Complex determination of male sterility in Thymus vulgaris L.: genetic and molecular analysis

Belhassen, E.; Dommée, Bertrand; Atlan, Anne; Gouyon, Pierre‐Henri; Pomente, D.; Assouad, M. W.; Couvet, Denis

doi:10.1007/bf00226204

Cited by 76 publications

(68 citation statements)

References 38 publications

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“…This is in agreement with the model of Frank (1989), and does not violate the model of Gouyon et al (1991). Frank (1989) used nine CMS types in the model, but the lower limit of the number of CMS types necessary for maintenance is unknown.…”

Section: Data and Theorysupporting

confidence: 82%

“…Gene frequencies: CMS type and restorer alleles Changes in sex phenotype composition within populations have been predicted by two theoretical models: those posited by Frank (1989) and Gouyon et al (1991). The number of CMS types and their distribution over populations are important factors for distinguishing between the two models.…”

Section: Dynamics Of Gynodioecymentioning

confidence: 99%

“…Recombination between small and large repeats can give rise to rearrangements (Lonsdale et al, 1988). A high degree mitochondrial variation has been found in most natural populations of gynodioecious species (Belhassen et al, 1991;Cuguen et a!., 1994;Ronfort et a!., 1995). Variation has also been found in crops (e.g.…”

Section: Dynamics Of Gynodioecymentioning

confidence: 99%

“…The maintenance of gynodioecy has been the object of several theoretical studies (Charlesworth & Charlesworth, 1978;Ross, 1980;Frank, 1989;Gouyon et al, 1991). Cytoplasmic-nuclear inheritance has been found to be important for the maintenance of the system.…”

Section: Introductionmentioning

confidence: 99%

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The dynamics of gynodioecy in Plantago lanceolata L. I. Frequencies of male-steriles and their cytoplasmic male sterility types

et al. 1997

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The maintenance of a gynodioecious breeding system (hermaphrodites and male-steriles) was studied in Plantago lanceolata. Cytoplasmic-nuclear inheritance is important in the maintenance of male-steriles. The male-sterile trait is cytoplasmically based (CMS), and male fertility can be restored by nuclear genes. Male-sterile frequencies differ among populations. Several hypotheses can be considered. (1) In each population a different equilibrium could be optimal because of environmentally dependent fitnesses. (2) None of the populations has reached an equilibrium (yet). (3) The populations are in different phases of a dynamic equilibrium, i.e. limit cycles. The last two explanations both predict a dynamic process, a continuous change within populations. Sex phenotype frequencies and their underlying gene frequencies were assessed. Sex phenotype frequencies changed over years within populations. We showed that these changes resulted from changes in genotype composition, which favours the two hypotheses (2 and 3) that predict a dynamic process. CMS-type frequencies were estimated using mtDNA markers. Among populations, CMS types differed in frequencies. CMSI and CMSIII seemed to exclude each other, and CMSIJ types occurred in all populations. In all populations, CMSI appeared to be less restored than the other CMS types. This was not expected on the basis of either of the two theoretical models that included dynamics (hypotheses 2 and 3).

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Section: Data and Theorysupporting

confidence: 82%

Section: Dynamics Of Gynodioecymentioning

confidence: 99%

Section: Dynamics Of Gynodioecymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The dynamics of gynodioecy in Plantago lanceolata L. I. Frequencies of male-steriles and their cytoplasmic male sterility types

et al. 1997

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“…Most of the theoretical studies on gynodioecy have focused on situations in which all cytotypes are malesterile, which is effectively the case of some well-studied gynodioecious species such as Silene vulgaris (Olson and McCauley, 2002), Silene acaulis (Städler and Delph, 2002) and Thymus vulgaris (Belhassen et al, 1991). However, male-fertile cytotypes have been reported in two selfincompatible gynodioecious species: Plantago lanceolata (De Haan et al, 1997b) and Beta vulgaris ssp.…”

Section: Introductionmentioning

confidence: 99%

Modelling the maintenance of male-fertile cytoplasm in a gynodioecious population

et al. 2007

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Gynodioecy is the co-occurrence of females and hermaphrodites in populations. It is usually due to the combined action of cytoplasmic male sterility (CMS) genes and nuclear genes that restore male fertility. According to previous theoretical studies, it is very difficult to explain the maintenance of gynodioecy with CMS and male-fertile cytotypes, although it has been observed in some species. However, only very specific situations have been investigated so far. We present a model to investigate the conditions that promote the maintenance of this breeding system in the case of an outcrossed species when CMS and male-fertile (non-CMS) cytotypes are present in an infinite panmictic population. We show that the type of cost of restoration strongly affects the conditions for stable maintenance of gynodioecy. Stable nuclear-cytoplasmic gynodioecy requires a female advantage, which is a classical condition for gynodioecy, but also a cost of CMS for female fitness, which had been rarely investigated. A cost of restoration is also needed, which could affect either pollen or seeds. Finally, we found that gynodioecy was attainable for a large set of parameter values, including low differences in fitness among genotypes and phenotypes. Our theoretical predictions are compared with previous theoretical work and with results of empirical studies on various gynodioecious species.

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Sexual tetramorphism in Thymelaea hirsuta (Thymelaeaceae): morph ratios in open‐pollinated progeny

Dommée

Biascamano

Denelle³

et al. 1995

American J of Botany

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Natural populations of Thymelaea hirsuta have previously been shown to comprise four distinct sexual morphs: males, females, protogynous individuals, i.e., first female then male, and protandrous individuals, i.e., first male then female. The objective of the present study has been to confirm the genetic basis of this sexual tetramorphism by quantifying morph ratios in the open‐pollinated progeny of the four sexual phenotypes growing in a natural population. All four phenotypes were recovered in the progeny of each morph. All observed plants displayed a single sexual phenotype, thus confirming the genetic basis of the tetramorphism. The progeny sex ratios indicate that the genetic determination of sex in this species may be influenced by cytoplasmic factors, while the observed levels of functional female fertility suggest a near‐dioecious system. The evolutionary significance of this tetramorphism as a transitional stage in the evolution of dioecy is discussed.

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Complex determination of male sterility in Thymus vulgaris L.: genetic and molecular analysis

Cited by 76 publications

References 38 publications

The dynamics of gynodioecy in Plantago lanceolata L. I. Frequencies of male-steriles and their cytoplasmic male sterility types

The dynamics of gynodioecy in Plantago lanceolata L. I. Frequencies of male-steriles and their cytoplasmic male sterility types

Modelling the maintenance of male-fertile cytoplasm in a gynodioecious population

Sexual tetramorphism in Thymelaea hirsuta (Thymelaeaceae): morph ratios in open‐pollinated progeny

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