Genetic studies for yield and its contributing traits in okra [Abelmoschus esculentus (L.) Moench]
| dc.contributor.advisor | Singh, Dhirendra Kumar | |
| dc.contributor.author | Singh, Neeraj | |
| dc.date.accessioned | 2019-02-09T07:19:12Z | |
| dc.date.available | 2019-02-09T07:19:12Z | |
| dc.date.issued | 2018-01 | |
| dc.description.abstract | The present investigation was carried out during rainy season (2015) and warm season (2016 and 2017) at Vegetable Research Center of Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, with the objectives to assess genetic variability, inter-character association and their direct and indirect effects, heterosis, combining ability and gene action for different quantitative traits. Genetic variability, inter-character association and path coefficient analysis were studied in 185 okra genotypes. The analysis of variance revealed significant genetic differences were present among okra genotypes for the fifteen characters under study. A moderate to wide range of mean values among the genotypes for different characters were observed. Moderate to high genotypic coefficient of variation together with moderate to high heritability and genetic advance as per cent of mean was reported for majority of the characters under study except average fruit weight which indicated predominant additive gene action thus these traits has an ample scope for the improvement of concerned traits through selection. The association analysis showed, highly significant and positive correlation of fruit yield per plant with number of fruits per plant followed by plant height, average fruit weight, number of seeds per fruit, fruit length, days to 50 per cent flowering, first fruit producing node, stem diameter and first flower producing node respectively, indicating the possibility of simultaneous selection among these traits. Path coefficient analysis revealed that fruit width followed by number of fruits per plant, first fruit producing node and average fruit weight had had maximum direct and indirect contribution on fruit yield per plant. Two genotypes viz., EC169430 and EC169435 were showed highly resistance reaction against yellow vein mosaic virus. Further, based on evaluation for yellow vein mosaic virus resistance, yield and earliness, fifteen genetically diverse genotypes were selected for estimation of heterosis and combining ability. From these fifteen genetically diverse parents, thirty six crosses were evolved in a line × tester mating design with twelve genotypes as female parents (lines) and three genotypes as male parents (testers). Based on extent of heterosis, EC169400 × Arka Anamika and IC117351 × Arka Anamika was identified as most promising cross combinations in among 36 crosses for many traits viz., fruit yield per plant, number of fruits per plant, plant height and inter-nodal length. The per se performance of these crosses was also superior over other crosses studied hence these crosses could be utilized as commercial hybrids. EC169400 was identified as consistent best general combiner for four traits viz., fruit length, plant height, number of fruits per plant and fruit yield per plant. For earliness character (days to 50 per cent flowering) IC093655, IC117123 and EC169430 were identified as consistent good general combiner during both the year. Ranking of desirable parents based on per se performance, gca and sca effects for 14 characters revealed that it was difficult to pick up a single good combiner for all the characters. Over the both years consistently, cross combinations viz., IC117245 × VRO 6 for fruit yield per plant, IC117245 × VRO 6, IC117351 × Arka Anamika and EC16400 × Arka Anamika for number of fruits per plant, EC169430 × Parbhani Kranti and EC169408 × Arka Anamika for plant height, EC169435 × Parbhani Kranti for 100 seed weight, IC093655 × Arka Anamika for number of seeds per fruit, EC169430 × Parbhani Kranti for primary branches per plant, IC093655 × Parbhani Kranti for intermodal length, EC169435 × Arka Anamika for fruit length showed specific combining ability effects of higher order. The estimates of _2 gca / _2 sca indicated predominance of non-additive gene action for most of the characters during both the years. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810094283 | |
| dc.keywords | genetic studies, yield components, okras | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 244 | en_US |
| dc.publisher | G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand) | en_US |
| dc.research.problem | Okras | en_US |
| dc.sub | Horticulture | en_US |
| dc.subject | null | en_US |
| dc.theme | Genetic Improvement | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | Genetic studies for yield and its contributing traits in okra [Abelmoschus esculentus (L.) Moench] | en_US |
| dc.type | Thesis | en_US |