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University of Agricultural Sciences, Dharwad (2007)

Genetics of drought tolerance in durum wheat (triticum aestivum desf.)

Giriyappanawar Santosha A.

Titre : Genetics of drought tolerance in durum wheat (triticum aestivum desf.)

Auteur : Giriyappanawar Santosha A.

Université de soutenance : University of Agricultural Sciences, Dharwad

Grade : Master of Science (MS) in Genetics and Plant Breeding 2007

Résumé
A study was conducted during rabi 2006-07, at Wheat Improvement Project, MARS, University of Agricultural Sciences, Dharwad to study the genetics of drought tolerance in Durum wheat (Triticum durum Desf.). Investigation was carried out on variability correlation and path analysis for morphophysiological characters viz, Field Emergence %, Days to 50 per cent flowering, Days to maturity, Spike length, Plant height, Number of spikelets per spike, Number of effective tillers per plant, Number of grains per spike, Grain yield (g/plot), 1000 Grain weight, Harvest Index, Stress susceptibility index and seedling characters viz, Coleoptile length, Root length, Shoot length, Root to shoot length ratio. 25 genotypes were grown under two environments viz, stressed (rainfed) and non stressed (irrigated). The experiment in each environment was laid out in Complete Randomized Block Design with two replications. The variability study indicated higher phenotypic and genotypic coefficient of variation accompanied by high heritability and genetic advance over mean. The study revealed wide range of variability and high heritability for all the traits. The genetic advance as per cent mean suggesting still there is scope for further improvement of genotypes for these characters. Correlation studies indicated that grain yield had significant negative correlation at phenotypic and genotypic level with days to 50 per cent flowering and days to maturity, where as it showed positive significant correlation with harvest index under rainfed condition at both levels. While under irrigated condition days to 50 per cent flowering, 1000 grain weight and days to maturity showed significant positive correlation with grain yield at both genotypic and phenotypic levels. Plant height showed significant negative association with grain yield, while grains per spike and 1000 grain weight had significant positive effect on grain yield only at genotypic level. Path analysis revealed that under irrigated condition highest positive direct effect was exhibited at both genotypic and phenotypic levels by harvest index, days to maturity and number of spikelets per spike. While under rainfed condition days to 50 per cent flowering, root length and field emergence have exhibited highest positive direct effect at both genotypic and phenotypic levels

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