The Hybrid Nature of Encelia laciniata (Compositae: Heliantheae) and Control of Population Composition by Post-Dispersal Selection

Kyhos, Donald W.; Clark, Curtis; Thompson, William C.

doi:10.2307/2418451

Cited by 41 publications

(50 citation statements)

References 8 publications

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“…Samples identified as E. 3 laciniata in this study are most likely hybrids between E. ventorum and E. asperifolia. Although this designation more properly applies to hybrids between E. ventorum and E. palmeri, it has also been used to designate E. ventorum 3 E. asperifolia hybrid plants (Kyhos et al 1981). Two species previously treated as Encelia, E. stenophylla and E. scaposa (Blake 1913), have since been shown to be distinct in morphology, secondary chemistry (Proksch and Clark 1987;Proksch et al 1988), and DNA sequences (Fehlberg, unpubl.…”

Section: Methodsmentioning

confidence: 99%

“…Natural hybridization has been documented to occur whenever species are sympatric (Clark 1998). For example, E. 3 laciniata is a recurring hybrid between E. ventorum and E. palmeri (Kyhos et al 1981). In addition, two stable diploid species, E. virginensis and E. asperifolia, have been proposed to be of hybrid origin (Allan et al 1997;Clark and Allan 1997).…”

mentioning

confidence: 99%

“…In addition, two stable diploid species, E. virginensis and E. asperifolia, have been proposed to be of hybrid origin (Allan et al 1997;Clark and Allan 1997). Although hybridization has the potential to obscure or even eliminate interspecific differentiation in Encelia, it has been suggested on the basis of narrow hybrid zones and apparent absences of F 2 and backcrossed progeny in natural populations (Kyhos et al 1981), that strong postdispersal selection against backcrossed progeny plays an important role in limiting interspecific gene flow and maintaining the integrity of species (Kyhos et al 1981;Allan et al 1997).…”

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confidence: 99%

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Phylogeny and Biogeography of Encelia (Asteraceae) in the Sonoran and Peninsular Deserts Based on Multiple DNA Sequences

Fehlberg

Ranker²

2007

Systematic Botany

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Encelia, Enceliopsis, and Geraea are three closely related genera of shrubs and herbs distributed in the arid lands of western North and South America. Resolution of relationships within Encelia has traditionally been difficult because there is some morphological overlap among species, and species hybridize when sympatric. In this study, we used DNA sequence data from two nuclear regions (ITS and ETS) and two chloroplast regions (psbA-trnH and trnS-trnfM) to infer phylogenetic relationships among 19 species, subspecies, and varieties of Encelia. Eight species of Enceliopsis, Geraea, Simsia, and Bahiopsis were also included as outgroups. These data support previous hypotheses suggesting that Encelia is monophyletic and sister to Enceliopsis + Geraea. In addition, our data provide evidence for two major subclades within Encelia that are supported by morphological synapomorphies. However, little differentiation was observed among species of Encelia within subclades. This lack of differentiation may be the result of a recent diversification of the genus including recent radiation in the Peninsular Desert.

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Phylogeny and Biogeography of Encelia (Asteraceae) in the Sonoran and Peninsular Deserts Based on Multiple DNA Sequences

Fehlberg

Ranker²

2007

Systematic Botany

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“…F 1 s are very rare despite that post-F 1 s are common in Iris hybrid zones (Arnold 1993) and in some Rhododendron species in Turkey (Milne et al 1999). Contrarily, superiority of F 1 genotypes has been reported in Encelia (Kihos et al 1981), Quercus (Nason et al 1992), Rhododendron (Milne et al 1999, Milne et al 2003Zha et al 2008), Utricularia (Kameyama et al 2005) and Sonneratia (Zhou et al 2005). There are several possible explanations why F 1 Shorea hybrids are dominant in Bukit Timah.…”

Section: Taxonomic Implications Of Hybridsmentioning

confidence: 99%

“…Kihos et al (1981) has demonstrated that hybrid species, Encelia laciniata, displaces the parental species in areas of extreme disturbance. Increased rate of hybridization with anthropogenic habitat disturbance has also been suggested in Sino-Himalayan Rhododendron species (Zha et al 2008).…”

Section: Taxonomic Implications Of Hybridsmentioning

confidence: 99%

Morphological and molecular evidence of natural hybridization in Shorea (Dipterocarpaceae)

Kamiya

Gan

Lum

et al. 2010

Tree Genetics & Genomes

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Shorea (Dipterocarpaceae) is a large genus in which many closely related species often grow together in Southeast Asian lowland tropical rain forests. Many Shorea species share common pollinators, and earlier studies suggested occurrence of interspecific hybridization and introgression. Here, we show morphological and molecular evidence of hybridization between Shorea species. In the census of all the trees of Shorea curtisii, Shorea leprosula, and Shorea parvifolia (>30 cm dbh) within the 164-ha area of Bukit Timah Nature Reserve in Singapore, we found 21 morphologically recognizable hybrid individuals. All of the putative hybrids could be distinguished obviously from the parental species on the basis of vegetative characters. Population genetic analysis of DNA sequences of two nuclear (GapC and PgiC) and chloroplast (trnL-trnF) regions demonstrated that each of the three species had several species-specific mutations. The nuclear sequences of the putative hybrids were heterozygote at all the speciesspecific sites between two parental species. Hybrid between S. curtisii and S. leprosula was found most, while S. curtisii × S. parvifolia and S. leprosula × S. parvifolia hybrids were also found. Almost no shared polymorphism between populations of the parental species suggests rarity of introgression. The study indicated that natural hybridization between sympatric Shorea species should not be uncommon, but all of the hybrid individuals were F 1 , and the post-F 1 hybrids were considerably rare.

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Embryo excision in Compositae, with implications for combating biodiversity loss

Baldwin,

Fawcett,

Wolkis

2024

Appl Plant Sci

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PremiseEmbryo excision is an effective, under‐described means of promoting germination in the sunflower family and may help to ensure the survival of endangered taxa or lineages with limited seed availability.Methods and ResultsWe describe and illustrate a detailed method of embryo excision used successfully to stimulate germination in a diversity of composites and that requires minimal materials and expense, using Layia platyglossa as an example. We show how this procedure greatly increases germination compared to control treatments in Madia elegans, a close relative of Hawaiian silverswords that exhibits physiological dormancy.ConclusionsThis technique can be learned quickly and is highly effective. Embryo excision can aid conservation efforts dependent on minimal seed resources by enhancing germination and allowing evaluation of seed quality before or after storage, as well as synchronizing seedling development, thereby allowing for refinement of ex situ seed bank conditions and efficient use of horticultural resources.

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The Hybrid Nature of Encelia laciniata (Compositae: Heliantheae) and Control of Population Composition by Post-Dispersal Selection

Cited by 41 publications

References 8 publications

Phylogeny and Biogeography of Encelia (Asteraceae) in the Sonoran and Peninsular Deserts Based on Multiple DNA Sequences

Phylogeny and Biogeography of Encelia (Asteraceae) in the Sonoran and Peninsular Deserts Based on Multiple DNA Sequences

Morphological and molecular evidence of natural hybridization in Shorea (Dipterocarpaceae)

Embryo excision in Compositae, with implications for combating biodiversity loss

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