Inheritance of grain yield, its components and resistance to cereal cyst nematode in wheat (Triticum aestivum L.)

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dc.contributor.advisorDhanda, S.S.
dc.contributor.authorYadav, Niketa
dc.date.accessioned2017-01-25T08:43:23Z
dc.date.available2017-01-25T08:43:23Z
dc.date.issued2016
dc.description.abstractThe present investigation was conducted to estimate additive, dominance and epistatic parameters, to develop the selection strategy for various traits and to determine resistance to cereal cyst nematode in bread wheat. The study was carried out during the period of rabi 2013-14 and rabi 2014-15 on six generations (P1, P2, F1, F2, B1 and B2) of two cross combinations (P 12210/Raj MR 1 and P 12231/Raj MR 1) in the Haryana Agricultural University, Hisar. The experiment was laid out in compact family block design with three replications. Observation were recorded on grain yield per plant, number of tillers per plant, 1000-grain weight, number of grains per spike, spike length, number of spikelets per spike, plant height, biomass per plant, harvest index, number of days to heading, and number of days to maturity. The results indicated that grain yield per plant, tillers per plant, plant height, biomass per plant, harvest index, days to heading and days to maturity had, in general, high PCV, GCV, heritability in broad sense and genetic advance over the crosses and years. Higher mean performance of F1 and F2 generations than their respective better parents showed overdominance for grain yield per plant, tillers per plant, 1000-grain weight, spikelets per spike, biomass per plant, harvest index, days to heading and days to maturity. Gene effects indicated that 1000-grain weight, grains per spike, spike length, plant height, days to heading and days to maturity were predominantly governed by additive gene effects, while grain yield per plant, tiller per plant, spikelet per spike, biomass per plant and harvest index were predominantly governed by dominance gene effects. Components of genetic variances indicated that for grain yield per plant, harvest index, days to heading and days to maturity additive component of genetic variance was important, while dominance component of genetic variance was, in general, responsible inheritance of 1000-grain weight, grains per spike, spike length and biomass per plant. Both additive and dominance component of genetic variances had major role in inheritance for tillers per plant, spikelets per spike, plant height and harvest index over the crosses and years. This indicated preponderance of dominance genetic component for inheritance for majority of traits and selfing for a few generations will be required for improvement of these traits through selection. Results of inheritance of nematode resistance indicated that resistance to cereal cyst nematode was governed by a single recessive gene.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/97478
dc.language.isoenen_US
dc.publisherCCSHAUen_US
dc.subGenetics and Plant Breedingen_US
dc.these.typePh.D
dc.titleInheritance of grain yield, its components and resistance to cereal cyst nematode in wheat (Triticum aestivum L.)en_US
dc.typeThesisen_US
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