STUDIES ON HETEROSIS AND COMBINING ABILITY FOR YIELD AND YIELD ATTRIBUTES IN TOMATO (Solanum lycopersicum L.)
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Date
2019-07-30
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UNIVERSITY OF AGRICULTURAL SCIENCES RAICHUR - 584 104
Abstract
The present investigation entitled “Studies on heterosis and combining ability for
yield and yield attributes in tomato (Solanum lycopersicum L.)” was carriedout at New
Orchard, Main Agricultural Research Station, Raichur, Karnataka, during the year 2018-
19. Six genotypes (inbred lines) of tomato were selected on the basis of contrasting
morphological and quality characters. All six parents viz., P1, P2, P3, P4, P5 and P6 were
crossed by following full diallel fashion with reciprocals, to obtain 30 F1 hybrids. The
experiment was laid out in Randomized Block Design, with two replications. All the 30
F1 hybrids along with their parents and standard check (Indam 13201) were raised during
Kharif, 2018.
Results revealed that, parent P1 and P6 exhibited the highest mean fruit yield per
plant. Among the hybrids, P5 × P6, P5 × P3 and P4 × P3 recorded the highest mean total
yield per plant. Estimates of general combining ability effects showed that parent P6
followed by P5 were the best general combiner as they showed significant gca effects in
desirable direction. The cross P5 × P6 was the only cross which showed high sca as well
as high per se performance for majority of the yield and yield contributing traits. The
standard heterosis ranged from ˗18.27 (P4 × P6) to 65.38 per cent (P5 × P6). Out of 30
cross combinations, three cross combinations P5 × P6 (65.38 %), P4 × P3 (33.01 %) and P5
× P3 (30.77 %) showed significant and positive standard heterosis for fruit yield per plant.
Fruit yield per plant had positive and highly significant association at both phenotypically
and genotypically with plant height, number of branches per plant, number of clusters per
plant, number of fruits per plant and fruit length
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