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Inheritance of Quantitative Characters in Tomato (Lycopersicon esculentum Mill)

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Author(s): Adams Frimpong | Osei Safo-Kantanka

Journal: Pakistan Journal of Biological Sciences
ISSN 1028-8880

Volume: 9;
Issue: 15;
Start page: 2770;
Date: 2006;
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Keywords: Tomato | Lycopersicon esculentum | quantitative characters | additive gene effect

ABSTRACT
Productivity of tomato, Lycopersicon esculentum Mill, can be reduced substantially by rampant flower abortion. Inheritance and heritability of high fruit set and yield were studied to develop efficient methods for breeding improved cultivars. High fruit setting (Cherry) and Low fruit setting (NR1, NR2, NR44 and NR46) tomato genotypes were chosen for studies of high fruit set, yield and good plant stature (determinate). Parental genotypes, F1, F2 and backcross progenies were evaluated under field conditions at the Horticultural Science Department of the Kwame Nkrumah University of Science and Technology, Kumasi during the 1998 and 1999 cropping seasons. Data on vegetative and yield components were recorded for the parentals, F1, F2 and backcross populations. Cherry had higher mean values than the NR-Lines for all the characters except average fruit diameter, average fruit weight and total fruit weight per plant. Hybrid yields of 11.2-42.0 t ha-1 was recorded compared with 16-22.0 t ha-1 recorded for the parentals. Narrow-sense heritabilities obtained from variance components of vegetative and yield traits were generally low to moderate indicating that all these traits were influenced by additive genes and environment will have much influence on such traits. In order to develop varieties with good agronomic characters, acceptable fruit yield and sizes, single seed descent with progeny row testing and selection must be used since backcrosses is not suitable for fixing such traits.
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