3 research outputs found
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Not AvailableAbiotic stresses are major constraints to wheat productivity in many parts of the world.
Tolerance to abiotic stresses can be achieved indirectly by selection for morpho-physiological
traits. Physiological trait based breeding has been associated with improved performance
under stress; and hence can combat and adapt wheat to drought and heat stress. Therefore,
in the present study, phenotyping was carried out for agro-physiological traits in 52 diverse
wheat germplasm lines under timely sown, rainfed and late sown environments for two
years. Mean yield of the genotypes over the six environments were positively correlated with
NDVI, days to maturity and negatively correlated with canopy temperature. The phenotypic
data validated marker-trait associations of a number of meta-QTLs identified earlier for different
physiological and agronomic traits. Six and seven meta-QTL genomic regions were
found to be consistent in their expression for two years under rainfed/restricted irrigation and
late sown environments, respectively. Expression analysis of the underlying candidate gene
AK248593.1 in meta-QTL26 region revealed two folds higher expression in the NILs carrying
the co-localized SSR markers. The linked markers of the thirteen meta-QTL regions
associated with different traits can be used for effective transfer of the QTLs through
marker assisted selection in wheat breeding programmes.ICAR:IAR