Heterotic response and combining ability for yield & quality attributes in tomato (Lycopersicon esculentum Mill.)
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Date
2016
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Publisher
CCSHAU
Abstract
Sixty hybrids were developed by crossing four testers with each of the fifteen lines in Line x Tester
design at Vegetable Research Station, CCS Haryana Agricultural University, Hisar. The potent lines viz.,
11/TODVAR-1, 11/TODVAR-3. H-86, 12/TODVAR-2, 12/TODVAR-8 and NP-NILD registered highest
positive gca effects for quantitative attributes plant height and no. of primary branches per plant; yield per plant
and early yield per plant (desirable negative effects); flower per truss and fruit per truss; single fruit weight; fruit
diameter, and fruit per plant respectively. For quality characters, the lines 11/TODVAR-7, 12/TODVAR-3,
11/TODVAR-3, 12/TODVAR-6, and NP-NILD registered highest positive gca effects for fruit firmness,
pericarp thickness and no. of locule per fruit; juice yield per fruit and titratable acidity; pulp weight per fruit, and
TSS and ascorbic acid respectively. Among testers, Punjab Ratta, BL-982, DVRT-2, and Punjab Barkha Bahar-2 registered highest positive gca effects for plant height and fruits per plant; primary branches per plant and
days to 50% flowering (desirable negative effect); single fruit weight and fruit diameter, and early yield per
plant and yield per plant respectively. For quality traits, the testers BL-982, DVRT-2, Punjab Ratta and Punjab
Barkha Bahar-2 registered highest positive gca effects for juice yield per fruit; titratable acidity and ascorbic
acid; pulp weight per fruit and titratable acidity; pericarp thickness, and fruit firmness and no. of locule per fruit
respectively. Those few hybrids viz., 11/TODVAR-1 x Punjab Barkha Bahar for plant height, H-86 x DVRT-2
and 11/TODVAR-6 x Punjab Barkha Bahar-2 for number of primary branches/plant, EC-402255 x DVRT-2 for
number of flowers/truss, EC-402255 x DVRT-2 for number of fruits/ truss, 12/TODVAR-8 x DVRT-2 for
single fruit weight , NP-NILD x Punjab Ratta for Fruit per plant, 12/TODVAR-2 x BL-982 for early yield per
plant, 12/TODVAR-2 x BL-982 for yield per plant and 12/TODVAR-2 x BL-982 for juice yield per fruit,
exhibiting high per se performance also showed high heterotic performance over the commercial checks
implying the role of heterosis for selection of best cross combination coupled with significant sca effects for
corresponding character.
Description
Keywords
Fruits, Planting, Yields, Heterosis, Developmental stages, Biological phenomena, Crossing over, Hybrids, Vegetables, Genetics