Browsing by Author "HOSSAIN, AFSANA"

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ANALYSIS OF GENETIC VARIABILITY AND CHARACTER ASSOCIATION IN F 2 SEGREGATING POPULATION OF TOMATO (Solanum lycopersicum L.)
(DEPARTMENT OF GENETICS AND PLANT BREEDING, 2022) HOSSAIN, AFSANA
An experiment was conducted at the experimental farm of Sher-e-Bangla Agricultural University, Dhaka, during the period from September 2021 to February 2022 using twenty-eight genotypes of tomatoes (Solanum lycopersicum L.) to analyze the genetic variability and character association in F population of tomato in a randomized complete block design with three replications. The analysis of variance revealed significant differences for various traits among the genotypes. For all of the characters, phenotypic variance was greater than the genotypic variance. The GCV values were lower than that of PCV values, indicating that the environment had an important role on the expression genes controlling these characters. The number of cluster per plant (35.033), number of fruits per cluster (47.347), number of fruits per plant (81.5), fruit diameter (41.008), single fruit weight (66.156), total soluble solid (53.131) and yield per plant (41.691) all had high genotypic co-efficient of variation (GCV). It indicated that selection may be effective based on these characters. High heritability with high genetic advance in percent of mean was observed in number of fruits per cluster (73.667 and 83.714 respectively), number of fruits per plant (85.669 and 89.897 respectively), fruit diameter (93.326 and 81.609 respectively), single fruit weight (96.603 and 79.649 respectively) and total soluble solid (72.553 and 93.227 respectively) indicating the most suitable condition for selection. It also indicates the presence of additive genes in these traits and reliable crop improvement through selection of such traits is possible. High heritability with low genetic advance in percent of mean was observed in plant height (87.719 and 30.99 respectively), days to 1 2 st fruiting (81.845 and 26.508 respectively), fruit length (88.531and 57.068 respectively) and shelf life (81.168 and 44.243, respectively) suggesting nonadditive gene action for the expressions of these characters. The result revealed a highly significant positive correlation with days to 1 st fruiting (rg = 0.224, rp = 0.227), number of branches per plant (rg = 0.422, rp = 0.498), number of cluster per plant (rg = 0.231,rp = 0.244), number of flowers per plant (rg = 0.242,rp = 0.366), number of fruits per plant (rg = 0.418,rp = 0.447), fruit diameter (rg = 0.553,rp = 0.367), single fruit weight (rg = 0.734,rp = 0.524) and total soluble solid (rg = 0.332,rp = 0.266) indicating that a possible increase in these traits tends to increase in fruit yield per plant. In path analysis data on various parameters viz. plant height (0.183), days to 1 st flowering (0.764), days to maturity (0.305), number of cluster per plant (0.892), number of flowers per cluster (0.684), number of fruits per cluster (0.936), fruit length (0.753), fruit diameter (0.575), single fruit weight (0.75) and total soluble solid (0.178) had revealed positive direct effect on yield. Among these, number of cluster per plant, number of fruits per cluster, number of fruits per plant, fruit diameter, single fruit weight and total soluble solid had also significant positive correlation with yield per plant at genotypic level, indicating direct selection may be executed considering these traits as the main selection criteria to reduce indirect effect of the other characters during the development of high yielding tomato variety. Therefore, considering the agronomic and genetic performance the G genotype for high yield, and G 9 ×G genotype for short durated ripen fruits might be suggested for further selection in next generation.
MANAGEMENT OF SHEATH BLIGHT (RHIZOCTONIA SOLANI) OF RICE THROUGH SELECTED CHEMICALS AND SOIL AMENDMENT
(Department of Plant Pathology, Sher-e-Bangla Agricultural University, 2007-12) HOSSAIN, AFSANA
Efficacy or fourteen treatments viz. T1 (Bavistin 50 WP). T2 (Tilt 250 EC), T3 (Champion 77 WP), T4 (Cupravit 50 WP), T5 (Bleaching powder, BP), T6 (Bavistin 50 WP+ BP), T7 (Tilt 250 EC+ BP), T8 (Champion 77 WP+ BP), T9 (Cupravit 50 WP + BP), T10 (Ash)~ T11 (Sawdust), T12 (Khudcpana), T13 (Poultry manure) and T14 (Control) were assessed against Rhizoctonia solani for the management of sheath blight of rice (BR 3) during March to August, 2007 at the farm of Shcr-c-Bangla Agricultural University (SAU), Dhaka. Effect of different treatments against sheath blight of rice differed significantly in terms of 0/o Relative Lesion Height (RLI·n, number of infected tiller per hill, lesion size. length of paniclc, number of filled and unfilled grain, grain yield (ton/ha), straw yield (ton/ha) and weight of l 000 grains weight. Among the treatments tested, T 6 AMENDMENT ABSTRACT (Bavistin SO WP + BP) showed the best performance in reducing disease incidence and disease severity as well as increasing yield of rice followed by T7 ( I'ilt 250 EC + BP) and T (Champion 77 WP + BP). The treatment T6 (Bavistin 50 WP + BP) reduced upto 54.09o/o RLH and increased grain yield by 37.34% over control which was followed by Tilt 250 EC + BP (52.12%. 32.62%) and Champion 50 WP+ BP (49. l 0%. 31.94%), respectively. The fungicides alone also showed better performances but the soil amendment alone had no remarkable effect in controlling sheath blight of rice.