Browsing by Author "Pathania, Rahul"
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ThesisItem Open Access STUDIES ON GENETIC DIVERGENCE FOR POD YIELD AND ITS CONTRIBUTING TRAITS IN OKRA [Abelmoschus esculentus L. (Moench)](College of Horticulture and Forestry Neri, Hamirpur (H.P.), 2021-11-15) Pathania, Rahul; Kumar, DharminderThe present investigation entitled “Studies on genetic divergence for pod yield and its contributing traits in okra (Abelmoschus esculentus (L.) Moench).” was carried out on 75 genotypes of okra including one check (Pusa Bhindi-5) at vegetable farm located at Regional Horticultural Research and Training Station, Dr. YS Parmar University of Horticulture and Forestry, Jachh (Nurpur), District-Kangra (H.P.) during Summer season, 2020. To determine the level of variability, heritability, correlation, and path coefficient analysis for yield and other horticultural traits as well as the assessment of genetic divergence among genotypes, they were all analyzed in a RCBD. For all of the analyzed traits, analysis of variance revealed considerable variation among genotypes. Genotypes EC 305689, EC 305685, EC 305687, EC 305613 and LC-59-2 were considered superior in terms of overall performance for fruit yield per plant and other important traits. They may be potential parents for direct growing after multi-location evaluation or for use in future breeding programmes. The PCV and GCV for fruit weight, days to 50 per cent flowering, internodal length, and fruit production per plant were found higher. Heritability coupled with genetic gain was examined higher for days to 50 per cent flowering, first fruiting node, internodal length, fruit weight, number of seed/fruit, plant height and fruit yield/plant. A positive and significant correlation of fruit yield/plant was found with fruit weight, first fruiting node, number of ridges/fruit, number of fruits/plant, days to 50 per cent flowering, fruit diameter, and leaf width using phenotypic and genotypic correlation coefficients. The path coefficient analysis, revealed that fruit weight had the greatest positive direct impact on fruit yield/plant, followed by number of fruits/plant, first fruiting node, days to 50 per cent flowering, 100 seed weight, and leaf width. During genetic divergence analysis, 75 genotypes were grouped in five clusters and cluster I had the greatest intra-cluster distance, whereas Cluster II had the smallest. Clusters I and V had the maximum inter-cluster distance, such genotypes could be hybridised and used to develop superior hybrids/recombinants.ThesisItem Open Access STUDIES ON WILT OF CHICKPEA CAUSED BY Fusarium oxysporum f.sp. ciceris(CSKHPKV, Palampur, 2018-07-24) Pathania, Rahul; Thakur, B.R.Wilt of chickpea (Cicer arietinum L), caused by Fusarium oxysporum f.sp. ciceris, was reported from India by E. J. Butler in 1918. The pathogen Fusarium oxysporum f.sp. ciceris has been reported highly variable and very difficult to manage. In the present investigations, 15 isolates of F. oxysporum f.sp. ciceris were obtained from isolations made from diseased samples collected from different chickpea growing areas in the state and adjoining ones. Pathogen variability of 15 isolates of F. oxysporum f.sp. ciceris were ascertained on the basis of morpho-cultural, pathogenic and molecular characterization. The 15 isolates of F. oxysporum f.sp. ciceris were grouped into 6 different variants on the basis of morpho-cultural and pathogenic characteristics whereas, four groups of variants were characterized among 12 isolates F. oxysporum f.sp. ciceris through genetic studies, since the DNA of three isolates were not extracted. For disease management, different components viz., organic enriched composts and formulations, botanicals, bioagents, fungicides and germplasm were evaluated in vitro to frame the management strategies for the disease. In organic enriched composts, the extracts of CPP at 25.0 per cent concentration yielded maximum mycelial inhibition of 52.2 per cent followed by NADEP with 50.3 per cent. In organic formulations, extract of Cow urine at 10 per cent concentration yielded maximum mycelial inhibition of 72.9 per cent. In botanicals, the aqueous extracts of Melia azedarach at 25 per cent test concentration showed maximum mycelial inhibition up to 59.6 per cent whereas, the alcoholic extracts of Eupatorium adenophorum showed maximum mycelial inhibition of 91.80 per cent at 25 per cent test concentration. In bioagents, JMA-4 strain of Trichoderma harzianum showed mycelial inhibition of 67.4 per cent against F. oxysporum f.sp. ciceris. All the test fungicides were found effective even at 50 ppm with greater than 50.0 per cent mycelial inhibition against F. oxysporum f.sp. ciceris. Bavistin (Carbendazim) 50WP and Thiram (hexathir) 75 DS yielded cent per cent mycelial inhibition even at 500 ppm followed by Vitavax power (carboxin 37.5% + thiram 37.5%) 75WP and Tilt (propiconazole) 25 EC with 99.7 and 93.7 per cent respectively. Out of 102 chickpea lines, eight viz., IC298993, IC552118, IC552176, IC486961, CMI-34, CMI-52, ST-28 and ST-24 were resistant against wilt of chickpea caused by Fusarium oxysporum f.sp. ciceris.