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Agriculture University, Jodhpur

Agriculture University, Jodhpur was established on 14th September, 2013 by Government of Rajasthan under Agriculture University, Jodhpur Act 21 of 2013 to focus on holistic development of arid and semi-arid regions of the state covering 6 districts (Jodhpur, Barmer, Nagaur, Pali, Jalore and Sirohi), constituting 28% of total geographical area which is sustaining 20.8% human and 28.4% animal population of the state. The districts under jurisdiction of the university cover 3 agro-ecological zones of the state. These are Arid Western Plain Zone Ia (Jodhpur and Barmer districts), Transitional plain of Luni Basin Zone IIb (Jalore, Pali, and Sirohi districts) and part of Transitional Plain of Inland Drainage Zone IIa (Nagaur district). The university has 1 institute of diploma and 3 colleges to produce highly competent educated human resources in agriculture and allied sciences besides 2 agricultural research stations, one each in zone Ia & IIb and 3 agricultural research sub stations, one in each zone to prepare, plan and perform highly need based research in this acute water scarce but naturally rich bio-diversified zone of the country. The third most important part in tri-pillar (Teaching, Research & Extension) of agricultural development, the extension for transfer of technologies are reached to doorsteps of the farming community by 6 Krishi Vigyan Kendras (K-V-Ks), 2 in Nagaur district and 1 each in Jodhpur, Barmer, Jalore & Sirohi districts under the umbrella of the university. The different units of teaching, research and extension are coordinating to systematically run by the headquarter situated at Mandor, Jodhpur.

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20231
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Subject: Genetics and Plant Breeding × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Heterosis, Combining ability and Stability study in Castor (Ricinus communis L.)
    (Agriculture University, Jodhpur, 2023-09-25) Sharma, Versha; Kumhar, Sita Ram
    The present experiment “Heterosis, Combining ability and Stability study in Castor (Ricinus communis L.)” was conducted in randomized block design (RBD) with three replications under three different environmental conditions viz., Kharif, 2020 at Agricultural Research Station, Mandor, Jodhpur (E1); Kharif, 2021 at Agricultural Research Station, Mandor, Jodhpur (E2) and Instructional Farm, College of Agriculture, Jodhpur (E3). Experimental material was consisted of 44 entries comprising of 30 crosses, developed from three lines (MCP-1-1, SKP-84 and DPC-15) and ten testers (MP-2-17, MP-12-17, MP-27-17, MP-32-17, MP-34-17, MP-35- 17, MP-36-17, MP-39-17, MP-41-17 and MP-42-17) using line × tester along with one check, GCH-8. The crop in E1 was sown on 1st week of August (Kharif, 2020), E2 on 4th week of August and E3 on 2nd week of September (Kharif, 2021). The observations were recorded for 12 characters viz., days to emergence of primary raceme, days to maturity of primary raceme, height up to primary raceme (cm), number of nodes to primary raceme, number of effective raceme per plant, effective primary raceme length (cm), number of capsules per primary raceme, 100-seed weight, volume weight (g/100 ml), seed yield at 120, 150, 180 and 210 days after sowing (g/plant), oil content (%) and ricinoleic acid content (%). Analysis of pooled data for experimental design indicated that genotypes exhibited significant differences for all the traits in individual as well as in pooled analysis. Environmental influence was observed on all the traits studied as the significant differences were observed for all the characters except days to maturity of primary raceme. Genotype × environment exhibited significant differences for all the traits except days to maturity of primary raceme and 100-seed weight. Pooled analysis of variance due to lines and testers was also significant for all the traits except seed yield at 210 days after sowing in lines. Parents and hybrids were also significant for most of the traits under individual as well as pooled over environments. Mean squares due to lines vs. testers indicated predominance of variation for most of the traits except 100-seed weight, seed yield at 120 and 210 days after sowing; and ricinoleic acid content. The magnitude of 2gca was greater than 2sca for days to emergence of primary raceme, days to maturity of primary raceme, height up to primary raceme, number of nodes to primary raceme, effective primary raceme length and 100-seed weight over environments; whereas  2 sca was higher than that of  2 gca for seed volume weight. For traits viz., number of effective raceme per plant, number of capsules per primary raceme, seed yield at 120, 150, 180 and 210 days after sowing both additive and dominance gene action found to be involved. Oil content and ricinoleic acid content showed negative ratio of variance due to gca to variance due to sca (-2gca/-2sca) which indicated that the environmental influence were higher for these two traits. GCA effects indicated that among lines, MCP-1-1 found good general combiner for seed yield at 120, 150, 180 and 210 days after sowing and; for other yield contributing traits. Parent DPC-15 considered as good general combiner for earliness, on the contrary, two testers viz., MP-12-17 and MP-27-17 were found superior for overall seed yield at final harvest (at 210 days after sowing) and also for some yield governing traits. For both high oil content and ricinoleic acid content MP36-17 considered as desirable. Hybrids, SKP-84 × MP-36-17, MCP-1-1 × MP-12-17 and DPC-15 × MP-34-17 for overall seed yield and MCP-1-1 × MP-2-17, SKP-84 × MP-34-17 and DPC-15 × MP-12-17 for earliness were the best specific combiners. On the basis of heterosis, the best hybrids for seed yield were MCP-1-1 × MP-12-17, MCP-1-1 × MP-42-17 which were also good performer for oil content. For earliness, DPC-15 × MP-12-17 and DPC-15 × MP-2-17; and for oil content and ricinoleic acid content MCP-1-1 × MP-35-17 and MCP-1-1 × MP-36-17 considered as better hybrids. On the basis of stability analysis most of the traits showed stable performance as the genotype × environment interaction was significant only for three characters viz., number of capsules per primary raceme, seed yield at 120 days after sowing and ricinoleic acid content. Among lines, MCP-1-1 found stable for overall seed yield at final harvest. Tester, MP-34-17 was average stabile for five traits viz., seed yield at 180 days after sowing, days to emergence of primary raceme, height up to primary raceme, oil content and ricinoleic acid content whereas MP-12-17 was having average stablility for four characters viz., number of nodes to primary raceme, number of effective raceme per plant, 100-seed weight and oil content. Hybrids, MCP-1-1 × MP-35-17, MCP-1-1 × MP-27-17 and MCP-1-1 × MP-39-17 were considered to be the best as these hybrids showed average stability for overall seed yield and maximum number of traits over others. For oil content and ricinoleic acid content two hybrids found average stable viz., MCP-1-1 × MP-12-17 and DPC-15 × MP-32-17. On overall basis, female parent (line) MCP-1-1 and male parent MP-12-17 (tester) was identified as good performer on the basis of significant gca effects and stability analysis for seed yield. Hybrid MCP-1-1 × MP-12-17 had high sca effects, maximum heterosis as well as average stability for seed yield, therefore, considered as the best among all the hybrids.