Levels of Confidence in the Analysis of Hybridization in Plants

Gottlieb, L. D.

doi:10.2307/2395153

Cited by 82 publications

(63 citation statements)

References 7 publications

(8 reference statements)

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“…Although no single criterion can provide a clear means for testing a hypothesis of hybridization, each criterion that can be met provides a higher level of evidence of a hybrid origin (Gottlieb 1972;Padgett et al 1998). In the present study, geographic overlap, intermediate morphology, fertility and molecular data of R. agastum satisfy the four criteria of Gottlieb.…”

Section: Discussionmentioning

confidence: 99%

Natural hybridization origin of Rhododendron agastum (Ericaceae) in Yunnan, China: inferred from morphological and molecular evidence

Zhang

Gao

et al. 2007

J Plant Res

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The natural hybridization that occurs between two sympatric species of Rhododendron subgenus Hymenanthes in Yunnan, China, was investigated. The assumed parents, Rhododendron delavayi Franch. and R. decorum Franch., are morphologically distinct, and the putative hybrid species, R. agastum Balf. f. et W. W. Smith, has an intermediate morphology. We used the main morphological characters, sequences of the nuclear ribosomal DNA ITS region, and the chloroplast DNA trnL-F intronspacer to analyze the three species, and compared these morphological and molecular data with an artificial hybrid between R. decorum (female symbol) x R. delavayi (male symbol). From the results, we conclude that R. agastum is a natural hybrid between a female R. delavayi and a male R. decorum.

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Section: Discussionmentioning

confidence: 99%

Natural hybridization origin of Rhododendron agastum (Ericaceae) in Yunnan, China: inferred from morphological and molecular evidence

Zhang

Gao

et al. 2007

J Plant Res

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“…Clarifying evolutionary relationships among intergrading or intermediate taxa (Gottlieb 1972;Heiser 1973;Avise 1986) may challenge the germplasm manager's judgment and acuity. It is particularly vital for germplasm management purposes to discriminate recently synthesized, naturally occurring hybrids and/or hybrid derivatives from taxonomically intermediate taxa originating from convergent-parallel evolution, clinal variation, recombinational speciation, and/or the retention of intermediate ancestral traits (the latter including the phenomenon termed lineage sorting, Avise 1986).…”

Section: Plant Genetic Resource Management a Genetic Markers Anmentioning

confidence: 99%

Genetic Markers and Plant Genetic Resource Management

Bretting

Widrlechner

1995

Plant Breeding Reviews

137

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“…Empirical data on interspecific gene flow are often difficult to interpret because shared polymorphisms between species may be interpreted to result from introgression and/or from the joint retention of ancestral alleles (Gottlieb 1972;Heiser 1973;Rieseberg and Wendel 1993;Hey et al 2004;Muir and Schlö tterer 2005;Lexer et al 2006;Patterson et al 2006). The introgression hypothesis is favored if (1) the species hybridize frequently (both now and in the past); (2) associations are found between linked markers (Doebley 1989;Hey et al 2004;Scotti-Saintagne et al 2004a); (3) genetic distances vary across the genome (Stump et al 2005;Turner et al 2005) and are highest near loci that contribute to species differences or reproductive isolation; and (4) populations or species with sympatric or parapatric distributions are less divergent on average than those with a history of allopatry.…”

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confidence: 99%

Rampant Gene Exchange Across a Strong Reproductive Barrier Between the Annual Sunflowers,Helianthus annuusandH. petiolaris

et al. 2007

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Plant species may remain morphologically distinct despite gene exchange with congeners, yet little is known about the genomewide pattern of introgression among species. Here we analyze the effects of persistent gene flow on genomic differentiation between the sympatric sunflower species Helianthus annuus and H. petiolaris. While the species are strongly isolated in testcrosses, genetic distances at 108 microsatellite loci and 14 sequenced genes are highly variable and much lower (on average) than for more closely related but historically allopatric congeners. Our analyses failed to detect a positive association between levels of genetic differentiation and chromosomal rearrangements (as reported in a prior publication) or proximity to QTL for morphological differences or hybrid sterility. However, a significant increase in differentiation was observed for markers within 5 cM of chromosomal breakpoints. Together, these results suggest that islands of differentiation between these two species are small, except in areas of low recombination. Furthermore, only microsatellites associated with ESTs were identified as outlier loci in tests for selection, which might indicate that the ESTs themselves are the targets of selection rather than linked genes (or that coding regions are not randomly distributed). In general, these results indicate that even strong and genetically complex reproductive barriers cannot prevent widespread introgression.

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Levels of Confidence in the Analysis of Hybridization in Plants

Cited by 82 publications

References 7 publications

Natural hybridization origin of Rhododendron agastum (Ericaceae) in Yunnan, China: inferred from morphological and molecular evidence

Natural hybridization origin of Rhododendron agastum (Ericaceae) in Yunnan, China: inferred from morphological and molecular evidence

Genetic Markers and Plant Genetic Resource Management

Rampant Gene Exchange Across a Strong Reproductive Barrier Between the Annual Sunflowers,Helianthus annuusandH. petiolaris

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