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ROLE OF ABSCISIC ACID AND PROLINE IN SALINITY TOLERANCE OF WHEAT GENOTYPES
Abstract
Wheat genotypes were evaluated for salinity tolerance under 3 diverse environments of Yar Hussain, Baboo Dehari (District Swabi KPK Pakistan) and Khitab Koroona (District Charsadda KPK Pakistan). Eleven genotypes (Local, SR-24, SR-25, SR-7, SR-22, SR-4, SR-20, SR-19, SR-2, SR-23 and SR-40) were tested for their salinity tolerance. These locations had different salinity profile (i.e. Yar Hussain, EC. 3-3.5 dS m-1; Baboo Dehari, EC. 4-4.5 dS m-1 and Khitab Koroona, EC. 5-5.30 dSm-1). Different locations and wheat genotypes had a significant (p < 0.05) effect on endogenous shoot proline, shoot ABA (3, 6 and 9 weeks after emergence) and straw yield. Maximum endogenous shoot proline and ABA levels (3, 6 and 9 weeks after emergence) were recorded in genotype SR-40 followed by genotype SR-23. The results further indicated that minimum endogenous shoot proline and ABA concentrations (3, 6 and 9 weeks after emergence) were recorded at Yar Hussain. Maximum endogenous shoot proline and ABA concentration (3, 6 and 9 weeks after emergence) were observed at Khitab Koroona.
