Screening landraces of bread wheat genotypes for drought tolerance in the field and laboratory
Journal Title: International Journal of Farming and Allied Sciences - Year 2014, Vol 3, Issue 3
Abstract
In order to study the response of twenty bread wheat (Triticum aestivum L.) landraces to drought stress two experiments were conducted in the field and laboratory using randomized complete block design and completely randomized design (CRD) with three replications. The field experiment was under rainfed and irrigated conditions during 2010-2011 cropping season. Significant positive correlation was found between grain yield in the stress (Ys) and non-stress (Yp) conditions with mean productivity (MP), geometric mean productivity (GMP), harmonic mean (HM), stress tolerance index (STI), modified stress tolerance index (MSTI), yield index (YI) and stress non-stress production index (SNPI) indicating that these criteria discriminated drought tolerant landraces with high grain yield under stress and nonstress environments (group A). No significant correlation was observed between Ys with tolerance (TOL), abiotic tolerance index (ATI), stress susceptibility percentage index (SSPI), linear regression coefficient (b) and germination stress index (GSI), hence these indicators were not able to identify drought tolerant genotypes (group C). Absence of association between field and laboratory index (germination stress index = GSI) of drought tolerance showed that GSI can not be considered as an early selection criterion for discriminating drought tolerant genotypes. Principal component analysis (PCA) indicated that first and second PCA accounted for 87.72% of variations among the indices. Screening drought tolerant genotypes using mean rank, standard deviation of ranks and biplot analysis, discriminated genotypes Phishtaz , WC-47615 and WC-5050 as the most drought tolerant. Thus, they are recommended for improvement of drought tolerance in common wheat in hybridization programs.
Authors and Affiliations
Ezatollah Farshadfar, Azadahe Sheibanirad and Mohammad Soltanian
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