Allogamy
Allogamy or cross-fertilization is the
In plants, allogamy is used specifically to mean the use of pollen from one plant to fertilize the flower of another plant and usually synonymous with the term "cross-fertilization" or "cross-pollination" (outcrossing).[4] The latter term can be used more specifically to mean pollen exchange between different plant strains or even different plant species (where the term cross-hybridization can be used) rather than simply between different individuals.[6]
Avoidance of inbreeding depression
Allogamy ordinarily involves cross-fertilization between unrelated individuals leading to the masking of deleterious recessive alleles in progeny.[8][9] By contrast, close inbreeding, including self-fertilization in plants and automictic parthenogenesis in hymenoptera, tends to lead to the harmful expression of deleterious recessive alleles (inbreeding depression).[10]
In dioecious plants, the stigma may receive pollen from several different potential donors. As multiple pollen tubes from the different donors grow through the stigma to reach the ovary, the receiving maternal plant may carry out pollen selection favoring pollen from less related donor plants.[11] Thus post-pollination selection may occur in order to promote allogamy and avoid inbreeding depression. Also, seeds may be aborted selectively depending on donor–recipient relatedness.[11]
See also
- Heterosis
- Outcrossing
- Self-incompatibility in plants
References
- ^ ISBN 978-0-19-871437-8, retrieved 2022-03-16
- ^ "cross-fertilization". www.britannica.com. Encyclopaedia Britannica. Retrieved 2022-03-16.
- PMID 28564176.
- ^ S2CID 85344103.
- ISBN 978-3-642-58301-8, retrieved 2022-03-16
- JSTOR 2269516.
- JSTOR 2425946.
- PMID 3324702.
- ISBN 978-0201442328
- S2CID 1461571.
- ^ PMID 18698334.
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