Paper Details

Combining ability analysis in sunflower hybrids under water stress condition

Mehdi Mohyaji, Mohammad Moghaddam, Mahmoud Toorchi, Mostafa Valizadeh

DOI: https://dx.doi.org/10.12692/ijb/5.12.364-373

Int. J. Biosci. 5(12), 364-373. December, 2014. (PDF)

Abstract:

This study was conducted to evaluate combining ability for yield, agronomic and physiological traits through line × tester analysis with 30 hybrids, developed from five testers and six lines, at three water regimes. The experiment was conducted as split plot design based on randomized complete blocks for two years. Data analysis showed that GCA of lines were significant for seed yield, number of seeds per head, head diameter, plant height, and relative water content (RWC), respectively. GCA for testers was only significant for RWC. SCA of all traits, except leaf temperature, were significant. GCA and SCA estimates were obtained on the average of water regimes and years. Highest positive GCA for testers belonged to R50 for yield, number of seeds per head, 100 seed weight, head diameter, and plant height which were 4.28, 62.31, 0.18, 0.45, and 6.47, respectively. Line A329 had the highest positive GCA for yield and number of seeds per head (3.95 and 63.78, respectively), but the highest negative GCA (-2.79) for RWC. Cross R50 × A329 had the highest positive SCA for yield, number of seeds per head, and RWC which were 9.25, 138.66 and 3.71, respectively. The results showed high narrow sense heritability and incomplete dominance for all characters except leaf temperature.  These results showed the potential for producing improved cultivars in sunflower under normal and water deficit conditions.