COMBINING ABILITY AND GENE ACTION STUDIES IN OAT (Avena sativa L.)

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dc.contributor.advisorSood, V.K.
dc.contributor.authorRana, Amit
dc.date.accessioned2019-08-26T06:55:26Z
dc.date.available2019-08-26T06:55:26Z
dc.date.issued2019-07-17
dc.description.abstractThe present investigation entitled “Combining ability and gene action studies in oat (Avena sativa L.)” was conducted to understand the nature and magnitude of gene action along with combining ability estimates for different traits so as to identify potential parents and cross combinations for future breeding programmes. Genetic diversity analysis of the parents involved was also done using principal component analysis and molecular markers. The material for the investigation consisted of 10 diverse lines of oat, viz., EC 528865, HJ 8, KRR AK 26, PLP 14, KRR AK 15, JPO 36, Kent, UPO 130, K 353 and EC 605834 which were crossed with four testers viz., JPO 46, PLP 1, UPO 30 and HFO 52, to produce 40 F1 hybrids during rabi 2017-18. These F1s along with their parents were raised in Randomized Block Design with three replications during rabi 2018-19 at the Experimental Farm, Fodder Section of the Department of Crop Improvement, CSK HPKV, Palampur (HP) and data were recorded for different agro-morphological, forage, seed and quality traits. Genetic diversity on the basis of cluster analysis, principal component analysis (PCA), molecular markers (SSRs) and population structure revealed significant genetic divergence among parents used in the study. Combining ability estimates showed that genetic variance due to lines were significant for all the traits except dry matter, whereas testers had significant genetic variance for all the traits except tillers per plant, dry matter, biological yield per plant, 100-seed weight and neutral detergent fibre. Line × tester interactions were found to be significant for all the traits except leaf stem ratio and dry matter. Higher magnitude of dominance variance over additive variance and low heritability estimates for most of the traits showed preponderance of non-additive gene action revealing the importance of dominance and epistatic effects in the inheritance of these traits. Per cent contribution of line × tester interactions were highest for most of the traits followed by lines. Lines viz., EC 528865, UPO 130 and HJ 8 were overall good combiner for most of the traits and potential parent sources for recombinant breeding. SCA estimates showed cross combinations viz., EC 605834 × UPO 30, PLP 14 × HFO-52 and EC 528865 × PLP 1 have highest sca values for green fodder yield, while UPO 130 × PLP 1 indicated desirable significant sca effect for ADF and NDF content. Kent × JPO 46 showed highest β-glucan content among all combinations followed by PLP 14 × UPO 30 and HJ 8 × UPO 30. UPO 130 × JPO 46 showed promising heterosis among all the cross combinations for green fodder yield and seed yield as compared to check PLP 1 and found moderately resistant to powdery mildew, while cross combinations viz., KRR AK 26 × JPO 46, KRR AK 26 × PLP 1 and KRR AK 15 × PLP 1 were found resistant to powdery mildew. On the basis of gca, sca, standard heterosis and resistance to powdery mildew, cross combinations viz., KRR AK 26 × JPO 46, Kent × JPO 46, PLP 14 × UPO 30 and KRR AK 26 × HFO 52 were found promising and can be expected to throw transgressive segregants.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810123799
dc.keywordsOaten_US
dc.language.isoenen_US
dc.pages163en_US
dc.publisherCSKHPKV, Palampuren_US
dc.subGenetics and Plant Breedingen_US
dc.subjectnullen_US
dc.themeIdentify potential parents and cross combinations utilizing estimates of combining ability in oat.en_US
dc.these.typeM.Scen_US
dc.titleCOMBINING ABILITY AND GENE ACTION STUDIES IN OAT (Avena sativa L.)en_US
dc.typeThesisen_US
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