self-incompatibility


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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.
References in periodicals archive ?
Macrophylogenetic analyses of the gain and loss of self-incompatibility in the Asteraceae.
dominant self-incompatibility inhibitor (De Jong et al.
Identification of random amplified polymorphic DNA (RAPD) markers for self-incompatibility alleles in hazelnut.
Allele-specific receptor-ligand interactions in Brassica self-incompatibility.
Partial self-incompatibility in the polyploid endemic species Scalesia affinis (Asteraceae) from the Galapagos: remnants of a self-incompatibility system?
Canela-Ferreira and Sazima (2003) reported self-incompatibility for Aechmea pectinata Baker, a hermaphroditic homogamic species, inhabitant of the rainforests in southeastern Brazil.
Sexual reproduction within Lakeside daisy involves a strong sporophytic, self-incompatibility system.
2001) and contains both diploid (2n = 2x = 16) and tetraploid (2n = 4x = 32) forms, with two breeding systems, self-incompatibility and self-compatibility.
This cryptic self-incompatibility may effectively reduce geitonogamous self-fertilization, because stigmas probably receive outcross and geitonogamous pollen simultaneously.