Responses of radish (<i>Raphanus sativus</i> L.) plants at different growth phases to ozone exposure
Keywords:
Ground level ozone, Ozone injury symptoms, Membrane permeabilityAbstract
Three growth phases of radish (Raphanus sativus var. ‘Pusa chetki’) namely, early vegetative phase (EVP, 20 days); late vegetative phase (LVP, 35 days); and reproductive phase (RP, 50 days) were exposed to two ozone concentrations (75 and 150 ppb) in closed top dynamic chambers for 12 days. Ozone treated plants exhibited visible injuries (white spots mainly on the upper surface of leaves). Significant reductions in shoot length (4 to 35 %), shoot biomass (4 to 62 %), total number of flowers (10 to 44 %), and hypocotyl biomass (40 to 80 %) were also observed. Ozone exposure was more detrimental during EVP compared to LVP and RP. Results of this study also showed that 150 ppb of ozone exerted more harmful effects at all growth phases than 75 ppb.Downloads
Published
How to Cite
Issue
Section
License
Copyright © 2001-11 Kerala Agricultural University. Some rights reserved. This journal and the individual contributions contained in it are protected under copyright by the Kerala Agricultural University and the following terms and conditions apply to their use; Photocopying Single photocopies of single articles may be made for personal use as allowed by national copyright laws. Permission of the publisher and payment of a fee is required for all other photocopying including multiple or systematic copying, copying for advertising or promotional purposes, resale, and all forms of document delivery. Permission may be sought directly from the Editor, Journal of Tropical Agriculture, Department of Agronomy, College of Horticulture,, Kerala Agricultural University, KAU PO, Thrissur 680 656, Kerala, India. (Phone: +91-487-2438325; Fax +91-487-2371040; E-mail: editor.jta@kau.in. Derivative works Subscribers may reproduce tables of contents or prepare lists of articles including abstracts for internal circulation within their institution. Permission of the Publisher is required for resale or distribution outside the institution. Permission of the Publisher is required for all other derivative works, including compilations and translations. Notice No responsibility is assumed by the Publisher for any injury and/or damage to persons or property as a matter of products, liability, negligence, or otherwise, or from any use of any methods, products, instructions or ideas contained in the material herein.