the relationship between the stay-green trait and post-flowering drought tolerance in grain sorghum genotypes
Abstract: Thirty restorer lines and twenty cytoplasmic male sterile maintainer B1-lines were screened in field experiment under normal and post-flowering water stress conditions to find out the most drought tolerant genotypes and to investigate the relationship between the stay-green trait and post-flowering drought tolerance. The experiment was conducted at two locations (Sids and south El-Tahreer) in two successive growing seasons, 2001 and 2002 seasons. The water stress regime was normal irrigation until booting stage followed by withholding irrigation until harvest so that the water stress was continues after flowering. Water stress significantly affected most studied traits, namely grain yield, 1000 kernel weight, number of green leaves, leaf area at harvest and stay-green score. Mean squares due to the interactions between genotypes and water treatments were significant for grain yield plant-1 and 1000-kernel weight indicating variation among genotypes in response to water stress regimes.
The simple correlation coefficients between post-flowering drought susceptibility index was negatively associated with grain yield plant-1 (-0.89, P<0.01), 1000 kernel weight (-0.3010, P<0.05), leaf area (-0.5001, P<0.01) and number of green leaves (-0.6006, P<0.01) and positively with stay-green score (0.34, P<0.01). The stay-green score was negatively correlated with grain yield plant-1 ( 0.77, P<0.01), 1000 kernel weight (-0.10, P= 0.48), leaf area (-0.40, P<0.01) and number of green leaves ( 0.609). Since the stay-green score expresses the senescence rate, the useful effect of stay-green on grain yield under water stress was indicated by a considerable negatively significant correlation coefficient. So the lowest stay-green score and lowest senescence rate gives the highest grain yield under post-flowering water stress conditions.
A highly significant correlation (0.7369, P<0.01) between stay-green and susceptibility index indicates the important role of stay-green in identifying post-flowering drought tolerant genotypes. The stay-green was responsible for about 0.543% of the variation in drought tolerance. However, other factors appear to contribute to drought tolerance.
Publication year 2003
Pages 271-283
Availability location معهد بحوث المحاصيل الحقلية – 9 شارع الجامعة – الجيزة
Availability number
Organization Name
serial title مجلد المؤتمر الثالث لتربية النبات-الجيزة 26 أبريل 2003
Author(s) from ARC
Agris Categories Agriculture - General aspects
AGROVOC
TERMS		 Sorghum bicolor.
Publication Type Conference/Workshop
↑