Читать книгу Principles of Plant Genetics and Breeding - George Acquaah - Страница 265

One of the principal techniques of plant breeding is artificial mating (crossing) of selected parents to produce new individuals that combine the desirable characteristics of the parents. This technology is restricted to sexually reproducing species that are compatible. However, in the quest for new desirable genes, plant breeders sometimes attempt to mate individuals that are biologically distantly related. In such interspecific crosses pre‐ and post‐fertilization barriers may occur. It is important for the breeder to understand the problems associated with making a cross, and how barriers to crossing, where they exist, can be overcome. After studying this chapter, the student should be able to:

1 Define sexual hybridization and discuss its genetic consequences.

2 Define a wide cross and discuss its objectives and consequences.

3 Discuss the challenges to wide crosses and techniques for overcoming them.