Rana, VijayVerma, Praveen Kumar2022-02-212022-02-212021-02-21https://krishikosh.egranth.ac.in/handle/1/5810182670The present study entitled, “Genetic diversity in exotic and indigenous germplasm of barley (Hordeum vulgare L.)” was undertaken during Rabi 2019-20 to assess genetic diversity among 216 genotypes of barley including 144 exotic lines from ICARDA, Morocco and 66 indigenous lines along with six checks and identify potential lines for important agro-morphological traits in Augmented Block Design.Data were recorded for different traits viz., days to 50% flowering, peduncle length, spike length, plant height, number of effective tillers per plant, days to 75% maturity, number of grains per spike, biological yield per plant (g), grain yield per plant (g), harvest index and 1000-grain weight (g). Experimental lines were also screened for yellow rust (Puccinia striiformis f.sp. hordei) under field conditions. Analysis of variance revealed existence of significant genetic variation for almost all the traits under study. On the basis of mean performance, genotypes viz., HIPYT-505 and HIPYT-313 were found promising for number of effective tillers per plant, biological yield per plant and grain yield per plant. High values of PCV and GCV were observed for grain yield per plant, number of effective tillers per plant, biological yield per plant and number of grains per spike. High heritability coupled with high genetic advance was observed for number of grains per spike, biological yield per plant and grain yield per plant. Based on correlation and path analysis (direct and indirect contributions) traits viz., biological yield and harvest index emerged as important selection criteria for selecting high yielding genotypes. On the basis of inter cluster distance, four genotypes of cluster V i.e., RWA-18-26, RWA-18- 23, RWA-18-25, HIPYT-405 and one genotype of cluster XIII i.e. HBL 804 showed maximum diversity among the germplasm which is further indicative of higher chance of getting transgressive segregants by hybridization among these genotypes. 79 genotypes were further selected from clusters which have higher mean than the general mean and cluster mean for the grain yield and its component characters. The genotypes viz.,HIPYT – 609, HIPYT – 505, HIPYT – 313, ABYT 18-29, Almora28, Lachi Kandi, Gushaini and Murthan were found most promising for biological yield per plant, grain yield per plant, number of effective tillers and number of grains per spike. Screening of barley genotypes for yellow rust under field conditions showed that almost all the genotypes had varying degree of yellow rust incidence. The genotypes found resistant were BDYT 18 – 111, BDYT 18 – 72, MB 18 -17, MB 18 -50, MB 18 -145, EMB 18 -3, GGT 18-23, GGT 18-54, GGT 18-13,HIPYT-340, HIPYT-235, HIPYT-234, HIPYT-325, HIPYT-335, HIPYT-505, HIPYT251, HIPYT-79, ABYT 18-48, LIPYT-175, RWA 18-11, RWA 18-12, Almora5, Almora9, Almora21, Almora23, Almora26, Almora27, Almora30, Almora33, Almora41, Naggar and Gihu L&S. Overall, on the basis of mean performance and genetic diversity studies, genotypes namely, HIPYT-505 and Gihu L&S were found superior for different agro-morphological, yield attributing traits and also resistant to yellow rust under natural epiphytotic conditions. Hence, these genotypes can be further tested over years and locations in replicated trialsEnglishThesis