Genetics of yield and yellow vein mosaic virus (YVMV) resistance in okra [Abelmoschus esculentus (L.) Moench]
| dc.contributor.advisor | R K Yadav | |
| dc.contributor.author | Khade Yogesh Popat | |
| dc.date.accessioned | 2020-02-22T09:34:52Z | |
| dc.date.available | 2020-02-22T09:34:52Z | |
| dc.date.issued | 2019 | |
| dc.description | T-10157 | en_US |
| dc.description.abstract | Okra is an important vegetable crop of India ranking first across the world in terms of area and production. However, average productivity of okra has remained very low and almost stagnant over the last few decades. Moreover, prevalence of serious yellow vein mosaic virus (YVMV) disease has affected fruit yield and quality drastically. The present investigation was undertaken to understand the genetics of yield and yield related traits; and YVMV resistance through generation mean analysis (GMA). ANOVA revealed the presence of significant variation among generations for all the yield and related traits across the eight crosses. The scaling and joint scaling test indicated that inadequacy of additive–dominance model to explain the gene effects. Six parameter model explained complex pattern of inheritance for yield and related traits. Gene effects viz., additive (d), dominance (h) and epistatic effects (i, j, l) found to be significant across the eight crosses. While, the magnitude of dominance effect (main effect) and dominance × dominance (interaction effect) was larger than additive gene effects for traits such as yield per plant, first fruiting node, days to 50% flowering, inter-nodal length, plant height, fruit diameter, fruit length, number of fruits per plant and average fruit weight, thereby indicating importance of population improvement approaches particularly reciprocal recurrent selection. Duplicate type of epistasis revealed for yield and related traits suggesting that positive alleles of traits dispersed in the parents that nullifying the influence. GMA for 15 biochemical traits led to identification of major proportion of non-additive gene effects over additive and epistatic gene effects. Out of 14 okra genotypes screened against YVMV resistance revealed highly resistant (DOV-12 and DOV-66), two moderately resistant (DOV-62 and DOV-64) and ten susceptible genotypes. Chi-square analysis in F2 and back cross populations (BC1P1 and BC1P2) suggested involvement of single dominant gene that followed typical Mendellian monogenic ratio of 3:1 in resistant × susceptible cross. In resistant × resistant cross, presence of duplicate dominant epistasis (15:1 ratio) for resistance was evident through chi-square analysis. Non-allelic relationship existed among the different dominant genes contributed by different resistant sources. Analysis of interspecific crosses has proved that Abelmoschus caillei was better and more compatible with Abelmoschus esculentus (cultivar: Pusa A-4) compared to Abelmoschus tetraphyllus and Abelmoschus moschatus considering characters such as fruit setting, average number of seeds per fruit and germination of F1 seeds. Key words: | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810143452 | |
| dc.keywords | Okra; generation mean analysis; fruit yield; yellow vein mosaic virus; interspecific hybrids | en_US |
| dc.language.iso | en_US | en_US |
| dc.publisher | DIVISION OF VEGETABLE SCIENCE ICAR-INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHI | en_US |
| dc.sub | Vegetable Science | en_US |
| dc.subject | null | en_US |
| dc.theme | Genetics of yield and yellow vein mosaic virus (YVMV) resistance in okra [Abelmoschus esculentus (L.) Moench] | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | Genetics of yield and yellow vein mosaic virus (YVMV) resistance in okra [Abelmoschus esculentus (L.) Moench] | en_US |
| dc.type | Thesis | en_US |