HETEROSIS AND COMBINING ABILITY ANALYSIS USING PETALOID CYTOPLASMIC MALE STERILITY IN TROPICAL CARROT (Daucus carota L.)
| dc.contributor.advisor | A. K. Sureja | |
| dc.contributor.author | JANANI R | |
| dc.date.accessioned | 2020-05-21T07:08:05Z | |
| dc.date.available | 2020-05-21T07:08:05Z | |
| dc.date.issued | 2019 | |
| dc.description | T-10223 | en_US |
| dc.description.abstract | Daucus carota L. is an important vegetable crop, grown commercially for its edible fleshy roots all around the world. Combining ability analysis and heterosis breeding strategies are vital for any varietal development programme. The present study “Heterosis and combining ability analysis using petaloid cytoplasmic male sterility in tropical carrot (Daucus carota L.)” had been undertaken with the major objective to study heterosis and combining ability for eleven quantitative and nine biochemical & quality traits and five mineral nutrients. The material of the study consists of 19 genotypes (4 CMS lines and 15 testers), 60 hybrids and one standard check, Pusa Vasuda. The analysis of variance revealed highly significant difference for all the quantitative, biochemical & quality traits and mineral nutrients. The most promising inbreds for root yield are DCat-122, DCat-39 and DCat-54. The lines and testers that recorded highest GCA for root weight per plant and root yield was DCatCMS-7 and DCat-92, respectively. Highest significant root yield was obtained in the hybrids DCatH 5392, followed by DCatH 700 and DCatH 9892 with heterosis percentage of 14.29, 13.1 over better parent and 33.33, 31.93 over standard check (Pusa Vasuda), respectively. The value of heterosis percentage for the hybrid DCatH 5392 was 14.19%, 14.29% and 33.33 % over mid parent, better parent and standard check (Pusa Vasuda), respectively. Both GCA and SCA effects were highly significant for all the traits studied. The lines and testers with highly significant GCA were DCatCMS-7 and DCat-92. The variance due to SCA was greater than GCA for all the quantitative traits except for root maturity, root length and core diameter. For biochemical and quality traits, the highest yielding hybrids for TSS, fructose, juice recovery, total sugar were DCatH 792, DCatH 792, DCatH 9854 and DCatH 9192, respectively. Similarly, for the quality traits like total carotenoids, lycopene, β-carotene, lutein and total antioxidant activity, the highest performance was found in the hybrids DCatH 5396, DCatH 9834, DCatH 5322, DCatH 5326 and DCatH 7126, respectively. In case of quality traits like total carotenoids, β-carotene and antioxidant activity, nonadditive gene action plays a major role while additive gene action plays a major role for traits like lycopene, lutein, TSS, fructose and juice yield. The hybrid with highest 214 iron content was DCatH 9800, DCatH 739 for zinc content and DCatH 739 for copper content. The hybrids with high potassium and calcium contents were DCatH 9139 and DCatH 533, respectively. The non-additive gene action was predominant in all the mineral nutrients studied. In most of the yield contributing traits and quality traits non-additive (dominance) variance played a major role. The genetic diversity analysis using SSR markers also provided that there was a sufficient diversity among the selected lines and testers and their cross combinations were expected to yield heterotic hybrids. However, correlation studies between morphological and molecular divergence did not provide significant correlation with heterosis. Thus, from the results it was evident that heterosis breeding can be effectively used for improvement of tropical carrot in the studied traits. The efficient hybrids and lines can be further used in carrot breeding programme. Keywords : Daucus carota L., Heterosis, DCatH, DCatCMS | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810146233 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | JANANI R DIVISION OF VEGETABLE SCIENCE INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHI | en_US |
| dc.sub | Horticulture | en_US |
| dc.theme | HETEROSIS AND COMBINING ABILITY ANALYSIS USING PETALOID CYTOPLASMIC MALE STERILITY IN TROPICAL CARROT (Daucus carota L.) | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | HETEROSIS AND COMBINING ABILITY ANALYSIS USING PETALOID CYTOPLASMIC MALE STERILITY IN TROPICAL CARROT (Daucus carota L.) | en_US |
| dc.type | Thesis | en_US |