Distant or wide hybridization is the mating between individuals of different species or genera that combines diverged genomes into one nucleus. This process breaks the species barrier for gene transfer. It enables transfer of whole genome of one species to another, thus inflicting changes in genotypes and phenotypes of the progenies. Many of the day-to-day crop plants are the result of natural distant hybridization and speciation. The origin of many allopolyploid species is through chromosome doubling of wide hybrids. Repeated backcrossing of wide hybrids to their parents is yet another way of gene introgression. This happens through infiltration of chromosomes or chromosome fragments from one species to another.
KeywordsBarriers in production of distant hybrids Pre-zygotic incompatibility Post-zygotic incompatibility Failure of zygote formation and development Embryonic incompatibility and embryo rescue Transgressive segregation Nuclear-cytoplasmic interactions
- Liu D et al (2014) Distant hybridization: a tool for interspecific manipulation of chromosomes. In: Pratap A, Kumar J (eds) Alien gene transfer in crop plants, volume 1: innovations, methods and risk assessment. Springer, New YorkGoogle Scholar