http://localhost:8080/handle/123456789/2773 Sat, 18 Apr 2026 16:16:08 GMT 2026-04-18T16:16:08Z http://localhost:8080/handle/123456789/817 VARIABILITY CORRELATION AND PATH ANALYSIS IN SEGREGATING POPULATION OF Brassica rapa OBTAINED THROUGH INTERVARITAL CROSSES ARA, SHIFAT A research was conducted by using eight F2& eight F4 populations generated through inter-varietal crosses, along with three check varity of Brassica rapa and grown in the experimental farm of Sher-c-Bangla Agricultural Unriversity. Dhaka, during November 2009-March 20010 to study the variation in different characters, correlation between pairs of different characters and the direct and indirect effect of different characters on seed yield per plant of the F2 & F4 materials to select the plants with higher potential. From the values of mean, range and CV (%) of seed yield and yield contributing characters it was confirmed that there were considerable variation present among all the genotypes used in the experiment. It was shown that more seggregation present in P2 material than F4 material. The values of phenotypic variances were higher than the corresponding genotypic variances. I)ays to 50% flowering, days to maturity, number of primary branches per plant, number of secondary branches per plant, length of siliqua, number of seeds per siliqua. thousand seed weight and yield per plant showed least difference between phenotypic and genotypic variances. The values of GCV and PCV indicated that there was least variation present among most of the characters. The days to maturity, length of siliqua, seeds per siliqua, thousand seed weight showed high heritability with low genetic advance and genetic advance in percentage of mean. Yield per plant had significant and highest positive correlation with length of siliqua, seeds per siliqua and thousand seed weight. The path co-efficient analysis revealed that siliquae per plant had the highest positive direct eRect followed by number of secondary branches per plant, days to 50% flowering, length of siliqua, and plant height. Sixteen most promising plants with short duration and higher yield were selected from eight crosses of the F2 populations of Brassica rapa & forteen most promising plants with short duration and higher yield were selected from eight crosses of the F4 populations A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka- 1207 In partial flulfiliment of the requirements for the degree of MASTER OF SCIENCE r IN GENETICS AND PLANT BREEDING SEMESTER: JANUARY - JUNE, 2010 Tue, 01 Jun 2010 00:00:00 GMT http://localhost:8080/handle/123456789/817 2010-06-01T00:00:00Z http://localhost:8080/handle/123456789/816 VARIABILITY, CORRELATION AND PATH CO-EFFICIENT ANALYSIS OF BITTER GOURD (Momordica charantia L.) TALUKDER, SHAHNEWAZ ALAM Seventeen genotypes of bluer gourd (Momordica charantia L.) were studied in a field experiment conducted at the experimental field of Sher-e-Bangla Agricultural University. Dhaka. during April 2009 to September 2010. The objectives of the study were to measure the variability among the genotypes for yield and yield contributing characters, estimate genetic parameters, association among the characters and their contribution to yield. There was a great deal of significant variation for all the characters among the genotypes. Considering genetic parameters high genotypic co-efficient of variation (GCV) was observed for branches per vine, yield per plant and number of fruit per plant whereas low genotypic co-efficient of variation (GCV) was observed for days to first male and female flowering. In all the cases, it was found that phenotypic coefficient of variation was greater than genotypic co-efficient of variation. }lighest genotypic and phenotypic co-efficient of variation was observed in branch per vine, fruit length, fruit weight and number of fruit plant which indicated a wide variability among the genotypes and offered better scope of selection. The results obtained showed that fruit length showed low direct and positive effect on yield per plant and indirect positive effect on yield per plant via fruit diameter and average fruit weight. Similar result was found for fruit diameter. Average fruit weight and number of fruits per plant showed high direct and positive effect on yield per plant. Path analysis revealed that average fruit weight, number of fruits per plant, days to male flowering and fruit length had positive direct effect on fruit yield. Hybridization between the genotypes of cluster II and cluster VI will manifest maximum heterosis and create wide genetic variability. The highest heterosis would be manifest in cross combination involving the genotypes belonging to divergent clusters. Considering group distance and the agronomie performance, the inter genotypic crosses between G2& 65; G2&G14;O I 4&G I 5:G2&G I 5;G I 0&G II ;G I 0&Gl 3:611 &Gl 3;G5&G I 5;G5&G I 4;might be suitable choice for future hybridization programme. A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, in partial flultiliment of the requirements for the degree of MASTER OF SCIENCE (MS) IN GENETICS AND PLANT BREEDING SEMESTER: January-June, 2010 Tue, 01 Jun 2010 00:00:00 GMT http://localhost:8080/handle/123456789/816 2010-06-01T00:00:00Z http://localhost:8080/handle/123456789/815 COMBINING ABILTY AND HETEROSIS THROUGH LINE X TESTER ANALYSIS IN Brassica napus L. HASSAN, OLIUL The study was conducted to evaluate six female parents (CMS lines) and 3 male parents (testers) in a line x tester mating design at the research field of Sher-e-Bangla Agricultural University, Dhaka, during November 2009 to March 2010 to estimate their combining and heterosis. The data recorded on 18 F1 s and their parents for their combining ability indicated that (ICA effect was significant for days to fifty percent flowering, plant height, No. of siliqua per plant, seed per siliqua, primary branch & secondary branch per plant and seed yield per plant . The specific combining ability (SCA) effect was significant for all the characters. High ratio of SCA and GCA variance was observed, indicating preponderance of non additive gene effects in the inheritance of the yield and yield relating characters under study. Among the lines, CMS2, CMS3 and CMS5 were found as good general combiners. But seven hybrids exhibited good specific combiner among eighteen hybrids. Different types heterosis i.e. heterosis over mid parent (Hm), heterosis over better parent (Rb) and heterosis over standard check (HC) were estimated to evaluate eighteen hybrids for seed yield and yield related characters, where BARI Sharisha-7 was taken as check. The average heterosis for seed yield of eighteen hybrids over mid parent was 19.26% and that of better parent and standard check was 7.96% and 73.90%, respectively. Sixteen hybrids out of eighteen showed higher plant height than the standard check variety. 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 SEMESTER: Jan-Jun, 2010 Tue, 01 Jun 2010 00:00:00 GMT http://localhost:8080/handle/123456789/815 2010-06-01T00:00:00Z http://localhost:8080/handle/123456789/808 GENETIC DIVERSITY, CORRELATION AND PATH CO-EFFICIENT ANALYSIS IN COUNTRY BEAN (Dolichos lablab L.) BEGUM, FATEMA fwenty six genotypes of Country bean (Do/ichos labia/i L.) were studied at the experimental farm of Sher-e-Bangla Agricultural University. Dhaka, during October 2009 to March 2009. The objectives of the study were to measure the variability among the genotypes for yield and yield contributing characters, estimate genetic parameters, association among the characters and their contribution to yield. There was a great deal of significant variation for all the characters among the genotypes. High genotypic co-efficient of variation (CCV) was observed for pod width, inflorescence length, pod per inflorescence whereas low genotypic co-efficient of variation (('CV) was observed for seed Nvidth, seed length, days to first flowering. In all cases, phenotypic variances were higher than the genotypic variance. Heritability with low genetic advance in percent of mean was observed in seed width which indicated that non-additive gene effects were involved for the expression of this character and selection for such trait might not be rewarding. High heritability with high genetic advance in percent of mean was observed for pod width, inflorescence length indicated that this trait was under additive gene control and selection for genetic improvement for this trait would be effective. Correlation studies revealed that the highest significant association of yield per plant was observed with pod length, pod weight, pods per plant, inflorescence per plant. Path co-efficient analysis revealed the maximum direct contribution towards yield per plant was with pod weight followed by pods per plant, pod width and number of flower per inflorescence. The highest intra-cluster distance was found in cluster IV and lowest in cluster 1. Among five clusters, the highest inter-cluster distance was observed between cluster I and cluster TI and the lowest between cluster Ill and cluster IV. Considering all the characters the 67 (1313-8832). G (1113-7985), G3(1313-8034) and G15 (BD-8816) were selected for thture breeding programme. 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 SEMESTER: Jan-Jun, 2010 Tue, 01 Jun 2010 00:00:00 GMT http://localhost:8080/handle/123456789/808 2010-06-01T00:00:00Z