Biochemical factors governing resistance in diploid cotton against grey mildew
233 / 276
Authors
-
P.K. CHAKRABARTY, P.M. MUKEWAR, SHEO RAJ and V. SRAVAN KUMAR
Keywords:
Gossypium spp., grey-mildew, Ramularia areola, biochemical resistanceAbstract
Six cotton lines possessing different degrees of resistance to grey-mildew (Ramularia areola) were used to study the biochemical basis of resistance. These included one immune (G 135-49), three resistant (Desi 1, AC 24 and 30821) and a universal susceptible cultivar (AKH 4), from Gossypium arboreum besides, a susceptible cultivar Jayadhar belonging to G. herbaceum. Induced rather than constitutive levels of phenylalanine ammonia lyase (PAL), total phenol, gossypol and flavonols played crucial role in governing resistance. The magnitude of induction was invariably higher in resistant lines than in the susceptible plants. Besides, the ability of resistant plants to prevent greater loss in PAL, phenolics, proline and total sugar upon infection appeared important for resistance. Resistant plants also possessed higher levels of constitutive as well as induced tannins and constitutive proline. Amino acid and carbohydrate metabolism of the healthy and diseased plants did not directly reveal the significance of these constituents in resistance except that they were remarkably reduced as a result of infection.
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.