Pollen Performance and Sex-Ratio Evolution in a Dioecious Plant

Taylor, Douglas R.; Saur, Meaghan J.; Adams, Erika M.

doi:10.2307/2640808

Cited by 32 publications

(39 citation statements)

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“…Males that are heterozygous for a meiotic drive allele typically produce fewer functional sperm or pollen than do homozygous normal males. Thus, the transmission advantage is diminished when competition among the gametes or gametophytes of different males is intense (12,55). There are astonishing parallels between plants and animals with regard to polyandry as a defense against fertilization by drive allele-carrying sperm [e.g., (56)] and pollen (55).…”

Section: Female Control Of Paternitymentioning

confidence: 99%

Evolutionary Ecology of the Prezygotic Stage

Bernasconi

Ashman

Birkhead

et al. 2004

Science

150

163

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The life cycles of sexually reproducing animals and flowering plants begin with male and female gametes and their fusion to form a zygote. Selection at this earliest stage is crucial for offspring quality and raises similar evolutionary issues, yet zoology and botany use dissimilar approaches. There are striking parallels in the role of prezygotic competition for sexual selection on males, cryptic female choice, sexual conflict, and against selfish genetic elements and genetic incompatibility. In both groups, understanding the evolution of sex-specific and reproductive traits will require an appreciation of the effects of prezygotic competition on fitness.

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Section: Female Control Of Paternitymentioning

confidence: 99%

Evolutionary Ecology of the Prezygotic Stage

Bernasconi

Ashman

Birkhead

et al. 2004

Science

150

163

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“…Wilkinson & Fry 2001) but also in plants. Taylor et al (1999) analyzed the outcome of pollen competition between males that produced different sex ratios in the white campion (Silene alba), a dioecious plant with XY-sex determination. They estimated how the sex-ratio bias influenced the transmission properties of the sex chromosomes, using a combination of singlemale pollinations and pollen mixtures to evaluate the effects of multiple paternity.…”

Section: Pollen Competition and Sex Ratio Distortionmentioning

confidence: 99%

Seed paternity in flowering plants: an evolutionary perspective

Bernasconi

2003

Perspectives in Plant Ecology, Evolution and Systematics

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the male function. Also, paternity can be the end result of competition for fertilization among pollen from one or several donors, selection processes occurring between pollen deposition and fertilization, and post-zygotic events such as seed abortion.Pre-zygotic competition and selection processes in flowering plants are relevant under several aspects (e.g. Snow & Lewis 1993;Delph & Havens 1998 AbstractThe ultimate importance of paternal contributions to fitness and of post-pollination selection in flowering plants have remained elusive, largely because of the technical difficulty of assigning paternity. I review empirical studies that use heritable markers to investigate per-fruit seed paternity in natural populations and after experimental multiple-donor pollination. Thirty-one studies covering 23 species from 16 plant families document that in natural populations seeds from a single fruit are often fathered by multiple pollen donors (5 species from 5 families), that donors can differ significantly in seed-siring success (8 species from 6 families), that variation in pollen tube growth rates can be heritable (n = 1 out of 4 studies), that donor and recipient genotypes can simultaneously affect paternity (n = 2), and that temporal order of pollen deposition (n = 1) and environmental effects (n = 2) affect the outcome of pollen competition. These studies also investigate the role of post-pollination selection in the avoidance of inbreeding and for species boundaries. Most studies of male reproductive success in plants to date base on isozyme electrophoresis. The availability in the last decade of highly polymorphic molecular markers such as microsatellite DNA has been expected to open new possibilities to investigate competition and selection during the gametophytic phase. Yet, to date, there is still need for greater data wealth on seed paternity to test theories of sex allocation and to gain deeper understanding of floral trait evolution and of the evolutionary consequences of post-pollination selection in flowering plants.

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“…This follows from the interaction between effects of maternal and paternal parent. It also follows from certation studies, (15) in which interactions were observed between maternal tissue and X-or Y-bearing pollen, which affected pollen germination, pollen tube growth and embryo maturation. Certation is the dependence of sex ratio of the seeds on pollination intensity; the fraction of sons is lower with abundant pollination than with sparse pollination.…”

Section: Evidence For Conflict Over Sex Determinationmentioning

confidence: 99%

“…Seed sex ratio of different mothers is on average 0.41 and varies between 0.05 and 0.75. (15) This large variation in sex ratio may reflect different degrees of control of parents and offspring.…”

Section: Evidence For Conflict Over Sex Determinationmentioning

confidence: 99%

Why girls want to be boys

2001

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The mechanisms by which sex is genetically determined are bewilderingly diverse and appear to change rapidly during evolution.(1) What makes the sex‐determining process so prone to perturbations? Two recent articles(2,3) explore theoretically the role of genetic conflict in sex determination evolution. Both studies use the idea that selection on sex‐determining genes may act differently in parents and in offspring and they suggest that the resulting conflict can drive changes in sex‐determining mechanisms. BioEssays 23:477–480, 2001. © 2001 John Wiley & Sons, Inc.

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Pollen Performance and Sex-Ratio Evolution in a Dioecious Plant

Cited by 32 publications

References 0 publications

Evolutionary Ecology of the Prezygotic Stage

Evolutionary Ecology of the Prezygotic Stage

Seed paternity in flowering plants: an evolutionary perspective

Why girls want to be boys

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