Heterosis and Combining Ability of Advanced Generation Lines in Tomato (Solanum lycopersicum L.)
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Date
2011
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UAS, Dharwad
Abstract
An investigation was conducted in the Department of Horticulture, College of
agriculture, Dharwad to study the heterosis and combining ability in tomato (Solanum
lycopersicum L.) with the objectives of identifying good general combiners and to
assess the magnitude of heterosis for sixteen characters and isolation of economic
segregants in double cross F5 population. Among 18 hybrids, three crosses DTHVI-5
(12-1) × DTH5N-3 (4-8) (1528g), DTHVI-5 (12-13)×DTH5N-3 (4-8) (1493.17g) and
DTHVI-5 (12-11) × DTH5N-3 (4-8)} (1411.59g) expressed considerable magnitude
of heterosis for yield. Hybrids DTHVI-5 (12-1) × DTH5N-3 (4-8), DTHVI-5 (12-13)
× DTH5N-3 (1-12) and DTHVI-5 (12-13) × DTH5N-3 (4-8) had high fruit weight
66.63g, 57.53g and 57.00g respectively. None of the hybrids had significant positive
heterisis over commercial check for yield. DTH5N-3 (4-8) was better yielding among
the three testers (1441.97g).
Significantly good GCA was observed in lines DTH5N-3 (4-8) (162.03) for
yield per plant and number of fruits per plant, DTHVI-5 (12-1) (5.17) and DTH5N-3
(4-8) (3.76) for fruit weight. The top three crosses DTHVI-5 (12-1) x DTH5N-3 (4-8),
DTHVI-5 (12-13) x DTH5N-3 (1-12) and DTHVI-5 (12-1) x DTH5N-3 (4-15)
exhibited high SCA effects for total yield per plant. The cross DTHVI-5 (12-5) x
DTH5N-3 (1-12) and DTHVI-5 (12-13) x DTH5N-3 (4-8) exhibited significant SCA
effect for number of fruits per cluster, DTHVI-5 (12-15) x DTH5N-3 (4-8) for
average fruit weight.
Analysis of segregants in nine double cross hybrid populations with regard to
important component characters in tomato revealed that there was higher frequency of
transgressive segregants for number of fruits per plant followed by for fruit weight.
DTH4U-1 x DTH5N-3 (15-11) had higher economic segregants for number of fruits
per plant (40.4%), fruit weight (35.1) and yield per plant (35.2).
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Horticulture