RAPID EVOLUTION IN
            <i>CLARKIA</i>

Lewis, Harlan; Raven, Peter H.

doi:10.1111/j.1558-5646.1958.tb02962.x

Cited by 66 publications

(5 citation statements)

References 34 publications

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“…An important feature of inversions is that they appear to be a source of particular adaptive combinations of genes (Grant, 1981;Rieseberg and Willis, 2007), and could capture and spread locally adapted alleles in a population by suppressing recombination between the loci (Hoffmann et al, 2004;Kirkpatrick and Barton, 2006). Survival and reproduction of self-compatible genotypes may give rise to an endemic form of the species that is adapted to the new environment, while the parental species recedes or disappears (Lewis and Raven, 1958;Lewis, 1962;Grant, 1981;Tchernov, 1988). We propose that the scenario of sympatric speciation has occurred in the sect.…”

Section: Morphological and Physiological Characteristics Of Plants From Peripheral And Marginal Populationsmentioning

confidence: 99%

Chromosome evolution in marginal populations of Aegilops speltoides: causes and consequences

Belyayev

2013

Annals of Botany

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Considerable genomic variation at the chromosomal level was found in the marginal populations of Ae. speltoides. It is likely that a specific combination of gene mutations and chromosomal repatterning has produced the evolutionary trend in each specific case, i.e. for a particular species or group of related species in a given period of time and in a certain habitat. The appearance of a new chromosomal pattern is considered an important factor in promoting the emergence of interbreeding barriers.

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Section: Morphological and Physiological Characteristics Of Plants From Peripheral And Marginal Populationsmentioning

confidence: 99%

Chromosome evolution in marginal populations of Aegilops speltoides: causes and consequences

Belyayev

2013

Annals of Botany

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“…Such internal barriers between annuals and perennials are present in many other genera (see Grant 1981), and are also found in the Macaronesian species of Scrophularia (Dalgaard 1979) and Lobularia (Borgen 1984). These barriers may be due to chromosomal repatterning, which seems to be prevalent among autogamous annuals owing to inbreeding, which induces chromosome breakage and rearrangements (Lewis & Raven 1958, Lewis 1962). Bubonium aquaticum is probably an example of this mode of speciation.…”

Section: Isolation Barriers and Fertility Relationshipsmentioning

confidence: 93%

The perennial Macaronesian species of Bubonium (Compositae - Inuleae).

Halvorsen¹,

Borgen

1986

Sommerfeltia

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Six perennial Macaronesian species are recognized in Bubonium J. Hill emend. Briq.: the Cape Verdian B. daltonii (Webb) T. Halvorsen, with two subspecies, ssp. daltonii and ssp. vogelii (Webb) T. Halvorsen, and B. smithii (Webb) T. Halvorsen; and the Canarian B. intermedium (DC.) T. Halvorsen & Wikl., B. graveolens (Forssk.) Maire, with two subspecies, ssp. odorum (Schousb.) Wikl. and ssp. stenophyllum (Link) T. Halvorsen, B. schultzii (Balle) Sventenius and B. sericeum (L.f.) T. Halvorsen & Wikl. Four Mediterranean annuals are superficially treated for Macaronesia: B. aquaticum (L.) Hill, Asteriscus maritimus (L.) Less., A. hierochunticus (Michon) Wikl., and A. spinosus (L.) Sch. Bip. A key to the Macaronesian Bubonium species is provided. The chromosome number n=7 is reported for all the Bubonium species in Macaronesia; in B. graveolens ssp. odorum, B. daltonii ssp. vogelii, and B. smithii for the first time. The chromosome number n=6 is confirmed for Asteriscus maritimus. The self fertile annuals are not cross compatible with the other species. Among the predominantly self incompatible perennials internal barriers to gene exchange are weak. Only B. schultzii seems genetically isolated. Between the other perennials the crossability is complete and hybrid fertility high between species from the same archipelago, but reduced between species from different archipelagos. The present occurrence of the Canarian species B. sericeum and B. intermedium and the Cape Verdean B. daltonii and B. smithii seems relict. These frutescent endemics probably belong to an old element in the Macaronesian flora.

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“…The reductions in hybrid fertilities were accompanied by increases in the proportion of PMCs with meiotic abnormalities. For example, for the nine hybrids analyzed cyto- (Lewis & Raven, 1958;Lewis, 1966) that hybrid sterility in annual plants often results from differences in chromosome structure and that these differences can accumulate in a relatively small number of generations. The level of confidence in the inference that Diegensis has a hybrid origin is not as high as with Carotifera or the tetraploids.…”

Section: Poll 'Cmentioning

confidence: 99%

Levels of Confidence in the Analysis of Hybridization in Plants

Gottlieb¹

1972

Annals of the Missouri Botanical Garden

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RAPID EVOLUTION IN CLARKIA

Cited by 66 publications

References 34 publications

Chromosome evolution in marginal populations of Aegilops speltoides: causes and consequences

Chromosome evolution in marginal populations of Aegilops speltoides: causes and consequences

The perennial Macaronesian species of Bubonium (Compositae - Inuleae).

Levels of Confidence in the Analysis of Hybridization in Plants

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