Vol. 7, Issue 3 (2019)
Selecting parental lines among monoecious cucumber genotypes for future breeding aiming at downy mildew disease tolerance
Author(s): Shubhashree Priyadarshinee Das, Amit Ranjan Mandal, Swadesh Banerjee, Praveen Kumar Maurya, Tridip Bhattacharjee, Asit Kumar Mandal and Arup Chattopadhyay
Abstract: Cucumber production is threatened by heavy incidence of downy mildew disease during rainy and autumn-winter seasons in the tropics. Identifying and deploying tolerant germplasm are required for cucumber geneticists to develop promising hybrid/variety against this disease. The experiment was undertaken to study different components of genetic variability for 20 growth and yield component traits employing 20 genotypes as well as to screen genotypes against downy mildew disease in Randomized Block Design with three replications. Three genotypes Debstar, Samrat 7 star, and Pusa Barkha showed resistant reactions with less than 10% leaf infection under open field condition. High magnitude of GCV and heritability coupled with high genetic advance as percentage of mean was observed for vine length, intermodal length, nodal position of female flower, number of fruits per plant, average fruit weight, sex ratio, seeds per fruit, 100 seed weight, total sugar content, vitamin C content and percent disease index (PDI) of downy mildew, and thus selection may be rewarding for further improvement of these traits. Number of fruits per plant, seeds per fruit and fruit weight were identified as important selection indices. Based on the divergence study all the twenty genotypes grouped into 5 clusters. The pattern of distribution of genotypes from diverse geographical region into different clusters was random. The character PDI of downy mildew disease contributed maximum towards the divergence followed by vitamin C content, seeds per fruit, fruit yield per and fruit diameter. Based on multivariate analysis and average performance for fruit yield per plant and downy mildew disease severity, six genotypes Debstar, Samrat 7 star, Pusa Barkha, PCUC-8, Swarna Ageti, and Pusa Uday could be identified as potential donors for utilization in future breeding of cucumber to develop high yielding disease resistant hybrid/variety.
Pages: 4073-4085 | 276 Views 72 Downloads
download (8833KB)
How to cite this article:
Shubhashree Priyadarshinee Das, Amit Ranjan Mandal, Swadesh Banerjee, Praveen Kumar Maurya, Tridip Bhattacharjee, Asit Kumar Mandal, Arup Chattopadhyay. Selecting parental lines among monoecious cucumber genotypes for future breeding aiming at downy mildew disease tolerance. Int J Chem Stud 2019;7(3):4073-4085.
