Sharma, Ramesh KumarPatel, Pushpam2023-03-072023-03-072022https://krishikosh.egranth.ac.in/handle/1/5810194850The present study was conducted at Vegetable Research Farm of the Department of Horticulture (Vegetable and Floriculture), Bihar Agricultural University, Sabour, Bhagalpur. The investigation was based on combining ability, heterosis and to estimate stable genotypes for planning of an appropriate strategy for development of high yielding bottle gourd lines and F1 (crosses). The line × tester analysis was carried out involving 7 lines viz., BRBG-23, BRBG-65, BRBG- 21-2, BRBG-42-, BGL-19, BRBG-22-1, BRBG-41-1 and 3 testers (Rajendra Chamatkar, Swarna Sneha and Narendra Rashmi). Each line was crossed with each of the tester during March 2019. The evaluation trials of crosses and parents were conducted during three seasons namely August 2020, February 2021 and March 2021 transplanting in randomized block design with 3 replications. The experimental material consisted of 7 parents, 3 testers, 21 F1’s and one check (Narendra Shankar-4). Data was recorded on 13 quantitative, 3 biochemical and 9 morphological traits. In each replication per treatment five plants were randomly selected for observations on plant, fruit and yield characters on individual plant basis. Analysis of variance revealed significant difference among the genotypes for the traits under study. On the basis of pooled over seasons the estimates of variance component revealed that variance due to SCA was more pronounced than variance due to GCA for all the characters under study, indicating the importance of non-additive type of gene action for the expression for those characters. On the basis of pooled over seasons the GCA effect for fruit yield per hectare revealed that line BRBG22-1 was the best general combiner and among testers Narendra Rashmi was the best general combiner. The SCA effect of hybrids for fruit yield per hectare revealed that BRBG-21-1 × Swarna Sneha was the best specific combiner followed by BRBG-65 × Rajendra Chamatkar and BRBG-23 × Narendra Rashmi. Among the 21 crosses, the crosses, BRBG-22-1 × Swarna Sneha, BRBG-22-1 × Narendra Rashmi, BRBG-21-2 × Swarna Sneha and BRBG-23 × Narendra Rashmi showed more than 24 % standard heterosis for fruit yield per hectare. Thus, it was concluded that these crosses were the best and found suitable for higher fruit yield per hectare on the basis of mean performance and heterotic effect for fruit yield per hectare. BRBG-23 × Swarna Sneha, BRBG-65 × Swarna Sneha and Narendra shankar-4 were found stable genotypes for fruit yield per hectare in pooled data of the seasons. Genotypes BRBG-41-1 × Narendra Rashmi for number of primary branches per plant; BRBG-23 × Narendra Rashmi, BRBG-21-2 × Swarna Sneha, BRBG-22-1 × Swarna Sneha, BRBG-22-1 × Narendra Rashmi, BGL-19, BRBG-22-1 for number of node to first male flower; BRBG-23 × Narendra Rashmi, BRBG-42-1 × Swarna Sneha, BRBG-65 for number of node to first female flower; BRBG-23 × Swarna Sneha, BGL-19 × Rajendra Chamatkar, BRBG-41-1 × Swarna Sneha, BRBG-23, BRBG-65, Swarna Sneha, Narendra Rashmi, Narendra shankar-4 for days to first male flower opening; BRBG-23 × Swarna Sneha, BGL-19 × Rajendra Chamatkar, BRBG-41-1 × Swarna Sneha, Swarna Sneha for days to first female flower opening; BGL-19 × Rajendra Chamatkar, BGL-19 for days to first fruit harvest; BRBG-23 × Narendra Rashmi for vine length at the time of final harvesting (m); BRBG-41-1 × Swarna Sneha for length of fruit; BRBG-65 × Swarna Sneha, Narendra Rashmi for number of fruit per vine; BRBG-23 × Rajendra Chamatkar, BRBG-23 × Swarna Sneha, BGL-19 × Narendra Rashmi for weight of fruit; BRBG-23 × Swarna Sneha, BRBG-65 × Swarna Sneha and Narendra shankar-4 for fruit yield per vine; BRBG-22-1 × Swarna Sneha for total Protein; BRBG-23 × Narendra Rashmi, BRBG-65 × Swarna Sneha, BGL-19 × Rajendra Chamatkar, BRBG-22-1 × Rajendra Chamatkar, BRBG-41-1 × Swarna Sneha for fibre content were found stable genotypes.EnglishThesis