Functional androdioecy in the flowering plant Datisca glomerata

Liston, Aaron; Rieseberg, Loren H.; Elias, Thomas S.

doi:10.1038/343641a0

Cited by 115 publications

(83 citation statements)

References 20 publications

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“…As yet, there is no information about the mode of sex inheritance in the other known androdioecious plant species, Datisca glomerata (Liston et al, 1990;Fritsch & Rieseberg, 1992), Phillyrea angustifolia (Lepart & Dommée, 1992;Traveset, 1994) and P latifolia (Aronne & Wilcock, 1994). However, the genetic system for sex determination in the notostracan Eulimnadia texana is well characterized (Sassaman, 1989(Sassaman, , 1991Otto et a!., 1993;Sassaman & Weeks, 1993) and contrasts with that in M annua described here.…”

Section: Discussionmentioning

confidence: 62%

“…(Charlesworth, 1984;Liston et a!., 1990;Fritsch & Rieseberg, 1992), and theoretical studies have shown that it is unlikely to be maintained in nature. One reason for this is that males can only coexist with cosexes if they are more than twice as fertile as the cosex male function, a fertility threshold which increases in partially selfing populations (Lloyd, 1975;Charlesworth & Charlesworth, 1978).…”

Section: Environmental Sex Determinationmentioning

confidence: 99%

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Mixed genetic and environmental sex determination in an androdioecious population of Mercurialis annua

Pannell

1997

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Mercurialis annua is a ruderal of pan-European distribution. In southern Spain, southern Portugal and northern Morocco, males coexist with monoecious (cosex) individuals at frequencies which vary between zero and about 30 per cent. Here, I report the results of two glasshouse experiments which aimed to characterize the mode of sex determination in one such androdioecious population. In a breeding experiment, cosexes isolated from males produced only cosexual progeny, whereas those allowed to mate with males produced both cosexual and male offspring. The results are consistent with a single-locus model of sex inheritance, with maleness determined by a dominant allele. In a density experiment, the frequency of males correlated positively with density, confirming field observations. Differential mortality or germination between the sexes was excluded by experimental design, so that the result supports the hypothesis of density-dependent gender choice. A negative correlation between density and the proportion of 'late cosexes' (males which turned cosexual late in their development), and the lack of any differences in the proportion of pure (unchanged) cosexes between density, suggest that only males were capable of sex change. This interpretation is consistent with the results of the breeding experiment, in which late cosexes occurred only in the offspring of cosexes allowed to mate with males. I argue that these findings help to explain the maintenance of androdioecy in M annua.keyworcis: androdloecy, dioecy, reproductive dimorphism.

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Section: Discussionmentioning

confidence: 62%

Section: Environmental Sex Determinationmentioning

confidence: 99%

Mixed genetic and environmental sex determination in an androdioecious population of Mercurialis annua

Pannell

1997

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“…In these species, cosexuals and males coexist and siring success of pollen from cosexuals has been demonstrated after experimental pollinations. In Datisca glomerata (Datiscaceae), a wind-pollinated perennial herb, hermaphrodites significantly outnumber males and bear fewer stamens than males (Liston et al, 1990), and are selfcompatible but suffer inbreeding depression (Rieseberg et al, 1993). In Phillyrea angustifolia (Oleaceae), a wind-pollinated shrub, the ratio of males to hermaphrodites is approx.…”

Section: mentioning

confidence: 99%

“…In D. glomerata (Liston et al, 1990 ;Rieseberg et al, 1992), androdioecy seems to be derived from dioecy. In the genus Fraxinus, approx.…”

Section: mentioning

confidence: 99%

Androdioecy in the entomophilous tree Fraxinus ornus (Oleaceae)

et al. 1999

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Androdioecy (the coexistence of two genders, cosexuals and males, in a single population) is a rare breeding system. In terms of functional gamete production, androdioecy has been reported in a small number of windpollinated and insect-pollinated species. In this study we examine the floral biology, stability of gender, and fruit and seed production after self-pollination and outcrossing pollination in a potentially androdioecious tree, Fraxinus ornus, in southern France. Individual trees have either hermaphrodite flowers or male flowers, the latter lacking a well-developed gynoecium. The two genders produce morphologically similar pollen and were present in 1 : 1 or slightly male-biased ratios. Only hermaphrodites set fruit during 2-4 yr of observation at four different sites in southern France. Experimental pollinations of eight trees in two different sites showed that hermaphrodites produce viable pollen in dehiscent anthers and viable seeds. Thus, in terms of functional gamete production, F. ornus is a new case of functional androdioecy. Seven hermaphrodites were self-compatible, and such self-compatibility of hermaphrodites might improve the colonizing ability of F. ornus in a region where this species is actively expanding its range.

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“…A metapopulation dynamics model also predicts that self-incompatible populations maintain a higher frequency of male plants than do self-compatible populations (Pannell, 1997a). Because all androdioecious species show variations in male frequency between populations (eg, Liston et al, 1990;Pannell, 1997b;Akimoto et al, 1999), and self-compatibility, except for Phillyrea angustifolia (Vassiliadis et al, 2000b), studies of the relationship between the magnitude of inbreeding and male frequency provide a way to test these theoretical predictions.…”

Section: Introductionmentioning

confidence: 99%

Mating system and population genetic structure of an androdioecious tree, Fraxinus lanuginosa Koidz. (Oleaceae) in northern Japan

Ishida

Hiura

2002

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Models for the maintenance of androdioecy have suggested that selfing of hermaphrodites decreases the frequency of males in a population (the 'male frequency'). To test this hypothesis, we used electrophoretic allozyme methods to study the mating system and population genetics of an androdioecious tree, Fraxinus lanuginosa, which exhibits large variations in male frequency among subpopulations in central Hokkaido (northern Japan). We estimated the outcrossing rates by using seeds assayed at three polymorphic loci, and found that the multilocus outcrossing rate (t m ) increased with increasing male frequency (q) (t m = 0.69 to 0.99, q = 0.11 to 0.59). Fixation indices (F j ) estimated from these t m values ranged from 0.006 to 0.185, and were significantly greater than zero in plots with a low male frequency (q Յ 0.35), but not in plots with intermediate or high male frequencies (q Ն 0.47). However, fixation indices at the late

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Functional androdioecy in the flowering plant Datisca glomerata

Cited by 115 publications

References 20 publications

Mixed genetic and environmental sex determination in an androdioecious population of Mercurialis annua

Mixed genetic and environmental sex determination in an androdioecious population of Mercurialis annua

Androdioecy in the entomophilous tree Fraxinus ornus (Oleaceae)

Mating system and population genetic structure of an androdioecious tree, Fraxinus lanuginosa Koidz. (Oleaceae) in northern Japan

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