The Variation in Spore Size and Germination in Dryopteris Taxa

Whittier, P.; Wagner, Warren H.

doi:10.2307/1546642

Cited by 19 publications

(6 citation statements)

References 3 publications

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“…borealis". Triploid individuals with irregular-shaped spores which are presumably sterile (Whittier & Wagner 1971) were also occasionally found among the specimens originally identified as "var. borealis", and evidence obtained from nuclear gapCpSh sequences and chromosome number suggested that they are hybrids between "var.…”

Section: Discussionmentioning

confidence: 99%

Thelypteris sylva-nipponica, a new allotetraploid species in the Parathelypteris group (Thelypteridaceae)

Ebihara

Nakato²,

Ohi-Toma

et al. 2020

Phytotaxa

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A broad-leaved form of Thelypteris nipponica, usually called “var. borealis”, was identified as an allotetraploid originated from hybridization between two diploid species T. nipponica and T. musashiensis based on chromosome number, plastid rbcL sequence and nuclear gapCp “short” sequence. We found that the original material of Thelypteris nipponica var. borealis morphologically corresponds not to the plant widely known as “var. borealis” but to diploid T. nipponica. Therefore, we described the tetraploid distributed in Japan and China as a new species, Thelypteris sylva-nipponica.

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Section: Discussionmentioning

confidence: 99%

Thelypteris sylva-nipponica, a new allotetraploid species in the Parathelypteris group (Thelypteridaceae)

Ebihara

Nakato²,

Ohi-Toma

et al. 2020

Phytotaxa

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“…The vast majority of homoploid hybrid ferns are assumed to be sterile, producing aborted or aberrant spores that often fail to germinate (Wagner & Chen, 1965;Wagner et al, 1986). In reality though, sterility in homoploid hybrids is "relative rather than absolute" (Benedict, 1945), and the production of viable spores can vary between crosses, individuals, and even sporangia on the same individual (Benedict, 1911;Manton, 1950;Wagner & Whitmire, 1957;Morzenti, 1962Morzenti, , 1967DeBenedictus, 1969;Whittier & Wagner, 1971;Hickok & Klekowski, 1973;Wagner, 1974;Pryer & Britton, 1983;Wagner et al, 1986;Rabe & Haufler, 1992).…”

Section: Homoploid Hybridsmentioning

confidence: 99%

“…Rare, completely fertile homoploid hybrids, such as Pteris quadriaurita Â multiaurita reported by Walker (1958Walker ( , 1962, result from crosses between sexual species with low genetic divergence and exhibit full pairing of homoeologs (i.e., chromosome copies derived from different progenitor species; Glover et al, 2016) at meiosis. Additional studies have reported homoploid hybrids with spore germination rates as high as 29-40% and gametophytes producing functional sperm and/or eggs (Walker, 1958(Walker, , 1962Whittier & Wagner, 1971;Bierhorst, 1977;Conant, 1990;Mayer & Mesler, 1993;Mullenniex et al, 1998).…”

Section: Homoploid Hybridsmentioning

confidence: 99%

Genetic and genomic aspects of hybridization in ferns

Sigel

2016

J of Sytematics Evolution

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The morphological and ecological intermediacy of hybrid taxa has long interested and challenged fern biologists, resulting in numerous systematic contributions focused on disentangling relationships within reticulate species complexes. From a genetic perspective, hybrid ferns are especially interesting because they represent the union of divergent parental genomes in unique evolutionary entities. This review summarizes advances in our knowledge of the genetic and genomic aspects of hybridization in ferns from the mid-20th century to the present. The different organismal products of hybridization, evolutionary aspects of additive and non-additive gene expression in allopolyploids, genetic and genomic mechanisms leading to gene silencing and loss, the roles of multiple origins and introgression for imparting genetic variation to hybrid fern taxa and their progenitors, and the utility of allopolyploid ferns to investigate mechanisms of genome evolution in the homosporous ferns are discussed. Comparisons are made to other plant lineages and important future research directions are highlighted, with the goal of stimulating additional research on hybrid ferns.

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“…5), although there are some exceptions (Whittier & Wagner 1961, Conant & Cooper-Driver 1980, Hegarty & Hiscock 2005. Many fern species are thought to be derived from hybrids, because morphological comparison with allied taxa generates evidences of intermediate, but they behave as a true and autonomous species.…”

Section: Hybridization With Some Thoughts Around the Species Conceptmentioning

confidence: 99%

Profundizando en la evolución de los helechos: un enfoque mecanicista a los principales conceptos y técnicas de estudio

2014

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The Variation in Spore Size and Germination in Dryopteris Taxa

Cited by 19 publications

References 3 publications

<p><strong><em>Thelypteris sylva-nipponica</em></strong><strong>, a new allotetraploid species in the <em>Parathelypteris</em> group (Thelypteridaceae)</strong></p>

<p><strong><em>Thelypteris sylva-nipponica</em></strong><strong>, a new allotetraploid species in the <em>Parathelypteris</em> group (Thelypteridaceae)</strong></p>

Genetic and genomic aspects of hybridization in ferns

Profundizando en la evolución de los helechos: un enfoque mecanicista a los principales conceptos y técnicas de estudio

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