumAbstract
Five pseudomonads (non fluorescent and fluorescent) out of fifty isolates of endophytic bacteria isolated from root and stem of green-house grown healthy cotton seedlings were found antagonistic to Rhizoctonia solani and Sclerotium rolfsii which cause damping off disease and Xanthomonas campestris pv. malvacearum (Xcm). Two isolates (viz. Endo PR4 and Endo PR8) identified as Pseudomonas fluorescens multiplied efficiently in root, stem and leaves of cotton at various growth stages. Following seed bacterisation, the population of endophytes kept on increasing upto 15 days after seedling emergence, which is considered the active phase during which the plants/ seedlings are infected. Seed bacterisation with one of the endophytes (Endo PR8) reduced damping off disease incidence caused by R.solani and S.rolfsii by 84% and 76% respectively. Following injection infiltration technique in leaves, both the isolates reached their peak population at 8-24h. There was no strict host specificity of endophytes as far as their colonisation ability was concerned. Seed bacterisation with endophytes showed that Endo PR8 was the most effective isolate to reduce the cotyledonary infection by Xcm; the per cent protection of cotyledonary infection varied from 53.3 (unsterilised soil) and 60.0 (in sterilised soil).
Downloads
Issue
Section
License
For Authors
As soon as an article is accepted for publication, authors are requested to assign copyright of the article (or to grant exclusive publication and dissemination rights) to the publisher (Indian Phytopathlogical Society). This will ensure the widest possible protection and dissemination of information.
For Readers
While the advice and information in this journal is believed to be true and accurate at the date of its publication, the authors, the editors, nor the publisher can accept any legal responsibility for any errors or omissions that may have been made. The publisher makes no warranty, express or implied, with respect to the material contained herein.
All articles published in this journal are protected by copyright, which covers the exclusive rights to reproduce and distribute the article (e.g., as offprints), as well as all translation rights. No material published in this journal may be reproduced photographically or stored on microfilm, in electronic data bases, on video disks, etc., without first obtaining written permission from the publisher. The use of general descriptive names, trade names, trademarks, etc. in this publication, even if not specifically identified, implies that these names are protected by the relevant laws and regulations.