PJB-2017-622
MORPHOLOGICAL SCREENING AND SELECTION OF SYNTHETIC WHEATS AND THEIR DERIVATIVES TARGETED FOR SALT TOLERANCE
Rabia Masood
Abstract
Salinity is a major constraint to global wheat productivity and food security, especially in the arid and semi-arid regions of the world. In order to develop high yielding crop varieties for saline agriculture, identification and selection of novel sources of salt tolerant germplasm is essential. In this study we have evaluated one hundred and thirty six synthetic wheat and their derivatives including four check cultivars under control and 150mM NaCl salt stress in greenhouse condition for various morpho-physiological and yield related traits. Descriptive statistics and analysis of variance showed significant amount of variations among all the recorded observations at vegetative and maturity stage. Sodium ions showed negative correlation while potassium ions showed positive correlation with various traits under salt stress. In principal component analysis first six principal components having eigenvalues > 1.0 cumulatively accounted for 69.64% of total variations under control while first five principal components having eigenvalues > 1.0 cumulatively accounted for 75.76% of total variations under salt stress among wheat genotypes. Hierarchical cluster analysis grouped all genotypes into five and three major clusters under control and stress treatments respectively. Synthetic wheats with same durum (AABB) were found in both tolerant and susceptible groups which indicate that salt tolerance is contributed by Aegilops tauschii (DD). Wheat genotypes were categorised on the basis of stress tolerance index for yield related traits into four groups as forty one were grouped into tolerant, fifty seven moderately tolerant, eighteen moderately susceptible and twenty genotypes into susceptible. Selected potential genotypes could be utilised for incorporations of novel genes and development of salt tolerant varieties into bread wheat improvement program.
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