Trioecy is also called tridioecy and subdioecy.[4]
The term trioecy comes from the Neo-Latin word Trioecia, a former order of trioecious plants.[5]
Evolution of trioecy
Trioecy may be an unstable transient state[6] associated with evolutionary transitioning from gynodioecy to dioecy.[7][6] In brachiopod species, trioecy usually breaks into androdioecy or gynodioecy.[8] Other studies show that trioecious populations originated from gonochoristic ancestors which were invaded by a mutant selfing hermaphrodite, creating a trioecious population.[1] It has been suggested that chromosomal duplication plays an important part in the evolution of trioecy.[9]
But one study found that trioecy can be stable under nucleocytoplasmic sex determination.[10] Another theoretical analysis indicates that trioecy could be evolutionary stable in plant species if a large amount of pollinators vary geographically.[11]
Occurrence
Trioecy is a relatively common sexual system in plants,[12] estimated to occur in about 3.6% of flowering plant species,[10] although most reports of trioecy could be misinterpretations of gynodioecy.[13] It is rare as well as poorly understood in animals.[12]
Species that exhibit trioecy
The following species have been observed to exhibit a trioecious breeding system.
↑Joseph KS, Murthy HN (2015). "Sexual system of Garcinia indica Choisy: geographic variation in trioecy and sexual dimorphism in floral traits". Plant Systematics and Evolution. 301 (3): 1065–1071. Bibcode:2015PSyEv.301.1065J. doi:10.1007/s00606-014-1120-y. S2CID15926083.
↑Husaini, Amjad M.; Neri, Davide (2016). Strawberry: growth, development and diseases. Boston, MA: CAB International.
↑Fleming, Theodore H. (September 2000). "Pollination of Cacti in the Sonoran Desert: When closely related species vie for scarce resources, necessity is the mother of some pretty unusual evolutionary inventions". American Scientist. 88 (5): 432–439. doi:10.1511/2000.5.432. JSTOR27858091. S2CID122244912.
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