In this article we will discuss about:- 1. Manifestation of Heterosis 2. Genetic Basis of Heterosis 3. Applications. Manifestation of Heterosis: Performance or expression of any character or trait is influenced by many genetic factors — some are positive (stimulating) and others are negative (decreasing). Expressivity of the genes or the degree of manifestation of a character is the result [...]
For selection of a new variety from a segregating population after hybridization the methods followed in self-pollinated crop are of three types: 1. Pedigree method, 2. Bulk method, 3. Back cross method. Method # 1. Pedigree Method: Individual plant progeny is selected from F2 and subsequent generations, and their progenies are tested. During this process the record of parents as [...]
The following points highlight the four main steps of hybrid seed production. The steps are: 1. Choice and Development of Seed Parent (A-Line) 2. Choice and Development of Restorer or Male Parent (R-Line) 3. Maintenance and Multiplication of Parental Seeds 4. Production and Improvement of F1 Hybrids. Step # 1. Choice and Development of Seed Parent (A-Line): The seed parent [...]