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Author: DHILLON, HARNOOR KAUR × Start date: 2020 × Type: Thesis ×
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    ThesisItemOpen Access
    Genetic analysis of the bacterial wilt resistant intraspecific hybrids in bell pepper (Capsicum annuum L. var. grossum Sendt.)
    (CSKHPKV. Palampur, 2020-08-11) DHILLON, HARNOOR KAUR; Sood, Sonia
    The present investigation entitled “Genetic analysis of the bacterial wilt resistant intraspecific hybrids in bell pepper (Capsicum annuum L. var. grossum Sendt.)” was carried out at the Experimental Farm of Department of Vegetable Science and Floriculture, CSK HPKV, Palampur to determine reciprocal hybrid differences, heterosis, the effects of general and specific combining abilities, gene action and to identify high yielding bacterial wilt resistant hybrid(s) by following full diallel mating design involving six diverse lines. Parents, their 30 cross combinations along with standard check „Hybrid Indira‟ were evaluated in Randomized Block Design with three replications during summer-rainy season of 2019. Data were recorded on fruit yield with related horticultural traits and reaction to bacterial wilt disease. Sufficient genetic variability was observed for all quantitative and quality traits except bacterial wilt incidence. The diallel analysis revealed significant differences due to parents, hybrids and parents vs hybrids for majority of the traits indicating appreciable diversity in the experimental material. Significant reciprocal differences were observed for all the studied traits except fruit width indicating the importance of correct direction of crossing during hybrid development. A wide variation in magnitude and direction of heterosis was noticed for majority of the traits with maximum manifestation for days to 50% flowering, plant height, fruit length, fruits per plant and marketable fruit yield per plant. Hybrids DPBWRC-6-1 × EC-464107, DPBWRC-6-1 × EC-464115, EC-464107 × DPBWRC-6- 1, DPBWRC-1 × EC-464115 and DPBWRC-6-1 × DPBWRC-29 were the most promising crosses with significant heterobeltiosis and economic heterosis for fruit yield and yield related traits and showed maximum consistency by retaining their ranking among top crosses. Among visually observed characters, dark green, green and yellowish green fruit colour at horticultural maturity, sunken and cordate/lobate fruit shape at blossom and pedicel attachment, respectively and resistance reaction to bacterial wilt disease in all parents and hybrids were recorded. Parents DPBWRC-6-1, DPBWRC-39, EC-464107 and EC-464115 were observed to be good general combiners for fruit yield with component traits. Thus desirable cross combinations involving both or one of these as parents resulted in significant desirable SCA effects and heterosis. DPBWRC-29 × EC-464107, DPBWRC-29 × DPBWRC-1, DPBWRC-39 × DPBWRC-1 and EC-464115 × DPBWRC-29 were most promising crosses on the basis of SCA effects for fruit yield and related traits. The non-additive gene action was predominant for majority of the traits. Thus the improvement of these characters would be effective through heterosis breeding. Based on per se performance, SCA effects and heterosis, DPBWRC-6-1 × EC-464107, DPBWRC-1 × EC-464115 and DPBWRC-6-1 × DPBWRC-29 were the most promising crosses for obtaining superior progenies. Hybridization followed by selection in later generations would be effective future breeding strategy