http://localhost:8080/handle/123456789/2829 Sat, 18 Apr 2026 16:08:51 GMT 2026-04-18T16:08:51Z http://localhost:8080/handle/123456789/3234 GENETIC VARIABILITY AND CHARACTER ASSOCIATION OF YIELD AND YIELD CONTRIBUTING CHARACTERS IN MAIZE (Zea mays L.) JAHAN, LABIBA Thirty maize genotypes were studied in RCBD with three replication for the variability and character association of yield and yield related traits at Sher-eBangla Agricultural University, Dhaka during January to May, 2019. Significant variations were observed among the genotypes for all the traits studied. Among the genetic parameters, high GCV values were observed for kernels per cob 6 2 analysis and cluster III consist of highest eight genotypes. The maximum inter-cluster divergence was observed between cluster I and V 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 Mon, 01 Jan 2018 00:00:00 GMT http://localhost:8080/handle/123456789/3234 2018-01-01T00:00:00Z http://localhost:8080/handle/123456789/3233 HETEROSIS AND COMBINING ABILITY IN 7×7 DIALLEL POPULATIONS OF WHITE MAIZE (Zea mays L.) AHMED, IMRAN The study was conducted to evaluate the forty-two F 1 lines derived from 7×7 full diallel cross of white maize for yield and yield components. Seven(7) inbred lines of white maizewere mated using complete 7×7 diallel fashion during rabi season 2017-18 and then evaluated their combining ability and heterosis of forty-two hybrids over two checkvarieties BARI hybrid maize-12 and BARI hybrid maize-13 at research farm of Sher-eBangla Agricultural University, Dhaka-1207 during rabi season 2018-19. The variancesfor general combining ability (GCA) were found significant for all the characters except ear diameter, while specific combining ability (SCA) was significant for all the characters except ear height and plant height suggesting that non-additive gene action was importantfor inheritance of yield and yield related characters in the hybrid progeny. GCA varianceswere much higher in magnitude than SCA for all the characters except number of row per ear and ear diameter indicating the superiority of additive gene effects for the inheritanceof these traits. The analysis of GCA revealed that parents P7 and P4 were the best general combiner for yield related character, while parents P7 and P3 for earliness and dwarf plant ype. The analysis of SCA showed that crosses P7×P1, P1×P3, P7×P4, P6×P3, P3×P5, P4×P6, P6×P7, P5×P7, P3×P7 and P4×P5 exhibited maximum positive SCA effects for yield related character viz. ear length, ear diameter, number of row per ear, number kernel per row and hundred kernel weight and kernel yield per plant. The heterosis showed that percent heterosis for grain yield varied from -9.412% to 40.421% and -16.304 to 38.361%, considering BARI hybrid maize-12 and BARI maize hybrid-13 as check varieties respectively. Twenty crosses exhibited significant and positive heterosis over the check varieties. The highest positive heterosis showed by cross P5×P7 (40.421% and 38.361%), P3×P7 (39.50% and 37.45%), P1×P3 (37.99% and 35.97%), P5×P4 (37.81% and 35.79%), P4×P7 (36.26% and 34.26%), P6×P7 (33.10 and 31.15%), P6×P4 (32.28 and 30.34%),P1×P7 (32.19% and 30.25%) ,P4×P6 (26.39% and 24.54%) and P4×P5 (21.86 and 20.07%)over the checks BARI hybrid maize 12 and BARI hybrid maize 13, respectively. Considering the performance of SCA effects and heterosis, the crosses P5×P7, P3×P7, Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in partial fulfilment of the requirements for the degree of MASTER OF SCIENCE IN GENETICS AND PLANT BREEDING Mon, 01 Jan 2018 00:00:00 GMT http://localhost:8080/handle/123456789/3233 2018-01-01T00:00:00Z http://localhost:8080/handle/123456789/3232 GENETIC EVALUATION OF BORO RICE (Oryza sativa L.) UNDER IRRIGATED AND RAINFED CONDITION JOMADDER, MD. NAYEEM Drought is a major abiotic constraint for growing rain-fed rice in Bangladesh. A set of twenty rice genotypes including local boro rice genotypes viz., Poshusail, Gorchihail, Birion, Soilerpuna, Pankaich, Gopal Deshi, Borail were evaluated under irrigated and rainfed condition at farm of the Sher-e- Bangla Agricultural University, Dhaka-1207 during December 2018 – May 2019. Ten morphological characters viz, plant height (cm), flag leaf length (cm), flag leaf width (cm), number of primary branches per panicle, number of secondary branches per panicle, panicle length (cm), number of filled grain per panicle, number of unfilled grain per panicle, thousand seed weight (g) and yield (ton/ha) were recorded. Analysis of variance revealed highly significant variation among the genotypes for all the characters under study in both conditions (irrigated and rainfed). The effects of water deficit on various morphological traits associated with drought tolerance were also studied. Result revealed that significant yield decline was observed almost in all rice genotypes grown under rainfed condition compared to normal irrigated situation. Out of twenty rice genotypes, BRRI dhan36, BRRI dhan59, BRRI dhan55 showed superior performance in terms of grain yield and yield attributes under normal irrigated condition. Under rainfed condition, the genotypes namely BRRI dhan55, Gopal Deshi, Soilerpuna showed superior performance in terms of grain yield and yield attributes. Significant variation was also observed among the genotypes for plant height, flag leaf length (cm), flag leaf width (cm), number of primary branches per panicle, number of secondary branches per panicle, panicle length (cm), number of filled grain per panicle, number of unfilled grain per panicle, thousand seed weight (g) and yield (ton/ha) and drought tolerance index under both normal (irrigated) and rainfed condition. The present study also indicated the agro-morphological traits had direct and indirect effect on yield performance of rice genotypes under rainfed condition at reproductive stage. A Thesis submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in partial fulfilment of the requirements for the degree of MASTER OF SCIENCE IN GENETICS AND PLANT BREEDING Mon, 01 Jan 2018 00:00:00 GMT http://localhost:8080/handle/123456789/3232 2018-01-01T00:00:00Z http://localhost:8080/handle/123456789/3231 HETEROSIS AND COMBINING ABILITY ANALYSIS IN Brassica rapa L. FERDOUS, JUBAIDA Field experiment on rapeseed (Brassica rapa L.) involving 7 x 7 full diallel cross including reciprocal were conducted at the Sher-e-Bangla Agricultural University, Dhaka during the winter season of 2018-2019. Heterosis and Combining ability were estimated for seed yield and other related characters such as plant height, days to 50% flowering, days to maturity, no. of primary branches per plant, no. of siliqua per plant, no. of seeds per siliqua, length of siliqua and hundred seed weight per plant. Out of forty-one crosses, the hybrid SAU proposed 4 ×BARI Sar-15 was found to be the best for number of primary branches per plant. While the cross BARI Sar-6 × Local Tori-7 produced maximum number of secondary branches per plant. The cross BARI Sar-6 × Local Tori-7 produced maximum number of siliqua per plant. maximum length of siliqua was found in SAU proposed 4 × BARI Sar-6 whereas BARI Sar-17×BARI Sar-14 produced the highest number of seeds per siliqua. The highest seed yield was also observed in the hybrid Local Tori-7×Yellow Special. Highly significant positive heterosis was found in the cross SAU proposed 4 × BARI Sar-17 over better parent and in SAU proposed 4 ×BARI Sar-15 over mid parent for plant height. The hybrid SAU proposed 4 ×Yellow Special was found to have the best heterotic effect for number of primary branches per plant. Highest significant positive heterosis for number of secondary branches per plant and for number of silique per plant over better parent as well as mid parent was found in BARI Sar-6 × Local Tori-7. Significant negative heterosis over mid parent and better parent was found in SAU proposed 4 and thus these can be used for producing variety with earliness. Highly significant and positive value for both mid parent and better parent was represented by Local Tori-7 × Yellow Special. The variance due to GCA and SCA were highly significant for all the characters studied. The parent BARI Sar-17 was an excellent general combiner for dwarfness. For number of secondary branches, Seed yield per plant and the number of siliqua highly significant and positive GCA effects were observed in Local Tori-7. BARI Sar-17 exhibited the highest significant and positive GCA effects for seed per silique and can be considered as a good general combiner. Yellow Special × SAU proposed 4 was the best specific combiner for dwarfness where as Local Tori-7 × BARI Sar-17 for primary branches per plant and Local Tori-7 × BARI Sar-15 siliqua per plant. Yellow Special × BARI Sar-14 was the best specific combiner for seed yield per plant and SAU proposed 4 ×Local Tori-7 for seeds per siliqua.The GCA and SCA ratio for all the characters except seed yield per plant were more than one indicating that these characters were predominantly under additive genetic control. A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, in partial fulfilment of the requirements for the degree of MASTER OF SCIENCE IN GENETICS AND PLANT BREEDING Mon, 01 Jan 2018 00:00:00 GMT http://localhost:8080/handle/123456789/3231 2018-01-01T00:00:00Z