http://localhost:8080/handle/123456789/2749 2026-04-04T11:53:49Z http://localhost:8080/handle/123456789/5305 GENETIC VARIABILITY AND CHARACTER ASSOCIATION ANALYSIS OF F 3 , BC 1 F 2 AND BC 2 F 1 POPULATIONS IN INDIAN MUSTARD (Brassica juncea L.) RAHMAN, MD. ZAHIDUR The investigation was carried out to estimate the variability and correlation among the yield attributing traits of twenty-one F 3 , seventeen BC 1 F 2 and seven BC 2 populations of Indian mustard. The experimental set up was organized at Sher-e-Bangla Agricultural University, Dhaka during the Rabi season 2022/23 for evaluation of these populations which was preceded by a generation advancement and a backcross program performed in previous Rabi 2021/22 through which the seeds for these populations were developed. In the study twelve yield attributing traits were observed and they had shown significant variation among all the populations. Considering the mean performance G1 (26.44 gm) of BC 1 F 2 population showed the highest yield per plant among all the populations, whereas G10 (19.89 gm) of F 3 F 1 and G6 (23.33 gm) of BC 2 represented the top position within F 3 and BC 2 F 1 populations for yield per plant respectively. For earliness G20 (93 DAS) of F 3 population required the minimum duration for crop maturity among all the populations followed by G1 (94.67) of BC 1 For short plant G2 (131.67 cm) of F 3 population showed the most promising result. A lower environmental variance was found to be associated with all of these traits. Majority of the traits had also shown a higher phenotypic coefficient of variation and genotypic coefficient of variation. Higher heritability as well as higher genetic advance was also found to be associated with all of the traits and among them the maximum heritability coupled with a higher genetic advance as percentage of mean was observed with yield per plant (98% and 63.26%) and number of primary branches per plant (98% and 62.70%). Finally, the correlation study revealed that plant height (0.52), number of primary branches (0.66), number of secondary branches (0.66), siliquae length (0.30), thousand seed weight (0.60) and harvest index (0.30) had a highly significant correlation with yield in a positive manner. Furthermore, the path coefficient study unveiled that, majority of the traits had a positive direct effect on the yield among which the number of primary branches (0.578) had the maximum direct effect along with a highly significant positive correlation with the yield. Considering altogether, G1 and G5 of BC 1 F 2 and G10 and G20 of F 3 populations could be taken into account for further evaluation to develop high yielding and early maturating population, as well as G2 of F 3 population might be considered for developing population with short plant stature. 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 2022-01-01T00:00:00Z http://localhost:8080/handle/123456789/5304 GENETIC DIVERSITY ANALYSIS OF YIELD AND YIELD CONTRIBUTING TRAITS OF TOMATO (Solanum lycopersicum L.) LUBNA, TUBA YASMIN This study was conducted using twenty tomato genotypes to assess the performance of yield and yield related characters during the period from November, 2022 to April, 2023. Analysis of variance was noticed highly significant of differences for all the studied characters. Phenotypic coefficient of variation (PCV) was recorded higher for all the parameters than the genotypic coefficient of variation (GCV), suggesting environmental influences on the exposure of all the traits. High heritability was found for all the characters. High heritability along with high genetic advance in percent of mean was noted for no of branches per plant, clusters per plant, flowers per cluster, fruits per cluster, fruits per plant, fruit weight fruit length, fruit diameter, and fruit yield per plant, indicating the presence of additive gene action and suggesting that, there is a possibility of simple selection based on those character in further breeding. The correlation coefficient showed that, fruit yield per plant had positive and significant correlation with fruits per plant (G=0.85, P=0.82), fruit weight (G=0.76, P= 0.74), fruit length (G=57, P=55), fruit diameter (G=0.79, P=0.76). The path coefficient analysis revealed that, days to first flowering (3.427), fruits per cluster (0.139), fruits per plant (1.426), fruit weight (0.239), and fruit diameter (0.572) had positive and direct effect on the fruit yield per plant. Cluster analysis of the twenty tomato genotypes produce three different clusters. Cluster I, cluster II, cluster III had the six, five and nine genotypes, respectively. Cluster II was found to present the highest value for intra-cluster distance (3.85) and the maximum inter-cluster distance was noted between the cluster I and cluster III, which is (6.98). Considering the magnitude of cluster mean and agronomic performances of the tomato genotypes, from the cluster III, G7 (BD-7276) for minimum plant height, G4 (BD-7265) for maximum weight of fruit, G8 (BD-7277) for minimum days to first flowering, days to 50% flowering, and days to maturity; and from the cluster II G18 (BARI- 17) for clusters per plant, flowers per cluster, fruits per cluster, fruits per plant, fruit length, fruit diameter, and fruit yield per plant could be selected for further breeding program. 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 2022-01-01T00:00:00Z http://localhost:8080/handle/123456789/5303 CHARACTERIZATION AND GENETIC DIVERSITY ANALYSIS OF YIELD AND YIELD CONTRIBUTING PARAMETERS IN BRINJAL GENOTYPES ZABBAR, MD. ABDUL The field experiment was carried out to assess the genetic variability, heritability, genetic advance, correlation, path co-efficient and genetic diversity for fifteen yield and yield contributing traits in twenty brinjal genotypes. The study was conducted at Sher-e-Bangla Agricultural University in Dhaka from November 2021 to June 2022 using a Randomized Complete Block Design (RCBD) with three replications. In this experiment, the existing genotypes showed significant differences for all characters. The phenotypic co-efficient of variation (PCV) was higher than the genotypic co-efficient of variation (GCV) for all the studied characters. The highest PCV (68.60) and GCV (59.50) were found in percent of brinjal shoot and fruit borer infestation. High heritability associated with high genetic advance and high genetic advance in percentage of mean was found in plant height, individual fruit weight and percent of brinjal shoot and fruit borer infestation, which suggested that phenotype-based selection would be effective. Character association assessments revealed that fruit yield per plant had the most significant positive correlation with days to last harvesting (r g xiii = 0.495, r p = 0.454), number of secondary branches per plant (r g =0.356, r p =0.315), leaf blade length (r g = 0.714, r p = 0.462), leaf blade width (r g = 0.674, r p = 0.498) and number of fruits per plant (r g = 0.798, r p = 0.787) in both genotypic and phenotypic levels. Path analysis found that the number of fruits per plant (1.421) had the most positive and direct influence on yield per plant. Twenty brinjal genotypes were classified into five groups using principal component analysis, D cluster analysis. Clusters I, II, III, IV, and V each have three, three, four, six, and four genotypes. Cluster III had the highest intra-cluster distance (1.918), whereas the highest inter-cluster distance (95.69) was found between clusters II and V. Mean performance of cluster revealed the highest number of fruits per plant (13.45) and yield per plant (0.71) found in cluster IV. Considering cluster distances, character contribution to divergence, magnitude of cluster mean performance and genetic parameters, the genotypes G10 and G20 from cluster III, G11 and G8 from cluster II, and G5 along with G18 from cluster IV might be used in future breeding programs. 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 2022-01-01T00:00:00Z http://localhost:8080/handle/123456789/5302 EFFECT OF SALT STRESS ON MORPHO-PHYSIOLOGICAL TRAITS OF OKRA GENOTYPES (Abelmoschus esculentus L.) ZOHRA, FATEMA TUZ An experiment was undertaken in the Department of Genetics and Plant Breeding, SAU, Dhaka, to select salt-tolerant okra genotype during August 2022 to April 2023. Salt experiment with eight okra genotypes treated with T 0 ds/m) and T 3 ix (control), T 1 (3 ds/m), T 2 (9 ds/m) salt folding CRD design. Genotype stress relationship was assessed using agromorphogenic and physiological characteristics. T 0 and T 0 V 7 V 1 (35.00 days) had the shortest initial blooming times while longest time taken for first flowering was found in T 3 whereas T 0 longest in T 3 In T 0 T 3 V 8 V 1 , T 0 , T 3 V 4 V 1 , T 0 V 4 V 5 V 5 , T 0 and T 3 , T 0 V 6 and T 3 V 7 V 2 , T 0 V 3 (20.0g) was recorded in T 0 , T 1 V 1 V 4 (43 days). T 1 and T 1 V 5 V 6 (6 (35.00 days) took 48 days to blossom 50%, took 41 days. First fruit setting took the (46.00 days) and the quickest in T 0 V 7 and T 0 V 8 V 1 and T 0 V 5 (38.00 days). the highest fruit number (9.00) per plant whereas had the lowest (3.00). The maximum individual fruit weight V 2 and T 0 V 3 The maximum fruit length was 13.63 cm in T 0 The lowest fruit diameter (14.32 mm) was in T 3 in T 0 V 2 , T 0 V 3 18.00 gm in T 3 , T 0 V 5 V 4 while the lowest was 6.67g in T 3 V 3 V 5 and T 3 and the lowest was 8.03 cm in T 3 V 5 , while the biggest (20.69 mm) was . Maximum yield per plant was 158 gm in T 0 V 2 V 7 V 4 and lowest was . When salinity and okra genotypes interact, physiological traits vary. The SPAD value was greatest in T 0 experiment results showed that V 6 V 4 (55.33) and lowest in T 3 V 7 (29.58). Salinity (OK 285 Okra) responded well under T 2 treatment, suggesting suitable for mild to moderate saline prone areas. V 8 and V 3 (Hira) worked well in T 2 prone areas. 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 2022-01-01T00:00:00Z