http://localhost:8080/handle/123456789/2794 2026-04-18T16:23:35Z http://localhost:8080/handle/123456789/1060 COMBINING ABILITY AND GENE ACTION IN A 7x7 F2 HALF DIALLEL POPULATION OF Brassica napus L. OMY, SUMAIYA HAQUE Twenty one F2 progenies derived from a 7x7 diallel crosses along with parents were evaluated at experimental site of Sher -e- Bangla Agricultural University for ten yield and yield contributing traits. Due to significant genotypic effects for all the traits, genetic analyses were performed on F2 progenies including analyses of combining ability and genetic components. Out of 21 Fjs, the combinations Nap-20 12x Nap-2022, Nap_2037xNap.-206, Nap-I 79xNap- 206 and Nap-248xNap-2012 showed desirable negative combining ability for the characters of shorter plant height. Nap_248xNap-179. Nap-2057xNap20I2 were good specilic combiner for early flowering. The hybrid Nap248xNap1 79 was the best for early flowering. The cross Nap_2037xNap_2022 was the best for number of primary branches/plant, number of secondary branches, number of siliquae/plant and yield/plant. The cross Nap-206 x Nap-2057 and Nap_248xNap_2057 were the best for siliqua length and number of seeds/siliqua, respectively. For 1000 seed weight the hybrids Nap-I 79xNap_2057 combination is best. The crosses Nap_248x Nap-2022 and Nap_179x Nap-206 were found to be the best for higher oil content %. The parent Nap-2022 was the best general combiner for early flowering, number of primary branches/plant. The parent Nap-248 was the best for 1000 seed weight. Two parents Nap- 179 and Nap-257 were good general combiner for oil content %. On the basis of avcragc score and rank position, the hybrid Nap2037xNap2022 was the best spccific combiner for most of the important characters. The mean sum of square due to SCA was significant for all traits indicating that the non-additive gene actions were predominant for the expression of these characters. The significant mean sum of square due to GCA was also observed for the traits indicating that non additive gene actions were also prevailed. The higher magnitude of SCA variance was observed than that of GCA variance for all the traits. The Vr-Wr graph indicates over dominance (a>O) for number of primary and secondary branches per plant, number of seeds per siliqua and oil content. Partial dominance (a>0) was observed for plant height, days of flowering, number of siliquae per plant, siliqua length, thousand seed weight and seed yield per plant. 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 SEMESTER: JANUARY- JUNE, 2014 2014-06-01T00:00:00Z http://localhost:8080/handle/123456789/1059 CELL COMPATIBILITY ANALYSIS IN POMATO (Solanum tuberosum L. and Solanwn lycopersicum L.) NUSRAT, MOLLIKA FATIMA A field experiment was conducted at the experimental field of Sher-e-Bangla Agricultural University, Dhaka, during November 2013 to April 2014. Four potato (Solanurn tuberosum L.) and three tomato genotypes (Solanum lycopersicum L.) were studied in the present study. The objectives of the study were compatibility analysis of tomato and potato by making pomato plants using cleft grafting and to assess the magnitude of genetic divergence in pomato combinations, association among the characters and their contribution to yield. The analysis of variance indicated significantly higher amount of variability among the combinations for all the characters. Considering genetic parameters high genotypic co-efficient of variation (GCV) was observed for, fruit per cluster, fruit per plant, tuber per plant and fruit yield per plant whereas days to first flowering, days to 50% flowering and tuber yield per plant showed low CCV. High heritability with high genetic advance in percent of mean was obsen'ed for number of fruits per cluster, number of fruits per plant, tuber per plant and fruit yield per plant and tuber yield per plant indicating that these traits were under additive gene control and selection for genetic improvement for these traits would be effective. The results obtained, showed that fruit yield per plant had high positive significant relation with plant height, cluster per plant, fruits per cluster. fruits per plant but high negative significant relation with fruit length and fruit diameter. Days to 50% flowering, number of branches per plant and fruit per cluster had high positively direct effect on yield of tomato. Fruit weight and fruit length had high negative direct effect on yield of tomato. So, these were found to be important characters and could be used on improvement for yield. The highest mean total yield per plant was found in P2TI, P4TI, P3TI and in PITI respectively. It means TI (BARI Tomato- I 1) showed the best compatibility with all the local potato varieties except P4 (Pakri Alu(Tcl). So, BAR! Tomato-I I could be recommended to the pomato growers with local potato varieties. 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 GENETICS AND PLANT BREEDING SEMESTER: JULY-DECEMBER, 2014 2014-06-01T00:00:00Z http://localhost:8080/handle/123456789/1058 IN VITRO PROPAGATION AND VARIABILITY INDUCTION BY MUTAGEN IN GERBERA (Gerbera jamesonii Bolus.) SULTANA, MST. SHAMIRA The study was LtnderL ken Iör estabIisItiin a protocol 11w in i'itro cailtis indtiction, plant regeneration and nititaen sensitivity of two gerbera arieties. This research was held in the tissue culture laboratory ii C icnctics and Plant l3rccding Dvpartnient. Slier-c-Ilangla Agricultural 11ni\ersit\. ShL'r-c-E3ainki N;t'zir. t)haka. flie effect of diflèrcni comb i nat ion and c(micenuatioll 11 N A A .i id H A P on iii sin•o cal his itidtiction and plant regeneration was studied. The concentrations i1>r HA P were Ii) ing/L. 1.5 nig/L and 2.0nig.'L. The concentration for combined NAA and 13AP verel.O nig/L NAA+I.0 m&I. HAP. I .OmgiL NAA+2.0 mg/I .13A1'. It) mg/F. NAA+4.0 mg/I. I3AP. 1.5 mg/L NAA+ 1.0 mg/I. BA!' and 1.50 nit NA •\ 1.5 mg/I. HAP. The Red variety took minimum days (4.00 days) for callus initiation and the largest site (2.77 cm) of callus were Ibtind with the same treatmeni of' 1.51) I NAA 5 tiitl HAl'. The highest weight (3.12 gnu) of callus was noticed in the vartet\ Red ith the treatillent to tug/I. NAA' to mgJL RAP at 42 DAt. In case olshoot iiiiiautiii. i'lliCIN Red took minintuni lime (5.60 days) Followed bs variet\ Yellow (8.74 days). the andy Red produced the maximum number of shoots/plantkt (16.80 shools1flantlell and the longest shoot (8.60 cm) 16110 ed by Yellow ( 13.29 shoots:plantlet :iricl 2.63 cal) at 42 DAI . The Red variety also produced maxinuni number of Icavesp ant let (22.40 leaves ) with the treatment 2.0mg/I I3AP within 42 I)1U. The varict\ Yellow Look nninitnu days (9.31) days) to root initiation thI towed by Red I I .20 days . \Vheii v:tniet and treatment took under considerations, the treatment 1.50 me/I. NAA 1.5 TIM/I BA P ith variety Red produced the maximum 14.70 roots/plantlet). flie longest roots 7.5(j cm) were touitd in the Red variety with the treatment of 1.5 mg/I. NAA '1.1) tug/I. HAl' al .12 t)AI. the investivation ott induction of mutation in vilro was aimed for understanding the eflèct of eheniica I mutagens on the survival percentage of shoot and ubitornialities of leaF'. the survival percentage and the number ol shoots produced Ino it the treated shoot tips ofgerbera decreased with d it'lbrent concentrations ol the EMS used. \l in ri tim percentage 01 sun iva I shoot tips (39.59%) was found ill the ellov vaniet\ ith the concentrations 500 uM EMS. Yellow variety has sho ii niax i mum 60.4 I % mortal it and Red variety shown 69.87% abnormal leaf ith the same coneeluratioli 51)1) 1tM I \ IS. Ilte regenerated plantlets were translerred sticcesslülh in earthen pot and suhsequenhI to soil. fhie sLirvival rate or the plantlets of Red variety was greater than Yellos vartet under cx 'iim conditions. 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 SEMESTER: JANUARY-JUNE, 2014 2014-06-01T00:00:00Z http://localhost:8080/handle/123456789/1057 GENETIC VARIABILITY AND CHARACTER ASSOCIATION IN F5 POPULATION OF Brassica napus L. MILl, SAVEDA MOSAMMAD SALWA KHATUN A field experiment was conducted with 66 F5 genotypes of Brassica napus L. at the experimental field of Sher-e-Bangla Agricultural University, Dhaka to study the genetic diversity, variability, correlation and path coefficient analysis during November 2013 to February 2014. The genotypes were found significantly variable for most of the characters. Comparatively phenotypic variances were higher than the genotypic variances for all the characters studied. Also PCV were higher than the GCV for all the characters studied. Number of secondary branch, thousand seed weight, number of primary branch, number of siliqua per plant and seed yield per plant showed high broad base heritability. The significant positive correlation with seed yield per plant was found in number of siliqua per plant. siliqua length, number of seed per siliqua and thousand seed weight. Path coefficient analysis revealed that 50% flowering, number of siliqua per plant. number of seed per siliqua and thousand seed weight had the positive direct effect on yield per plant. The genotypes were grouped into six clusters. The highest inter cluster distance was observed between cluster IV and VI and the maximum intra cluster distance was found in cluster V. Considering group distance and other agronomic performance genotypes 012. G14. G15. G16, 017. 022 and 024 might be suggested for future hybridization program. 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 SEMESTER: JANUARY-JUNE, 2014 2014-06-01T00:00:00Z