Effect of salt stress on salt accumulation in roots and leaves of two sugarcane genotypes differing in salinity tolerance
Keywords:
Crop physiology, Ca-Na interactions, Na/K ratios, Salinity tolerance, X-ray analysis.Abstract
Soil salinization is one of the main restrictions for sugarcane growth in tropical irrigated agricultural lands. Tolerant genotypes are being used to counteract salinization effects. Mechanisms of salt tolerance include restrictions of ion uptake, and compartmentation of ions outside photosynthetic tissues. We determined the Na to K, S, and Cl ratios using X-ray analysis of individual cells of root and leaf tissues of a salt tolerant genotype, PR692176, and a salt sensitive genotype, V-78-1, as a measure of the relative accumulation of ions resulting from salt treatments using sodium sulphate and sodium chloride. Our results showed that root xylem parenchyma is the region where most Na is retained under salinity, and that this retention is more effective in the salt tolerant genotype. In leaves, mesophyll and bundle sheath parenchymas were the sites for Na accumulation, and the strongest increases in Na/K ratios were observed in the sensitive genotype. Sodium chloride treatment increased Na/K ratios more markedly than sodium sulphate, and for all tissues addition of Ca to the nutrient solution reduced the increase in Na/K ratios induced by both salt treatments.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.