The Evolution of Dioecy from Distyly: Reevaluation of the Hypothesis of the Loss of Long-Tongued Pollinators

1989 ◽  
Vol 133 (1) ◽  
pp. 149-156 ◽  
Author(s):  
Gayle E. Muenchow ◽  
Marcella Grebus
Keyword(s):  
Evolution Of Dioecy

Evolution of Dioecy in Saurauia (Dilleniaceae)

1984 ◽  
Vol 71 (1) ◽  
pp. 289 ◽  
Author(s):  
W. A. Haber ◽  
K. S. Bawa
Keyword(s):  
Evolution Of Dioecy

scholarly journals Pleiotropic effects of sex-determining genes in the evolution of dioecy in two plant species

2019 ◽  
Vol 286 (1913) ◽  
pp. 20191805 ◽  
Author(s):  
Takashi Akagi ◽  
Deborah Charlesworth
Keyword(s):  
Theoretical Models ◽  
Ancestral State ◽  
Relative Importance ◽  
Sexual Antagonism ◽  
Dioecious Plant ◽  
Dioecious Species ◽  
Dioecious Plants ◽  
Sexual Dimorphisms ◽  
Evolution Of Dioecy ◽  
Plant Sex

One reason for studying sex chromosomes of flowering plants is that they have often evolved separate sexes recently, and the genomes of dioecious species may not yet have evolved adaptations to their changes from the ancestral state. An unstudied question concerns the relative importance of such adaptation, versus the effects of the mutations that led to separate sexes in the first place. Theoretical models for such an evolutionary change make the prediction that the mutations that created males must have sexually antagonistic effects, not only abolishing female functions, but also increasing male functions relative to the ancestral functional hermaphrodites. It is important to test this critical assumption. Moreover, the involvement of sexual antagonism also implies that plant sex-determining genes may directly cause some of the sexual dimorphisms observed in dioecious plants. Sex-determining genes are starting to be uncovered in plants, including species in the genera Diospyros and Actinidia (families Ebenaceae and Actinidiaceae, respectively). Here, we describe transgenic experiments in which the effects of the very different male-determining genes of these two dioecious species were studied in a non-dioecious plant, Nicotiana tabacum . The results indeed support the critical assumption outlined above.

A few more hypotheses for the evolution of dioecy in figs (Ficus, Moraceae)

Oikos ◽  
2003 ◽  
Vol 100 (3) ◽  
pp. 628-635 ◽  
Author(s):  
Rhett D. Harrison ◽  
Norio Yamamura
Keyword(s):  
Evolution Of Dioecy

Y chromosome specific markers and the evolution of dioecy in the genus Silene

Genome ◽  
1998 ◽  
Vol 41 (2) ◽  
pp. 141-147 ◽  
Author(s):  
Y Hi Zhang ◽  
Veronica S Stilio ◽  
Farah Rehman ◽  
Amy Avery ◽  
David Mulcahy ◽  
...  
Keyword(s):  
Y Chromosome ◽  
Sex Chromosomes ◽  
Silene Latifolia ◽  
Dioecious Species ◽  
Sequence Characterized Amplified Region ◽  
Y Chromosomes ◽  
Heteromorphic Sex Chromosomes ◽  
Males And Females ◽  
Genus Silene ◽  
Evolution Of Dioecy

Sex determination in plants has been most thoroughly investigated in Silene latifolia, a dioecious species possessing heteromorphic sex chromosomes. We have identified several new Y chromosome linked RAPD markers and converted these to more reliable sequence characterized amplified region (SCAR) markers by cloning the RAPD fragments and developing longer primers. Of the primer pairs for seven SCARs, five amplify a single, unique fragment from the DNA of male S. latifolia. Two sets of primers also amplify additional fragments common to males and females. Homology between the X and Y chromosomes is sufficient to allow the amplification of fragments from females under less stringent PCR conditions. Five of the SCARs also distinguish between the sexes of closely related dioecious taxa of the section Elisanthe, but not between the sexes of distantly related dioecious species. These markers will be useful for continued investigations into the evolution of sex, phylogenetic relationships among taxa, and population dynamics of sex ratios in the genus Silene.Key words: Melandrium, RAPDs, sex chromosomes, SCARs.

Role of Pollinators in the Evolution of Dioecy from Distyly

Evolution ◽  
1980 ◽  
Vol 34 (6) ◽  
pp. 1138 ◽  
Author(s):  
J. H. Beach ◽  
K. S. Bawa
Keyword(s):  
Evolution Of Dioecy

Sexual specialization and inbreeding avoidance in the evolution of dioecy

1997 ◽  
Vol 63 (1) ◽  
pp. 65-92 ◽  
Author(s):  
D. Carl Freeman ◽  
Jon Lovett Doust ◽  
Ali El-Keblawy ◽  
Kathleen J. Miglia ◽  
E. Durant McArthur
Keyword(s):  
Inbreeding Avoidance ◽  
Sexual Specialization ◽  
Evolution Of Dioecy
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