Morphological and Electrophoretic Divergence between Layia discoidea and L. glandulosa

Gottlieb, L. D.; Warwick, S. I.; Ford, V. S.

doi:10.2307/2419141

Cited by 65 publications

(41 citation statements)

References 4 publications

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“…Patterns of genetic diversity observed here at the mtDNA level, together with data from 26 nuclear gene loci (Perron et al, 2000), provide additional support to the notion that the genetic variation detected in red spruce is a subset of that observed in black spruce. Such a trend is expected for a progenitor-derivative species pair (Gottlieb et al, 1985).…”

Section: Resultssupporting

confidence: 52%

New evidence from mitochondrial DNA of a progenitor‐derivative species relationship between black spruce and red spruce (Pinaceae)

Jaramillo‐Correa

Bousquet

2003

American J of Botany

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Mitochondrial DNA (mtDNA) markers were used to assess the genetic diversity in allopatric populations of black spruce (Picea mariana [Mill.] BSP) and red spruce (P. rubens Sarg.). Patterns of mitochondrial haplotypes (mitotypes) were strikingly different between the two species. All mtDNA markers surveyed were polymorphic in black spruce, revealing four different mitotypes and high levels of mtDNA diversity (P(p) = 100%, A = 2.0, H = 0.496). In contrast, populations of red spruce had only two mitotypes and harbored low levels of ggenetic diversity (P(p) = 13.2%, A = 1.1, H = 0.120). When the southernmost allopatric populations of red spruce were considered, only one mitotype was detected. As previously reported for nuclear gene loci, the diversity observed for mtDNA in red spruce was a subset of that found in black spruce. Comparison of present and previously published data supports the hypothesis of a recent progenitor-derivative relationship between these species, red spruce presumably being derived by allopatric speciation of an isolated population of black spruce during the Pleistocene.

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Section: Resultssupporting

confidence: 52%

New evidence from mitochondrial DNA of a progenitor‐derivative species relationship between black spruce and red spruce (Pinaceae)

Jaramillo‐Correa

Bousquet

2003

American J of Botany

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“…Perhaps a fascinating example yet to be demonstrated lies in the species pair of Layia glandulosa and its derived serpentinite endemic, L. discoidea (Gottlieb et al, 1985;Gottlieb and Ford, 1987;Gottlieb, 1989, 1990). Complete fertility exists between artificial crosses of these two species, but natural hybrids are not found in nature.…”

Section: Discussionmentioning

confidence: 99%

The Edaphic Factor in the Origin of Plant Species

Rajakaruna

2004

International Geology Review

180

135

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Although speciation has been a central focus in evolutionary biology for more than a century, there are very few case studies where we have a good understanding of the exact forces that may have acted in the diversification of a group of organisms. In order to examine such forces, botanists have often focused on closely related plants that are found under contrasting soil conditions. The study of such edaphically differentiated plants has provided valuable insight to the role of natural selection in evolution. This paper discusses several key studies that have appeared in the literature in the last half century emphasizing the role unusual soil conditions-such as those found on serpentinite outcrops, mine tailings, guano deposits, and salt flats-can play in the diversification of plant species. Many of these studies have not only shown adaptive differentiation in response to various edaphic features, but have also attempted to examine the link between adaptive traits and traits that are directly responsible for reproductive isolation between the divergent taxa. With the advent of novel genetic techniques and an increased understanding of the genetic architecture of various adaptive traits dealing with substrate tolerance, it will soon be possible to demonstrate the central role of the edaphic factor in plant evolution.

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“…Furthermore, the most common alleles of black spruce were fixed, or nearly fixed, in red spruce at 10 of 14 polymorphic loci. Generally, derivative species have been reported to have fewer unique alleles than their progenitors (5,43,45).…”

Section: Discussionmentioning

confidence: 99%

Evidence from sequence-tagged-site markers of a recent progenitor-derivative species pair in conifers

Perron

Perry

Andalo

et al. 2000

Proc. Natl. Acad. Sci. U.S.A.

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Black spruce (Picea mariana [B.S.P.] Mill.) and red spruce (Picea rubens Sarg.) are two conifer species known to hybridize naturally in northeastern North America. We hypothesized that there is a progenitor-derivative relationship between these two taxa and conducted a genetic investigation by using sequence-tagged-site markers of expressed genes. Based on the 26 sequence-tagged-site loci assayed in this study, the unbiased genetic identity between the two taxa was quite high with a value of 0.920. The mean number of polymorphic loci, the mean number of alleles per polymorphic locus, and the average observed heterozygosity were lower in red spruce (P ‫؍‬ 35%, A P ‫؍‬ 2.1, Ho ‫؍‬ 0.069) than in black spruce (P ‫؍‬ 54%, AP ‫؍‬ 2.9, Ho ‫؍‬ 0.103). No unique alleles were found in red spruce, and the observed patterns of allele distribution indicated that the genetic diversity of red spruce was essentially a subset of that found in black spruce. When considered in combination with ecological evidence and simulation results, these observations clearly support the existence of a progenitor-derivative relationship and suggest that the reduced level of genetic diversity in red spruce may result from allopatric speciation through glaciation-induced isolation of a preexisting black spruce population during the Pleistocene era. Our observations signal a need for a thorough reexamination of several conifer species complexes in which natural hybridization is known to occur. allopatric speciation ͉ genetic diversity ͉ natural introgressive hybridization ͉ Pleistocene ͉ red spruce

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Morphological and Electrophoretic Divergence between Layia discoidea and L. glandulosa

Cited by 65 publications

References 4 publications

New evidence from mitochondrial DNA of a progenitor‐derivative species relationship between black spruce and red spruce (Pinaceae)

New evidence from mitochondrial DNA of a progenitor‐derivative species relationship between black spruce and red spruce (Pinaceae)

The Edaphic Factor in the Origin of Plant Species

Evidence from sequence-tagged-site markers of a recent progenitor-derivative species pair in conifers

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