Sugarcane is the main sugar producing crop in Bangladesh. However, improvement of this crop through breeding is limited due to lack of genetic diversity. Therefore, genetic variability and diversity assessment are necessarily important for the foreign introduced materials. Experiment was conducted with 9 exotic sugarcane genotypes at Regional Station, Bangladesh Sugar Crop Research Institute, Gazipur, during 2012-13, following RCBD. Data were collected on different growth and yield contributing characters. Individual cane weight exhibited high genotypic coefficient of variation and phenotypic coefficient of variation. Leaf blade length, leaf blade width, fresh leaf weight, dried leaf weight, number of tillers, millable cane, bud size, cane diameter, internodes number, internode length, plant height, stalk length, brix%, and individual cane weight showed high heritability. Individual cane weight showed highly significant and positive correlation with cane diameter, internode length, and stalk length, whereas path coefficient analysis revealed that cane diameter had maximum positive direct effect on individual cane weight followed by internode length, number of tillers, and chlorophyll content. Results indicate that the genotypes should be selected on the basis of individual cane weight, cane diameter, and millable canes number for future breeding to get higher sugarcane yield in respect to juice and brix content.

The study was carried out in the field laboratory of the Department of Genetics and Plant Breeding of Bangladesh Agricultural University in order to evaluate varietal performance and genetic variability of fourteen tomato genotypes based on morphological and biochemical characteristics. Tomato genotypes were collected from Genetics and Plant Breeding farm, Bangladesh Agricultural University, Mymensingh. The field experiment was conducted from October 2014 to March 2015 with Randomized Complete Block Design (RCBD) including three replications. Data for genetic analyses were collected on seven traits viz. days to first flowering, pollen grain fertility, days to first fruit maturity, individual fruit weight, plant height, ascorbic acid content and yield per plant. ANOVA showed significant variation among the tomato genotypes for all the traits. Wide range existed between minimum and maximum mean values for all the genotypes whereas genotype World champion had the maximum individual fruit weight with the highest yield. On the other hand, genotype CI-170-0-20-2-0 gave poor performance. Yield exhibited a positive significant correlation with individual fruit weight; and in path coefficient analysis, maximum positive direct effects were found through individual fruit weight followed by plant height, ascorbic acid content and days to first fruit maturity. In principal component analysis, the main three components contributed approximately 79.14% of total variability. Genotypes were classified into five clusters by Ward's method including late maturing and low yielder genotypes in cluster I, early flowering genotypes in cluster II, high yielder with large fruited genotypes in cluster III, genotypes containing low ascorbic acid in cluster IV and genotypes having early maturity with small fruit but minimum pollen grains fertility rate in cluster V. Based on the present findings, World champion and Big cherry were considered as superior varieties among the fourteen genotypes and individual fruit weight might be considered as an important criteria for yield improvement.