Genetic Evaluation of Bread Wheat for Drought Tolerance Indices in the field and laboratory
Journal Title: Journal of Biodiversity and Environmental Sciences (JBES) - Year 2015, Vol 7, Issue 6
Abstract
In order to study genetic variation and 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 factorial experiment within completely randomized design with three replications, respectively. This experiment was under rainfed and irrigated conditions in Kermanshah, Iran during 2010-2011 cropping season. Result of combined analysis of variance exhibited genotype and environment treatments significantly affect the yield and the most of the traits. The interaction between genotype and environment was significant for grain yield, 1000-grains weight and Chlorophyll total. Germination stress index (GSI) was recorded in the laboratory. Ten quantitative criteria of drought tolerance including: stress susceptibility index (SSI), tolerance index (TOL), mean productivity (MP), geometric mean productivity (GMP), stress tolerance index (STI), yield index (YI), yield stability index (YSI), harmonic mean (HM), relative drought index (RDI) and modified stress tolerance index (MSTI) were calculated for each landrace based on the potential (Yp) and stress (Ys) yields. A significant positive correlation was observed between Ys and Yp with MP, GMP, STI, YI, HM, MSTI indicated that these indices are the most appropriate indices to screen genotypes in drought stress conditions. A positive significant correlation between GSI with Ys and Yp, indicates that GSI can be considered as an early selection criterion for discriminating drought tolerant genotypes. According to all statistical procedures, genotypes No. 20, 18, 19 and 11 are superior genotypes under both stressed and non-stressed conditions.
Authors and Affiliations
Azadeh Sheibanirad, Ezatollah Farshadfar
Keywords
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