Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 7-Day Trial for You or Your Team.

Learn More →

The involvement of the transpirational bypass flow in sodium uptake by high‐ and low‐sodium‐transporting lines of rice developed through intravarietal selection

The involvement of the transpirational bypass flow in sodium uptake by high‐ and... ABSTRACT We report the characterization of high‐ and low‐sodium‐transporting lines developed by intravarietal selection within a cultivar, IR36, of rice (Oryza sativa L.). The purpose was to investigate the mechanistic basis of sodium uptake in material in which differences in salt uptake could be isolated from the many other morphological and physiological characteristics that affect the phenotypic expression of salt tolerance. The lines differed in mean sodium transport by a factor of 2. They differed in vigour and water use efficiency, which are characters that modify the effects of salt transport, by only 12% or 13%. The lines did not differ significantly in other physiological traits that are components of salt resistance: compartmentalization at the leaf and cellular levels. There was a strong correlation between the transport of sodium and a tracer for apoplastic pathways (trisodium, 3‐hydroxy‐5,8,10‐pyrene trisulphonic acid, PTS) in both lines. The regression coefficient for sodium transport on PTS transport was the same in both lines. The individual variation in PTS transport was similar to that in sodium transport, and the variation in the transport of both was very much greater than the variation in any other character studied. The high‐sodium‐transporting line took up proportionately more PTS than the low‐sodium‐transporting line. It is concluded that the transpirational bypass flow is of major importance in sodium uptake by rice and that selection for differences in sodium transport has been brought about by selection for heritable differences in the bypass flow. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Cell & Environment Wiley

The involvement of the transpirational bypass flow in sodium uptake by high‐ and low‐sodium‐transporting lines of rice developed through intravarietal selection

YADAV, R.; FLOWERS, T. J.; YEO, A. R.
Plant Cell & Environment , Volume 19 (3) – Mar 1, 1996
Download PDF
9 pages

Loading next page...
 
/lp/wiley/the-involvement-of-the-transpirational-bypass-flow-in-sodium-uptake-by-fc0TgQV34P

References (30)

Publisher
Wiley
Copyright
Copyright © 1996 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0140-7791
eISSN
1365-3040
DOI
10.1111/j.1365-3040.1996.tb00255.x
Publisher site
See Article on Publisher Site

Abstract

ABSTRACT We report the characterization of high‐ and low‐sodium‐transporting lines developed by intravarietal selection within a cultivar, IR36, of rice (Oryza sativa L.). The purpose was to investigate the mechanistic basis of sodium uptake in material in which differences in salt uptake could be isolated from the many other morphological and physiological characteristics that affect the phenotypic expression of salt tolerance. The lines differed in mean sodium transport by a factor of 2. They differed in vigour and water use efficiency, which are characters that modify the effects of salt transport, by only 12% or 13%. The lines did not differ significantly in other physiological traits that are components of salt resistance: compartmentalization at the leaf and cellular levels. There was a strong correlation between the transport of sodium and a tracer for apoplastic pathways (trisodium, 3‐hydroxy‐5,8,10‐pyrene trisulphonic acid, PTS) in both lines. The regression coefficient for sodium transport on PTS transport was the same in both lines. The individual variation in PTS transport was similar to that in sodium transport, and the variation in the transport of both was very much greater than the variation in any other character studied. The high‐sodium‐transporting line took up proportionately more PTS than the low‐sodium‐transporting line. It is concluded that the transpirational bypass flow is of major importance in sodium uptake by rice and that selection for differences in sodium transport has been brought about by selection for heritable differences in the bypass flow.

Journal

Plant Cell & Environment – Wiley

Published: Mar 1, 1996

There are no references for this article.