Leaky dioecy in Diospyros (Ebenaceae) endemic to the Island of Mauritius

Venkatasamy, Shadila; Khittoo, Govindranathsing; Keeley, Sterling C.

doi:10.1007/s11258-006-9171-y

Cited by 22 publications

(20 citation statements)

References 36 publications

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“…However, considering that two independent crosses using different female parents showed the same tendency of segregation bias, the former reason may be more likely. Significant distortion of the sexuality in Diospyros species other than D. lotus has also been reported, although more male plants than female were observed in the previous report (Venkatasamy et al, 2007).…”

Section: Inheritance Mode Of the Sex Determination Locusmentioning

confidence: 79%

Development of Molecular Markers Associated with Sexuality in Diospyros lotus L. and Their Application in D. kaki Thunb.

Akagi

Kajita

Kibe

et al. 2014

J. Japan. Soc. Hort. Sci.

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Sexuality of crops affects both cultivation and breeding systems. Cultivated persimmon (Diospyros kaki Thunb) has a morphologically well-characterized polygamous or gyonodioecious sexual system. However, the genetic basis of sexuality in D. kaki has yet to be characterized. Here, we used dioecious D. lotus L., a diploid wild relative species to hexaploid or nonaploid D. kaki, as a model to clarify the genetic basis of sexuality in Diospyros and to develop molecular markers associated with the sexuality of individuals. Using 62 F 1 offspring segregated into distinct male/female phenotypes, we found two amplified fragment-length polymorphism markers, DlSx-AF4 and DlSx-AF7, which cosegregated with maleness. This could suggest that the sexuality of D. lotus is controlled by a single gene/haploblock, and the male is dominant over the female. Thus, D. lotus's sexuality can be described as the heterogametic male type, the XY-type, as reported for most other dioecious plant species. For unknown reasons, segregation of the phenotype of a sequence-characterized amplified region marker developed from DlSx-AF4 (DlSx-AF4S) and/or the male/female phenotype in two different crosses in D. lotus showed an apparent bias towards femaleness and better fitted 1:2 than 1:1, which is the theoretical segregation for a single genetic locus or haploblock in diploid D. lotus. DlSx-AF4S could distinguish D. kaki cultivars with female and male flowers from cultivars with only female flowers, strongly indicating that the same genetic system controls D. kaki's sexuality and that DlSx-AF4S could be used as a genetic marker for sexuality in D. kaki breeding programs.

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Section: Inheritance Mode Of the Sex Determination Locusmentioning

confidence: 79%

Development of Molecular Markers Associated with Sexuality in Diospyros lotus L. and Their Application in D. kaki Thunb.

Akagi

Kajita

Kibe

et al. 2014

J. Japan. Soc. Hort. Sci.

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“…A variety of terms have been used to describe these plants or populations. Other than leaky dioecy (Humeau et al 1999, Venkatasamy et al 2007), this type of sexual variant is also known as fruiting male (or sometimes, as fruit‐producing male; McNeilage 1991, Aguirre et al 2007), gender variability (McNeilage 1991), inconstancy (Sarkissian et al 2001), exceptional bisexual individual (Rottenberg 2000), subdioecy (Webb 1999), near‐dioecy (McNeilage 1991), and paradioecy (Standley 1985). Subdioecy and near‐dioecy has been well studied (Lloyd and Bawa 1984, Webb 1999, Dorken and Barrett 2004), and often used to describe the inconstancies occurring in only one sex (usually the male).…”

Section: Discussionmentioning

confidence: 99%

“…Th e genus Eurya has not been well investigated (Min and Bartholomew 2007), thus sexual variants and hermaphroditic fl owers are expected to be found in other Eurya species as well. Some studies have shown that leaky dioecy usually occurs in small, threatened, fragmented populations (Humeau et al 1999, Venkatasamy et al 2007). Our leaky plants were generally found near paths, and had suff ered human disturbance, but it remains unclear whether this disturbance caused the appearance of leaky plants in E. obtusifolia.…”

Section: Bagging Experiments and Fruit Setmentioning

confidence: 99%

Flower structure and sex expression of leaky dioecy in Eurya obtusifolia

Wang¹,

Hongping²,

Ding³

et al. 2013

Nordic Journal of Botany

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Th e genus Eurya is described as strictly dioecious, but rare leaky plants have been found in some species, causing much confusion about the sex expression of the genus. Th rough fi eld investigations from 2009 to 2011, morphologically hermaphroditic fl owers in Eurya obtusifolia were discovered. In order to understand the sex expression of these plants, their stamens, pistils and ovules were carefully observed. Staining methods were used to assess the functional gender. Th e fl owers of the leaky plants can be classifi ed into six types: pistillate, staminate, cryptic pistillate, cryptic staminate, hermaphrodite and infertile. Leaky plants usually exhibit a combination of diff erent kinds of fl owers, making them either gynoecious, androecious, gynomonoecious or monoecious. Some individuals have infertile fl owers. Bagging experiments verifi ed the bisexual function of E. obtusifolia plants, some of which possess the ability to self-pollinate. Th e fl ower morphology of leaky plants varied more than that of dioecious ones, and the number of ovules were signifi cantly negatively correlated with the number of stamens. Th ese plants show lower fi tness than normal dioecious plants. Th is may owe to allocation tradeoff s or sexual genome confl icts. As leaky dioecy is rarely reported in this genus, E. obtusifolia is an important species to study in order to better understand the ecological adaptations and evolutionary pathways that lead to dioecy in Eurya . Our fi ndings provide some evidence that dioecy of Eurya evolved from hermaphroditism, but further studies are still needed.

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“…While monoecious species remain more widely spread than dioecious species (in both island and continental habitats), advantages of outcrossing have been confirmed (Anderson et al 2001;Baker and Cox 1984;Barrett 1996). Anderson et al (2001) also showed that dioecism can have autochthonous origins from a monoecious ancestry, and Venkatasamy et al (2007) suggest that ''leaky dioecy''-in which some self-fertilization is possible in a largely dioecious species-may facilitate establishment after colonization.…”

Section: Group B: Changementioning

confidence: 99%

Carlquist revisited: history, success, and applicability of a natural history model

Midway

Hodge

2011

Biol Philos

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In 1966, island biogeographer Sherwin Carlquist published a list of 24 principles governing long-distance dispersal and evolution on islands. The 24 principles describe many aspects of island biology, from long-distance dispersal and establishment to community change and assemblage. Although this was an active period for island biogeography, other models and research garnered much more attention than did Carlquist's. In this review, over 40 years of support for or against Carlquist's principles is presented. Recent work has supported most of the 24 principles, and improved methodologies have generally substantiated his initial claims. However, Carlquist's original work and ideas remain relatively underrepresented in the biogeographic literature. Use of philosophical model domains provides one explanation as to why Carlquist's work has received little attention. Carlquist's principles are largely natural history tests, and don't translate well into the theoretical, design of preserves, or the experimental domains-whereas other competing models do well in such domains.

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Leaky dioecy in Diospyros (Ebenaceae) endemic to the Island of Mauritius

Cited by 22 publications

References 36 publications

Development of Molecular Markers Associated with Sexuality in Diospyros lotus L. and Their Application in D. kaki Thunb.

Development of Molecular Markers Associated with Sexuality in Diospyros lotus L. and Their Application in D. kaki Thunb.

Flower structure and sex expression of leaky dioecy in Eurya obtusifolia

Carlquist revisited: history, success, and applicability of a natural history model

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