Estimation of genetic parameters and heritability for yield and yield components in tomato through generation mean analysis
2022
Safaee, Meysam | Olfati, Jamal-Ali | Hamidoghli, Yousef | Rabiei, Babak
Tomato is an interesting vegetable crop and numerous genetic studies have been conducted to increase the efficiency of tomato breeding strategies. Yield is an economically important trait and therefore improving yield is the main focus in breeding projects. The selecting efficient breeding strategy needs comprehensive information about the genetic controlling of interested traits. The aim of this study was to determine genetic parameters for yield and yield component tomato through generation mean analysis. Generation mean analysis was conducted using six basic generations (P1, P2, F1, F2, BC1, BC2) derived from a cross between two lines (M110 and P110) of tomato. M110 and P110 have a determinate and indeterminate growth habit respectively. Results showed that a simple additive dominance model was adequate to explain variability among traits of interest. Non-additive gene effects were predominant for all characters in this study. Broad sense heritability was calculated at over 50% for all traits while narrow sense heritability was less than 50%. Therefore, direct selection for these traits might not be useful, and recurrent selection procedures could increase the frequency of favorable alleles in breeding populations to enable the selection and development of genotypes with superior plants.
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