Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
Pakistan Journal of Biological Sciences
Year: 2000  |  Volume: 3  |  Issue: 10  |  Page No.: 1639 - 1643

Response of Wheat to Combined High Temperature an Osmotic Stress During Maturation. II. Plant Water Relations

Nazeer Hussain Shah and Gary M. Paulsen    

Abstract: High temperature and drought affect plant processes individually and may interact to alter water relations. Our objectives were to ascertain the effect of high temperature and osmotic stress and to identity interactions between them on water relation of wheat (Triticum aestivum L. cv. Len). Plants that were grown uniformly until anthesis were subjected to 15/10, 25/20 or 35/30°C and -0.01 or 0.41 Mpa water stress and were sampled weekly until maturity. Relative water content (RWC) of flag leaves remained constant at low temperature and declined quickly at high temperature. Osmotic stress decreased RWC slowly at low temperature and rapidly at high temperature as plants matured. Water potential and osmotic potential reacted similarly, staying high at low temperature and falling faster as the temperature increased or osmotic stress impinged. Turgor potential was sometimes higher under 15/10°C with osmotic stress than under other regimes, but varied lesser than other pressure components. Cumulative water use ranked 25/20 >15/10 >35/30°C without osmotic stress >15/10°C = 25/20°C = 35/30°C with osmotic stress. Water use efficiency for grain mass was reduced by high temperature and increased by osmotic stress. Results demonstrated that high temperature and osmotic stress interact by complementary effect on water relations and beneficial effects of low temperature on osmotic adjustment to stress.

Cited References   |    Fulltext    |   Related Articles   |   Back
   
 
 
 
  Related Articles

 
 
 
 
 
 
 
 
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility