Panwar, I.S.Gangopadhyay, Shipra2018-09-182018-09-182018http://krishikosh.egranth.ac.in/handle/1/5810073550In the present study entitled ―Genetic analysis of segregating generations for yellow rust resistance in bread wheat (Triticum aestivum L. em. Thell)‖, the cross WH1105 x WH711 derived F2, F3, BC1F2 and BC1F3 generations were evaluated for inheritance studies and molecular aspects of yellow rust resistance and genetics of quantitative traits including grain yield and its component traits. The experiments were conducted at the research area of Department of Genetics and Plant Breeding, CCS Haryana Agricultural University (CCSHAU), Hisar, India during two successive years of Rabi seasons 2014-15 and 2015-16. The field results have shown that inheritance of yellow rust was governed by two dominant genes. Generation mean analysis revealed significant differences for all traits studied. The C-scale was significant for all of characters indicating the presence of non-allelic interactions. Preponderance of additive component was recorded for all the characters, except spike weight (g) over the dominance component. Additive x additive (i) and dominant x dominant (l) type of interactions were reported significant for most of the characters. Duplicate type of interaction was recorded for number of tillers per plant, grain yield per plant (g) and biological yield per plant (g). Grain yield per plant (g) showed significant positive correlations with number of tillers per plant, spike length (cm), spike weight (g), number of grains per spike, number of spikelets per spike, 1000 grain weight (g), biological yield per plant (g) and harvest index (%). Path analysis revealed that the biological yield per plant (g) had highest positive direct effect on grain yield per plant (g) followed by harvest index (%) and number of tillers per plant. Out of the 210 primers, 70 primers (including eight Yr specific primers) were found polymorphic and 140 primers were monomorphic. The size of PCR amplified products ranged from 119 bp (Xgwm133) to 290 bp (Xgwm359). The molecular size difference between the smallest and the largest allele at a SSR locus varied from 7 bp (Xgwm11) to 35 bp (Xbarc1152). It was confirmed by NTSYS-PC UPGMA cluster tree and dendrogram that two parents (WH1105 and WH711) were most genetically diverse and the progeny lines were interspersed between the two parents for yellow rust.ennullThesis