Study of Combining Ability And Heterosis in Niger ( Guizotia Abyssinica Cass.)
| dc.contributor.advisor | Sohan Ram | |
| dc.contributor.author | Ekbalaque Ahmad | |
| dc.date.accessioned | 2024-07-13T06:26:40Z | |
| dc.date.available | 2024-07-13T06:26:40Z | |
| dc.date.issued | 2001 | |
| dc.description.abstract | The present investigation was undertaken to evaluate nine diverse germplasm lines with the objectives of genetically enhancement of Niger breeding lines in respect of seed yield and important yield contribution characters. Nine line were crossed in daillel fashion .Parents and their 36 F1s were grown in randomized block design with three replication during Kharif 1999. The data was recorded on ten competitive plants for each character which were analyzed for variability heritability genetic advance correlation heterosis and combining ability analysis. The analysis of variance revealed highly significant differences among the parent’s parents Vs crosses for most of the characters studied while crossed showed highly significant differences for all characters. Variability study also revealed a wide range of variation for most of the characters. The increased value of cross over parental mean for all characters, except days to 50 percent flowering, days to maturity and plant height. The phenotypic and genotypic variance were more in the crosses than in the parents for most of the characters except days to 50 percent flowering and days to maturity. The phenotypic and genotypic coefficient of variations were greater in crosses than parents except days to maturity and capitulum diameter. The heritability estimates in broad sense were high for most of the characters studied in conjunction with medium genetic advance. In correlation study , the seed yield was found to be positive and significantly correlated with number of primary and secondary branches per plant, capitulum per plant, capitulum diameter and 1000-seed weight. Extent of heterosis varied considerably for different characters. The extent heterotic crosses for different characters were mostly different over mid, better and best-parents. The heterosis over better and best-parents ranged from -35.75 to 35.50 percents for seed yield respectively. The crosses BAUM-1 X BNM1 BNUM1, BNM2, Phule-4 XBNH-1 and GA-10 X BAUM-1 were best cross combination for heterosis over mid, better and best parents while many other crosses were also found to be highly positive significant for heterosis for other yield contributing characters. Mean square due to general and specific combinating ability were highly significant for all characters indicating thereby the involvement of both additive and non additive gene action in expression of these characters. The relative magnitude of o2 sca was higher than that of o2gca for all characters indicaiting preponderance for non – addition genetic variance . The estimates of mean degree of dominance revealed over dominance effect for many yield attributes. Among the parental lines, phule-4, BAUM-1 and GA-10 were adjudged as the best general combiners for seed yield which were highly significant while the parents BAUM-1 CNH_1etc. were found to be best general combiners for most of the plant characters. The best specific cross combination for seed yield were BAUM-1X BNM-1 X BNH2, Phule 4, X BNH1, GA 10X BNM2, BNC 120 X Ootacamund and chh1 X GA-10 had highly positive significant sca effects. | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810211912 | |
| dc.language.iso | English | |
| dc.pages | 76 | |
| dc.publisher | Birsa Agricultural University, Ranchi | |
| dc.sub | Genetics and Plant Breeding | |
| dc.theme | Study of Combining Ability And Heterosis in Niger ( Guizotia Abyssinica Cass.) | |
| dc.these.type | M.Sc | |
| dc.title | Study of Combining Ability And Heterosis in Niger ( Guizotia Abyssinica Cass.) | |
| dc.type | Thesis |