http://localhost:8080/handle/123456789/2787 Sat, 18 Apr 2026 21:03:13 GMT 2026-04-18T21:03:13Z http://localhost:8080/handle/123456789/932 GENETIC VARIATION IN LOCAL AMAN RICE GENOTYPES (Oryza saliva L.) HOSSAIN, MD. SHAJIEDUR The experiment was conducted with 34 local rice genotypes with one check varieties at the Sher-e-Bangla Agricultural University experimental field to study characterization and genetic diversity of 35 local rice genotypes and to find out the association among the genetic characteristics. Regarding mean performance, the genotype G4 took the longest period for first flowering is (115) followed by genotype 0-35 (114) and the genotype 0-12 had the minimum days for first flowering is (99). The highest number of tilled grain per panicle was recorded in genotype 0-10 was (144.33). The highest number of effective tiller (10.33) was recorded in genotype 0-IS. The highest 1000 grain weight (26.00) was recorded in the genotype 0-15. The highest grain yield per hill was produced by genotype 0-24 (35.90g). The highest &g was fbund for number of root hair (103415.40) and the lowest magnitude of &g was observed in number of primary branches per panicle (1.97). The highest a2p was found for number of root hair (109410.31) and the lowest magnitude of &p was observed in number of primary branches per panicle (2.61). High GCV and PCV for number of effective tiller, root weight, number of root hair and grain yield per hill (g) indicated that selection of these traits would be effective. Correlation of Grain yield per hill was found to be highly significant and positive for number of root hair, days to flowering and plant height at both genotypic and phenotypic level and negatively significant for number of secondary branches per panicle at both level. Significant positive correlation of grain yield per hill with number of root hair, days to flowering and plant height implied that selection for these characters would lead to simultaneous improvement of grain yield in rice. Days to flowering had maximum direct effect (0.719) on yield followed by number of effective tiller (0.635). number of unfilled grain per panicle (0.544). Genotypes were grouped into five different clusters. PCA showed the highest inter-cluster distance was observed between the cluster I!and V (46.71) followed by Ill and V (46.40) and IV and V (45.43). Genotypes from these three clusters may be involved in hybridization as wide genetic variations exist among the groups. Cluster IV exhibited the highest intra-cluster distance (38.36), while the lowest distance was observed in cluster V (23.09). A thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN GENETICS AND PLANT BREEDING Sun, 01 Dec 2013 00:00:00 GMT http://localhost:8080/handle/123456789/932 2013-12-01T00:00:00Z http://localhost:8080/handle/123456789/931 HETEROSIS AND GENE ACTION FROM 7x7 DIALLEL ANALYSIS IN Brassica nap us L. KAMRUZZAMAN, S. M. An experiment on oleiferous Brassica napwi L. was conducted to evaluate the heterosis and gene action for ten different characters. Out 21 of F1 s, the hybridsBS-7xNAP179showed desirable negative heterosis for the characters of shorter plant height.No crosses showed desirable negative heterosis for early flowering and early maturity. There was also no crosses showed desirable positive heterosis for no. of primary branches per plant, no. of secondary branches per plant and siliqua length. The hybrids NAP94006xl3S-7. NAP-9908xNAP 179 and BS-1 3xN AP-248were found to exhibit the best heterosis for no. of siliquaeper plant. For thousand seed weight the hybrid NAP94006xNAP- 179 was best. For seed yield per plant the crosses NAP-94006xNAP- 179 was found to be the best. The parent NAP-248 was the best general combiner for early flowering and seed yield per plant, parent 135-7 for high no. of secondary branches and desirable plant height, parent BS-13for early maturity, no. of primary branches per particle and no. of seeds per siliqua while the parent NAP-I 79 was the best general combiner for 1000 seed weight. On the basis of average score and rank position, that cross NAP9908x NAP-94006 was good specific combiner for no. of secondary branches andno. of siliquae per plant. The combination NAP94006xNAP179was the best specific combiner for early flowering and seed yield per plantwhile NAP_94006xNAP-248was the best for early maturity. The hybrid NAP248x NAP-179was the best for no. of primary branches per plant. For siliqua length NAP_2037x BS-I3was the best specific combiner. The cross NAP94006xNAP248was the best for the no. of seeds per siliqua and BS-I3XNAP-179 was best for 1000-seed weight. A thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN GENETICS AND PLANT BREEDING Sun, 01 Dec 2013 00:00:00 GMT http://localhost:8080/handle/123456789/931 2013-12-01T00:00:00Z http://localhost:8080/handle/123456789/930 COMBINING ABILITY AND HETEROSIS IN SHORT DURATED BORO RICE THROUGH AUS X BORO CROSSING HASAN, MD. ABID This research work was carried out by using number of F2 population of some intervarietal crosses of the species Oryza sdiliva in the experimental farm. Sher-e-Bangla Agricultural University (SAU). Dhaka during October 2011 to April 2012 for estimating the mean performance, combining ability (General and Specific) and residual heterosis. Combining ability analysis revealed significant general and specific combining ability for most of the traits studied indicating involvement of both additive and non-additive gene action in the inheritance of yield and yield contributing characters. Significant, desirable and highest SCA effect was observed for days to maturity in cross combination BR2I x BR24 which might be selected as the best specific combiner for earliness. Highest, significant desirable SCA effects was observed for yield and most of the yield contributing characters in cross combination BR26 x BRRI Dhan29 which might be selected as best specific cross combination followcd by BRRI Dhan28 x BRRI Dhan29, BR26 x BRRI Dhan36 and BR24 x 13R26 for yield and yield contributing characters. These cross combinations also showed heterosis and therefore these cross combinations may be reviewed fl.u-ther for earliness and yield performance. Mean performance revealed that, BR 21 x BRRI Dhan36 required minimum days to flowering and maturity with reasonable yield followed by BR 24 x BRRI Dhan 36. So, these two cross combination could be selected for short duration and high yielding variety development. A thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN GENETICS AND PLANT BREEDING Sun, 01 Dec 2013 00:00:00 GMT http://localhost:8080/handle/123456789/930 2013-12-01T00:00:00Z http://localhost:8080/handle/123456789/929 CORRELATION, PATH ANALYSIS AND GENETIC DIVERSITY IN AMAN RICE (Oryza saliva L) SARWAR, GOLAM The experiment was conducted with forty two genotypes of rice at the experimental farm of Sher-e-Bangla Agricultural University, l)haka during the period of JulyDecember. 2013 to estimate the genetic variability, correlation, path and diversity among the genotypes. The experiment was conducted using Randomized Complete Block Design with three replications. All the genotypes varied significantly with each other for all the studied characters indicated the presence of considerably variations among the genotypes studied. The PCV values were higher than the respective CCV values for all the characters under study except unfilled grains per panicle indicating that the characters were less influenced by the environment. Total tillers per plant effective tillers per plant tilled grains per panicle, unfilled grains per panicle and yield per plant showed high heritability along with high genetic advance as percentage of mean were normally more helpful in predicting the genetic gain under selection. From the correlation and path analysis it was revealed that total tillers per plant cflèctive tillers per plant and days to maturity showed significantly positive gcnotypic correlation with yield as well as employed positive direct effect on yield suggesting that the selection for these traits would helpful for the improvement of yield per plant. As PCA, D2 and clusters analysis the genotypes were grouped into five diflèrent clusters. Clusters IV had the maximum fourteen and cluster Ill had the minimum three genotypes. The highest inter-cluster distance was observed betwecn II and Ill and the lowest was observed between IV and V. The highest and lowest intra-cluster distance was observed in Ill and IV respectively. Genotypes included in cluster V were important for total tillers per plant, eflbctive tillers per plant days to 50% flowering and thousand grains weight cluster III were important for filled grains per panicle and unfilled grains per panicle. cluster IV were for plant height and yield per plant Considering the diversity pattern and other agronomic performances, the genotypes Special from AL-29. AL-36, PP.413(i). AL-17(iii)B, AL-17(iii). AL-17(ii)A. Special from-129, Special from 17(iv), AL44(i), AL-li, Special from AL-36(D). PP48. IR25B, Special from AL-33. 114-2513 (Tall), P-58 (ii) might be considered better parents for the future efficient hybridization programme. A thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN GENETICS AND PLANT BREEDING Sun, 01 Dec 2013 00:00:00 GMT http://localhost:8080/handle/123456789/929 2013-12-01T00:00:00Z