What is self-incompatibility in angiosperms?
Self-incompatibility is a widespread mechanism in flowering plants that prevents inbreeding and promotes outcrossing. The self-incompatibility response is genetically controlled by one or more multi-allelic loci, and relies on a series of complex cellular interactions between the self-incompatible pollen and pistil.
What is incompatibility and self-incompatibility?
Self-incompatibility is a mechanism that prevents pollen from one flower from fertilizing other flowers of the same plant. Self-incompatibility is often observed in plants belonging to such families as Solanaceae and Rosaceae.
What is self-incompatibility examples?
(Science: plant biology) Inability of pollen grains to fertilize flowers of the same plant or its close relatives. acts as a mechanism to ensure out breeding within some plant species, for example in the case of the s gene complex in brassicas.
How plants distinguish self from non self pollens and prevent self-fertilization?
One such mechanism is gametophytic self-incompatibility, which allows the female reproductive organ, the pistil, to distinguish between self pollen and non-self pollen; self pollen is rejected, whereas non-self pollen is accepted for fertilization.
How does self incompatibility work in an angiosperm?
Angiosperms have developed self-incompatibility (SI) as a genetic system to prevent inbreeding and thus promote outcrossing to generate genetic diversity. SI is based on the self/non-self discrimination between male and female. In many angiosperms, SI is controlled by a single locus, designated S, with multiple haplotypes [ 1 ].
How does the self incompatibility system work in plants?
However, most flowering plants and hermaphroditic animals potentially allow self-fertilization. Approximately 60% of angiosperms possess a self-incompatibility (SI) system to avoid inbreeding. The SI system functions at a process of interaction between pollen (or pollen tube) and the pistil.
How is Si based on self / non-self discrimination?
SI is based on the self/non-self discrimination between male and female. In many angiosperms, SI is controlled by a single locus, designated S, with multiple haplotypes [ 1 ].
Are there self recognition and non self discrimination systems?
Recent studies using genetic, molecular biological and biochemical approaches have revealed that angiosperms utilize diverse self/non-self discrimination systems, which can be classified into two fundamentally different systems, self-recognition and non-self recognition systems.
