Genetics of yield, quality and shelf life characteristics in tomato under normal and late planting conditions |
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Authors: | Naveen Garg Devinder S Cheema Ajmer S Dhatt |
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Institution: | (1) Department of Vegetable Crops, Punjab Agricultural University, Ludhiana, Punjab, 141 004, India |
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Abstract: | Seventy nine genotypes of tomato (15 lines, four testers and their 60 F1 hybrids produced in line × tester fashion) were evaluated under normal (E1) and late planting (E2) conditions in the Department of Vegetable Crops, Punjab Agricultural University, Ludhiana, India, to determine the nature
of gene action controlling yield, quality and shelf life characteristics and to identify a few good combiner genotypes which
may be used in further breeding programmes to extend the fruit availability period of tomato in North Indian plains. The lines
were significantly different from testers for most of the characters thereby justifying the choice of testers. Additive gene
action was predominant for days to ripening, total yield per plant, marketable yield per plant, number of fruits per plant,
average fruit weight, fruit shape index and lycopene in both the environments, whereas non-additive genetic variance predominated
in controlling firmness index, number of locules, pericarp thickness, alcohol insoluble solids (AIS), dry matter, total soluble
solids (TSS), titratable acidity, TSS:Acid ratio, pH, ascorbic acid and shelf life, under both normal and late planting conditions.
The best general combining ability (gca) effects, among females, in respect of yield per plant were shown by Spectrum in E1 and by LT-42 in E2. Among the testers, the best gca values in both the environments were possessed by nor-RM-1 for total yield per plant, marketable yield per plant, number of fruits per plant, dry matter and TSS; by rin-RM-2 for firmness index, pericarp thickness and alcohol insoluble solids; by alc-IIHR-2050 for average fruit weight, number of locules and shelf life and by alc-IIHR-2052 for lycopene. The gca of ripening mutants had a nice consonance with their per se performance for most of the characters
indicating that additive gene action was operative in these mutants for majority of the traits. |
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Keywords: | Combining ability Gene action Quality Shelf life Tomato Yield |
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