ISHS Acta Horticulturae 637: XXVI International Horticultural Congress: Advances in Vegetable Breeding
GENETIC ANALYSIS OF IMPORTANT FRUIT CHARACTERS OF TOMATO BY INVOLVING LINES POSSESSING MALE STERILITY GENES |
| Authors: | M.S. Dhaliwal, S. Singh, D.S. Cheema, P. Singh |
| Keywords: | Combining ability, genetic improvement, hybrids evaluation, Lycopersicon esculentum Mill., line x tester analysis |
| Abstract:
The present investigation was carried out at the Vegetable Research Farm, Punjab Agricultural University, Ludhiana to study the worth of male-sterile lines of tomato in combination with already identified superior performing male parents. The plant material comprised 40 F1 hybrids obtained by crossing four genetic male sterile (pollen abortive type) lines with 10 male parents in a line x tester fashion. Observations were recorded on number of locules, pericarp thickness, equatorial diameter, polar diameter, TSS, fruit weight and total yield. Analysis of variance for combining ability revealed that the MS due to hybrids was significant at P = 0.01 for all the characters studied. Partitioning of total genetic variability into different components revealed significance of GCA lines, GCA testers and SCA hybrids for all the characters. The ratio of σ2SCA/ σ2GCA indicated a greater role of non-additive gene effects for all the characters except equatorial diameter where additive and non-additive gene effects were, more-or-less, equally important. None of the parents studied exhibited good GCA effects for all the characters studied. Two parents, P 259 and W 321, proved to be good combiners for TSS and total yield. Based upon the inferences drawn, parents L 211, P 259, W 321 and W 322 have been recommended for their utilization in genetic improvement of tomato through pure line breeding. The cross ms 45 VFN 8 x S 282 was identified as the best combiner. The new hybrid not only out-yielded two commercial checks TH 802 and TH 2312 by a margin of more than 50%, but was also either superior or at par with the better check for rest of the characters. | |
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