Genetic neighbourhoods in plants with diverse systems of mating and different patterns of growth

Gliddon, C.; Belhassen, E.; Gouyon, Pierre‐Henri

doi:10.1038/hdy.1987.93

Cited by 42 publications

(29 citation statements)

References 15 publications

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“…Gene flow among plant populations is a result of pollen dispersal, seed dispersal and clonal spread (Gliddon et al 1987). For windpollinated species such as O. rufipogon, pollen dispersal is considered as the main form of gene flow (Oka and Morishima 1967).…”

Section: Microsatellite Variation and Population Genetic Structurementioning

confidence: 99%

Comparisons of microsatellite variability and population genetic structure of two endangered wild rice species, Oryza rufipogon and O. officinalis, and their conservation implications

Gao

Zhang

2005

Biodivers Conserv

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Conserving endangered wild rice species requires a thorough understanding of their population genetic structure and appropriate approaches. We applied six and seven microsatellite loci to study the genetic structure of six populations throughout the range of Chinese Oryza rufipogon and Oryza officinalis, respectively. The results showed that O. rufipogon possesses higher levels of genetic diversity but lower differentiation (R S ¼ 3.2713, P ¼ 100.0%,Mean population F IS was slightly larger for O. officinalis (F IS ¼ 0.844) than that for O. rufipogon (F IS ¼ 0.755), indicating that O. officinalis has slightly higher departures from Hardy-Weinberg expectations and heterozygosity deficits than O. rufipogon. In addition to different origins and evolutionary histories, O. officinalis has restricted gene flow, high inbreeding, isolated small populations and fewer opportunities of hybridization with other taxa, which may determine major differences in population genetic structure from O. rufipogon. Our results suggest the adoption of a plan of involving fewer populations but more individuals within populations for O. rufipogon, while both the number of populations and the individuals for a sampled population should be almost equally considered for O. officinalis. The known high degree of inbreeding in the populations of both species implies that conservation and restoration genetics should particularly focus on the maintenance of historically significant processes such as high levels of outbreeding, gene flow and large effective population sizes. We finally proposed to further estimate the role of rice gene flow in the conservation of O. rufipogon, and to perform detailed analysis of mating systems in both species for better conservation perspectives of their ecological and evolutionary processes.

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Section: Microsatellite Variation and Population Genetic Structurementioning

confidence: 99%

Comparisons of microsatellite variability and population genetic structure of two endangered wild rice species, Oryza rufipogon and O. officinalis, and their conservation implications

Gao

Zhang

2005

Biodivers Conserv

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“…Couvet et at., 1986;Gliddon et al, 1987;Beihassen et at., 1989Beihassen et at., , 1990. The involvement of cytoplasmic genes in the determination of male-sterility in Thymus vulgaris has been demonstrated (Bethassen et at., 1991).…”

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confidence: 99%

Mitochondrial genome of Thymus vulgaris L. (Labiate) is highly polymorphic between and among natural populations

et al. 1993

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“…It appears that, despite its widespread occurrence, many of the population genetical consequencies of vegetative reproduction are only recently beginning to be seriously explored (e.g., Ellstrand and Roose, 1987;Gliddon, Belhassen and Gouyon, 1987). Possibly one reason for this is the insistence of the influential population ecologist Harper (1977, pp.…”

Section: Discussionmentioning

confidence: 99%

The evolution and maintenance of gynodioecy in sexually and vegetatively reproducing plants

Stevens

Damme

1988

Heredity

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The evolution and maintenance of gynodioecy is explored theoretically at the ramet level in models that allow for differences between females and hermaphrodites in vegetative components of fitness as well as in sexual components.For nuclear control of male sterility, it is shown that females may be maintained by selection in an otherwise hermaphrodite population through advantages over hermaphrodites in vegetative fitness components, even if there is no sex difference in maternal fitness components. The advantage required depends on the importance of vegetative reproduction. If females produce more daughter ramets than ovule offspring, the advantage in vegetative fitness components required to maintain females is numerically smaller than the well-known requirement of a two-fold advantage in maternal fitness components.Three further findings in the nuclear models are that (a) with some parameter combinations, females attain frequencies of higher than O•5, in which case their equilibrium frequency decreases rather than increases with increasing female advantage in seed fecundity; (b) the advantage in adult survivability required to maintain a given equilibrium frequency of females becomes smaller with increasing reliance on vegetative reproduction; and (c) the rate of approach to equilibrium is inversely proportional to the level of vegetative reproduction in the population as a whole.If male sterility is determined solely by cytoplasmic factors, females should be maintained if they have any advantage in vegetative reproduction over hermaphrodites, given that maternal fitness components are equal in the two sexes.For nuclear-cytoplasmic control, it is shown that the premise that a joint polymorphism for cytoplasmic male sterility and nuclear fertility restoration should not be maintained in the absence of differences in fitness between sex genotypes of the same sex phenotype (Charlesworth and Ganders, 1979) may be generalised to situations where sex differences in vegetative reproduction occur.The significance of vegetative reproduction in population genetic studies in general is briefly discussed.

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Genetic neighbourhoods in plants with diverse systems of mating and different patterns of growth

Cited by 42 publications

References 15 publications

Comparisons of microsatellite variability and population genetic structure of two endangered wild rice species, Oryza rufipogon and O. officinalis, and their conservation implications

Comparisons of microsatellite variability and population genetic structure of two endangered wild rice species, Oryza rufipogon and O. officinalis, and their conservation implications

Mitochondrial genome of Thymus vulgaris L. (Labiate) is highly polymorphic between and among natural populations

The evolution and maintenance of gynodioecy in sexually and vegetatively reproducing plants

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