Medical

self-incompatibility

Also found in: Dictionary, Acronyms, Encyclopedia, Wikipedia.

self-incompatibility

a condition in plants where certain types of pollen will not form pollen tubes when deposited on the female stigma, thus preventing fertilization. Self-incompatibility prevents self-fertilization and promotes heterozygosity (the mixing of allelic forms). The system is controlled by an S locus with many alleles (see MULTIPLE ALLELISM), and pollen with the same allele as in the stigma will not germinate to form a pollen tube. This is shown in Fig. 279. Self-incompatibility mechanisms are much used to produce HYBRID plants (e.g. various Brassica crops). See also COMPATIBILITY.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
Mentioned in
References in periodicals archive
In hermaphrodites, self-incompatibility produces differences in fertilization success that are similar in magnitude to among-species crosses, which could result in fairly strong selection pressures against self-fertilization when non-self eggs are available.
Pollen tube growth was not interrupted in the cross-pollination treatment, in contrast to self-pollinated flowers, where pollen tube growth stopped in the stigma or in the style, identifying possible sites of pre-zygotic self-incompatibility.
Macrophylogenetic analyses of the gain and loss of self-incompatibility in the Asteraceae.
dominant self-incompatibility inhibitor (De Jong et al., 1971).
Identification of random amplified polymorphic DNA (RAPD) markers for self-incompatibility alleles in hazelnut.
In flowering plants (also called angiosperms), an intraspecific reproductive mechanism, self-incompatibility (SI), has so far been widely known.
specific goals were to determine: presence of spontaneous self-fertilization (i.e., breakdown of self-incompatibility) in three species, D.
Copyright © 2003-2025 Farlex, Inc Disclaimer
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.