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Dioecy

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Not to be confused withDioicy.

Dioecy(/daɪˈiːsi/dy-EE-see;[1]fromAncient Greekδιοικίαdioikía'two households'; adj.dioecious,/daɪˈiːʃ(i)əs/dy-EE-sh(ee-)əs[2][3]) is a characteristic of certainspeciesthat have distinct unisexual individuals, each producing either male or femalegametes,either directly (inanimals) or indirectly (inseed plants).Dioecious reproductionis biparental reproduction. Dioecy has costs, since only the female part of the population directly produces offspring. It is one method for excludingself-fertilizationand promotingallogamy(outcrossing), and thus tends to reduce the expression of recessive deleterious mutations present in a population.Plantshave several other methods of preventing self-fertilization including, for example,dichogamy,herkogamy,andself-incompatibility.

In zoology[edit]

Physalia physalis,Portuguese man o' war,is a dioecious colonial marine animal; the reproductive medusae within the colony are all of the same sex.[4]
Further information:Gonochorism

In zoology, dioecy means that an animal is either male or female, in which case the synonymgonochoryis more often used.[5][page needed]For example, mostanimalspecies are gonochoric, almost all vertebrate species are gonochoric, and all bird and mammal species are gonochoric.[6]Dioecy may also describe colonies within a species, such as the colonies ofSiphonophorae(Portuguese man-of-war), which may be either dioecious ormonoecious.[7]

In botany[edit]

Land plants (embryophytes) differ from animals in that theirlife cycleinvolvesalternation of generations.In animals, typically an individual producesgametesof one kind, eitherspermoregg cells.The gametes have half the number ofchromosomesof the individual producing them, so arehaploid.Without further dividing, a sperm and an egg cell fuse to form azygotethat develops into a new individual. In land plants, by contrast, one generation – thesporophytegeneration – consists of individuals that produce haploidsporesrather than haploidgametes.Spores do not fuse, butgerminateby dividing repeatedly bymitosisto give rise to haploidmulticellularindividuals, thegametophytes,which produce gametes. A male gamete and a female gamete then fuse to produce a newdiploidsporophyte.[8]

Alternation of generations in plants: the sporophyte generation produces spores that give rise to the gametophyte generation, which produces gametes that fuse to give rise to a new sporophyte generation.

In bryophytes (mosses,liverwortsandhornworts), the gametophytes are fully independent plants.[9]Seed plant gametophytes are dependent on the sporophyte and develop within the spores, a condition known asendospory.In flowering plants, the male gametophytes develop withinpollengrains produced by the sporophyte'sstamens,and the female gametophytes develop withinovulesproduced by the sporophyte'scarpels.[8]

The sporophyte generation of a seed plant is called "monoecious"when each sporophyte plant has both kinds of spore-producing organ but in separate flowers or cones. For example, a singleflowering plantof a monoecious species has both functional stamens and carpels, in separate flowers.[10]

The sporophyte generation of seed plants is called "dioecious"when each sporophyte plant has only one kind of spore-producing organ, all of whose spores give rise either to male gametophytes, which produce only male gametes (sperm), or to female gametophytes, which produce only female gametes (egg cells). For example, a single flowering plant sporophyte of a fully dioecious species likehollyhas either flowers with functional stamens producing pollen containing male gametes (staminate or 'male' flowers), or flowers with functional carpels producing female gametes (carpellate or 'female' flowers), but not both.[10][11](SeePlant reproductive morphologyfor further details, including more complex cases, such asgynodioecyandandrodioecy.)

  • In dioecious holly, some plants only have 'male' flowers with functional stamens that produce pollen...
    In dioecious holly, some plants only have 'male' flowers with functional stamens that produce pollen...
  • ...while other holly plants only have 'female' flowers that produce ovules
    ...while other holly plants only have 'female' flowers that produce ovules
  • By comparson, each bisexual (perfect) tulip flower has both pollen-producing stamens and carpels containing ovules.
    By comparson, each bisexual (perfect) tulip flower has both pollen-producing stamens and carpels containing ovules.

Slightly different terms,dioicousandmonoicous,may be used for thegametophytegeneration of non-vascular plants, althoughdioeciousandmonoeciousare also used.[12][13]A dioicous gametophyte either produces only male gametes (sperm) or produces only female gametes (egg cells). About 60% of liverworts are dioicous.[14]: 52 

Dioecy occurs in a wide variety of plant groups. Examples of dioecious plant species includeginkgos,willows,cannabisandAfrican teak.As its specific name implies, the perennial stinging nettleUrtica dioicais dioecious,[15]: 305 while the annual nettleUrtica urensis monoecious.[15]: 305 Dioeciousfloraare predominant intropicalenvironments.[16]

About 65% ofgymnospermspecies are dioecious,[17]but almost all conifers are monoecious.[18] In gymnosperms, the sexual systems dioecy and monoecy are strongly correlated with the mode of pollen dispersal, monoecious species are predominantly wind dispersed (anemophily) and dioecious species animal-dispersed (zoophily).[19]

About 6 percent offlowering plantspecies are entirely dioecious and about 7% of angiospermgeneracontain some dioecious species.[20]Dioecy is more common inwoody plants,[21]andheterotrophicspecies.[22]In most dioecious plants, whether male or female gametophytes are produced is determined genetically, but in some cases it can be determined by the environment, as inArisaemaspecies.[23]

Certainalgae,such as some species ofPolysiphonia,are dioecious.[24]Dioecy is prevalent in the brown algae (Phaeophyceae) and may have been the ancestral state in that group.[25]

Evolution of dioecy[edit]

For evolution in animals, seeGonochorism § Evolution.

In plants, dioecy hasevolved independentlymultiple times[26]either from hermaphroditic species or from monoecious species. A previously untested hypothesis is that this reduces inbreeding;[27]dioecy has been shown to be associated with increasedgenetic diversityand greater protection against deleterious mutations.[28]Regardless of the evolutionary pathway the intermediate states need to have fitness advantages compared to cosexual flowers in order to survive.[29]

Dioecy evolves due to male or female sterility,[30]although it is unlikely that mutations for male and female sterility occurred at the same time.[31]In angiosperms unisexual flowers evolve from bisexual ones.[32]Dioecy occurs in almost half of plant families, but only in a minority of genera, suggesting recent evolution.[33]For 160 families that have dioecious species, dioecy is thought to have evolved more than 100 times.[34]

In the familyCaricaceae,dioecy is likely the ancestral sexual system.[35]

From monoecy[edit]

Dioecious flowering plants can evolve frommonoeciousancestors that have flowers containing both functional stamens and functional carpels.[36]Some authors argue monoecy and dioecy are related.[37]

In the genusSagittaria,since there is a distribution of sexual systems, it has been postulated that dioecy evolved from monoecy[38]throughgynodioecymainly from mutations that resulted in male sterility.[39]: 478 However, since the ancestral state is unclear, more work is needed to clarify the evolution of dioecy via monoecy.[39]: 478 

From hermaphroditism[edit]

Dioecy usually evolves fromhermaphroditismthroughgynodioecybut may also evolve throughandrodioecy,[40]throughdistyly[41]or throughheterostyly.[28]In theAsteraceae,dioecy may haveevolved independentlyfrom hermaphroditism at least 5 or 9 times. The reverse transition, from dioecy back to hermaphroditism has also been observed, both in Asteraceae and in bryophytes, with a frequency about half of that for the forward transition.[42]

InSilene,since there is no monoecy, it is suggested that dioecy evolved through gynodioecy.[43]

In mycology[edit]

Very few dioecious fungi have been discovered.[44]

Monoecy and dioecy infungirefer to the donor and recipient roles in mating, where a nucleus is transferred from one haploid hypha to another, and the two nuclei then present in the same cell merge bykaryogamyto form azygote.[45]The definition avoids reference to male and female reproductive structures, which are rare in fungi.[45]An individual of a dioecious fungal species not only requires a partner for mating, but performs only one of the roles in nuclear transfer, as either the donor or the recipient. A monoecious fungal species can perform both roles, but may not be self-compatible.[45]

Adaptive benefit[edit]

Dioecy has the demographic disadvantage compared with hermaphroditism that only about half of reproductive adults are able to produce offspring. Dioecious species must therefore have fitness advantages to compensate for this cost through increased survival, growth, or reproduction. Dioecy excludesself-fertilizationand promotesallogamy(outcrossing), and thus tends to reduce the expression of recessive deleterious mutations present in a population.[46]In trees, compensation is realized mainly through increased seed production by females. This in turn is facilitated by a lower contribution of reproduction to population growth, which results in no demonstrable net costs of having males in the population compared to being hermaphroditic.[47]Dioecy may also accelerate or retard lineage diversification inangiosperms.Dioecious lineages are more diversified in certain genera, but less in others. An analysis suggested that dioecy neither consistently places a strong brake on diversification, nor strongly drives it.[48]

See also[edit]

References[edit]

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Bibliography[edit]

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