Distant Hybridization

  • P. M. Priyadarshan


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.


Barriers 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 

Further Reading

  1. Baack E et al (2015) The origins of reproductive isolation in plants. New Phytol 207:968–984CrossRefGoogle Scholar
  2. Dempewolf H et al (2017) Past and future use of wild relatives in crop breeding. Crop Sci 57:1070–1082CrossRefGoogle Scholar
  3. Goulet BE et al (2017) Hybridization in plants: old ideas, new techniques. Plant Physiol 173:65–78CrossRefGoogle Scholar
  4. 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
  5. Widmer A (2009) Evolution of reproductive isolation in plants. Heredity 102:31–38CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • P. M. Priyadarshan
    • 1
  1. 1.Erstwhile Deputy DirectorRubber Research Institute of IndiaKottayamIndia

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