Secondary metabolites of cotton rhizobacteria in the suppression of bacterial blight of cotton
232 / 202
Authors
-
K.K. MONDAL, R.P. SINGH, P. DUREJA and J.P. VERMA
Divison of Plant Pathology and Division of Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi 110 012
Keywords:
Pseudomonas, biocontrol, cotton, rhizosphere, secondary metabolite, bacterial blightAbstract
Five cotton rhizobacteria (CRb), antagonistic to race 32 of Xanthomonas axonopodis pv. malvacearum (Xam R-32), identified as Pseudomonas alcaligenes (CRb-9 and CRb-14), P. fluorescens (CRb-26 and CRb-39) and P. putida (CRb-17), were screened for theproduction of antimicrobial secondary metabolites including HCN and siderophores. CRb-26 was the most efficient producer of HCN and siderophore (catecholate group). Four major phenolic compounds tentatively designated I, II, III and IV were extracted from the cell-free culture filtrate of CRb-26; compound IV, which was produced maximally, co-chromatographed with 2,4 diacetylphloroglucinol. Compounds I and IV were fluorescent while II and III were non-fluorescent. Compounds II and IV completely inhibited the growth of Xam R-32 at 200 and 100 鎔/ml, respectively, in vitro; these two compounds also protected cotton (Gossypium hirsutum cv. Acala-44 and G. barbadense cv. 16-14-6) plants from bacterial blight.
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.