Development of mutants and their effective utilization to incorporate desirable traits in tomato would be a sound improvement strategy to develop so called ‘smart’ tomato variety of the coming century. Initially we developed three induced mutants from two varieties, ‘Patharkuchi’, a local adapted cultivar and an introduced variety ‘Berika’, and then three crosses (Berika × P Mut-5, Berika × P Mut-11, Patharkuchi × B Mut-1) were made to involve in these two varieties and their respective mutants. Six generations (P1, P2, F1, F2, BC1 and BC2) of three crosses were utilized to study the genetic control of yield and quality traits, and to study the genetic basis of formation of dark green fruit. The nature and magnitude of gene action controlling the inheritance of 27 quantitative traits differed from one cross to another and from one trait to another, mostly conditioned by nonadditive gene action and duplicate epistasis. The prevalence of duplicate epistasis in three crosses for most of the traits revealed that the pace of progress through conventional selection process would be hindered as this kind of epistasis might result in decreased variation in F2 and subsequent generations. Recurrent selection in biparental progenies would be helpful for exploiting this type of nonallelic interaction through generation of high frequency of desirable recombination and concentration of genes having cumulative effects in the population. We also observed complex genetic behaviour of some of the traits revealing significant epistatic components. Inheritance study of ‘dark green fruit’ (dg1) of Berika × P Mut-5 cross revealed a single recessive gene governing the trait and expressed when the mutant gene was in homozygous recessive condition (designated as dg-1/dg-1).

中文翻译：

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番茄（Solanum lycopersicum L.）品种和诱导突变体杂交中生殖和果实品质性状的遗传控制

突变体的开发及其有效利用以在番茄中加入所需特性将是开发下个世纪所谓的“智能”番茄品种的合理改进策略。最初，我们从两个品种“Patharkuchi”、一个本地适应品种和一个引入品种“Berika”中开发了三个诱导突变体，然后进行了三个杂交（Berika × P Mut-5、Berika × P Mut-11、Patharkuchi × B Mut- 1) 涉及这两个品种及其各自的突变体。利用3个杂交的6代（P1、P2、F1、F2、BC1和BC2）研究产量和品质性状的遗传控制，研究深绿色果实形成的遗传基础。控制 27 个数量性状遗传的基因作用的性质和大小在一个杂交与另一个杂交以及一个性状与另一个性状之间不同，主要受非加性基因作用和重复上位性的制约。大多数性状在三个杂交中重复上位的普遍性表明，通过常规选择过程的进展速度将受到阻碍，因为这种上位可能导致 F2 和后续世代的变异减少。双亲后代中的循环选择将有助于通过产生高频率的理想重组和在种群中具有累积效应的基因浓度来利用这种类型的非等位基因相互作用。我们还观察到一些特征的复杂遗传行为，揭示了重要的上位成分。