Studies On Inheritance Of Earliness Traits, Molecular Markers Of Related Gene And Genetic Diversity Among Cultivated Species In Pepper

Earliness traits are important agronomic characters in pepper, and early maturity is one of the major selection criteria for the cultivars special for protected cultivation. To realize the mechanism of inheritance of earliness traits and understand the genetic diversity among and within cultivated Capsicum species rightly is the basis of genetic improvement in pepper. In this dissertation, the genetic mechanisms of earliness traits, molecular markers of related genes and genetic diversity among and within cultivated Capsicum species in pepper were studied.1 Studies on the genetic mechanisms of earliness traits in pepperWith classic genetics and the major gene plus polygene model of quantitative traits, a joint analysis of multi-generations (P₁, F₁, P₂, B₁, B₂ and F₂) from the cross between an extreme earliness inbred line B₉₄₃₁ and Jiling Changjiao was carried out to investigate the inheritance of the node for first flower in pepper (Capsicum annuum L.). The results showed that the node for first flower in B₉₄₃₁ was controlled by a recessive major gene and the inheritance of the node for first flower fits one major gene plus polygenes model. Heritability values of the major genes of B₁, B₂ and F₂ population were estimated as 83.72%, 76.56% and 86.63% respectively, while those of polygene were 10.96%, 18.58% and 7.94%.In order to investigate inheritance of the node for first flower in pepper (C. annuum) further, a joint analysis of multi-generations (P₁, F₁, P₂, B₁, B₂ and F₂) from the reciprocal crosses between an extreme earliness inbred line B₉₄₃₁ and Jizhuajiao was carried out with the major gene plus polygene model of quantitative traits. The results from analysis...