GENETIC STUDIES ON TRIPLE TEST CROSS PROGENIES FOR HORTICULTURAL TRAITS INVOLVING BACTERIAL WILT RESISTANT GENOTYPES OF BRINJAL (Solanum melongena L.)
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Date
2017-03-29
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CSKHPKV, Palampur
Abstract
Brinjal (Solanum melongena L.) also known as egg plant or aubergine belong to family Solanaceae and one of the most commonly grown vegetable throughout the country. India is considered to be the centre of origin with secondary diversity in China and South East Asia. It is grown commercially as fresh market crop especially in low and mid hill areas of Himachal Pradesh. Inspite of its economic importance, no major strive has so far been made for the improvement of yield and quality traits in this crop. Based on these considerations, the present investigation was, therefore, undertaken to obtain information on the relative magnitude of additive, dominance and epistatic component of genetic variance and average degree of dominance as inferred from the analysis of different traits such as marketable fruit yield per plant, days to 50% flowering, days to first picking, number of marketable fruits per plant, fruit length, fruit diameter, plant height, number of branches per plant, fruit weight, pedicel length, total soluble solids, dry matter content, iron content, phenol content and bacterial wilt incidence by following a triple test cross mating design analysis involving contrasting parents/inbred lines. The experimental material consisted of thirty triple test cross (TTC) progenies of a) SP and H-8, b) AK and BN, c) AN and SN, d) PPC and DPBBWR-2 (Sel-2) developed through the triple test cross mating design proposed by Kearsey and Jink (1968) during Kharif, season 2014. The triple test cross (TTC) progenies of the respective parents were then planted and evaluated along with corresponding original parents/testers (L1 and L2), F1‟s (L3) and F2‟s (Pi lines) in a Randomized Block Design (RBD) with three replications at the Experimental Farm, Department of Vegetable Science and Floriculture, CSKHPKV, Palampur (H.P.) during kharif, 2015. Good quantum of genetic variability has been generated through triple test cross progenies with respect to different traits studied as revealed by the significant analysis of variance. The triple test cross (TTC) progenies viz.,(P1 x L1), (P2 x L3), (P5 x L1), (P7 x L1), (P2 x L1); (P3 x L1), (P4 x L3), (P2 x L2), (P7 x L1), (P3 x L3); (P4 x L1), (P6 x L1), (P3 x L2), (P6 x L3), (P3 x L1) and (P1 x L1), (P9 x L1), (P6 x L3), (P3 x L3), (P8 x L3) manifested high mean values and heterotic effects for fruit yield, quality traits and yield contributing components over the respective better parent/testers in each inter-varietal cross SP x H-8, AK x BN, AN x SN and PPC x DPBBWR-2, respectively. Heterotic effects were observed in almost all the characters studied and supported through genetic analysis of the triple test cross (TTC) progenies, where the preponderance of epistasis, additive and dominance components of genetic variation was observed for marketable fruit yield, quality traits and yield contributing components, revealing thereby the role of additive and non-additive gene action for the inheritance of marketable fruit yield and its component traits which could be exploited through bi-recurrent selection and heterosis breeding for the development of better cultivars possessing high yield and quality traits in brinjal.
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Vegetable Science