Field performance and genetic analysis of selected tomato (Lycopersicon esculentum Mill.) genotypes

Abstract

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.

Evaluation and Estimation of Genetic Divergence of Tomato Hybrids by Using Principle Component Analysis and Cluster Analysis Under High Temperature

“…Chernet et al (2014) assessed the performance of 36 Solanum lycopersicum lines by using PCA and obtained 6 PCs which explained 83.03% of the overall variation present. Similar type of findings was also reported by Mitul et al (2016) who found 79.16% variability from the first three PCs. These findings evidently showed that principal component analysis in correspondence to classification of genetic-resources also displayed specific characters for desired able selection in tomato breeding programs.…”

“…It is quite clear from the present investigation that cluster analysis could be used an effective statistical in order to classify various genotypes and extracts reliable results for the selection of breeding material to carry out future tomato hybridization programs as previously reported by (Bernousi et al 2011;Iqbal et al 2014). Mitul et al (2016) found five clusters of tomato genotypes on the basis of various morphological, biochemical and flowering traits such as low yield and late ripening, early flowering types, bug fruited with high yielding capability, lower ascorbic acid content and little fruited with early maturing capability in C-I, C-II, C-III, C-IV and C-V, respectively.…”

Studies of Genetic Variability of Tomato (Solanum lycopersicum L.) Hybrids under Protected Environment

“…Based on days to first picking none of the genotypes was found significantly earlier than the Check Palam Tomato Hybrid-1. Considerable variation for this character was also reported earlier (Chapagain et al, 2011;Patel et al, 2013;Mitul et al, 2016).…”

“…The differences in total soluble solids were due to variations in genotypes and environmental conditions that prevailed during the growing seasons. Significant variability among the tomato genotypes for this trait was also observed by many earlier researchers Mitul et al, 2016;Rai et al, 2016;Prakash et al, 2019).…”

Genetic diversity analysis and construction of selection index of selected tomato genotypes

“…Tomato (Solanum lycopersicum L.) is a member of Solanaceae family (Sharma et al, 2019) and belongs to the genus Lycopersicum (Mital et al, 2016). It is generally accepted that tomato originates within the new world (The America), that is the Andean region comprising Bolivia, Chile, Colombia, Ecuador, and Peru (Blanca et al, 2012).…”