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Wheat is used as a staple diet by most of the people in Pakistan. It is cultivated on irrigated along-with rain-fed areas throughout
the country. During wheat growing period Pakistan receives low rainfall as occasional showers, which is insufficient to mature
the crop amicably thus putting the pressure on the limited canal and marginally fit ground water application. Subsequently crop
yield is reduced due to the effects of moisture deficiency stress at various developmental stages. This situation demands the
evolution of wheat genotypes showing improvements in different morpho-physiological traits suitable for water deficiency
stress tolerance. For this purpose, combining ability studies help the breeders to recognize the best parental genotypes and their
crosses. By employing line × tester mating design, eight lines and four testers were used to obtain thirty-two crosses. During
November 2013 the seeds of crosses along with parents were planted in the field and data were collected for yield and water
deficiency stress tolerance related traits. The combining ability effects analysis revealed that parents WN-66, WN-85, WN104, GA-2002 and Lasani-2008 proved to be good general combiners for grain yield under water deficiency stress and nonstress environments. Similarly, WN-85, WN-104, WN-105 and Lasani-2008 showed lowest GCA values for relative cell injury
percentage. The highest SCA values for grain yield were shown by the hybrids WN-66 × Lasani-2008, WN-66 × Uqab-2000
and WN-78 × GA-2002. The crosses WN-105 × Uqab-2000, WN-66 × Lasani-2008 and WN-114 × Lasani-2008 showed the
lowest SCA values for relative cell injury percentage. These parents and their hybrids showing good GCA and SCA values
could be used in wheat breeding programs focusing on yield improvements under water deficiency stress environments.
Rana Arif Manzoor Khan, Abdus Salam Khan, Faisal Saeed Awan, Hafeez Ahmad Sadaqat . (2020) COMBINING ABILITY ASSESSMENTS OF SOME MORPHOPHYSIOLOGICAL TRAITS FOR IMPROVED GRAIN PRODUCTION IN BREAD WHEAT UNDER WATER DEFICIT STRESS CONDITIONS, Pakistan Journal of Agricultural Sciences, Volume 57, Issue 4.
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