Pollen dispersal and interspecific gene flow in louisiana irises

Arnold, Michael L.; Robinson, J. J.; Buckner, Cindy M.; Bennet, B D

doi:10.1038/hdy.1992.59

Cited by 51 publications

(28 citation statements)

References 28 publications

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“…Such intraspecific diversity in plant cpDNA may be caused by the introgression of a foreign cpDNA (chloroplast capture) from related species in wild species (e.g. 'Louisiana Iris' group, Arnold et al 1992). However, no case of chloroplast capture has been reported within Aegilops-Triticum group so far.…”

Section: Discussionmentioning

confidence: 96%

Identification of Aegilops L. species and Triticum aestivum L. based on chloroplast DNA

Haider

Nabulsi

2007

Genet Resour Crop Evol

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The genus Aegilops L. is a very important genetic resource for the breeding of bread wheat Triticum aestivum. Therefore, an accurate and easy identification of Aegilops species is required. Traditionally, identification of Aegilops species has relied heavily on morphological characters. These characters, however, are either not variable enough among Aegilops species or too plastic to be used for identification at the species level. Molecular markers that are more stable within species, therefore, could be the alternative strategy towards an accurate identification. Since the chloroplast DNA has a lower level of evolution compared to the nuclear genome, an attempt was made in this study to investigate polymorphism in the chloroplast DNA among 21 Aegilops species (including Ae. mutica that is now known as Amblyopyrum muticum) and between the latter and T. aestivum to generate markers for the diagnosis of all targeted species. Cleaved amplified polymorphic sequence (CAPS) applied on 22 coding and non-coding chloroplast regions using 80 endonucleases and sequencing of two of those regions revealed little polymorphism between T. aestivum and the various Aegilops species examined and to a less extent was the variation among Aegilops species. Polymorphism observed among species analysed allowed the discrimination of T. aestivum and 12 Aegilops species.

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Section: Discussionmentioning

confidence: 96%

Identification of Aegilops L. species and Triticum aestivum L. based on chloroplast DNA

Haider

Nabulsi

2007

Genet Resour Crop Evol

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“…In a simple‐minded approach, we used the polymerase chain reaction (PCR) to amplify portions of the cpDNA from the Louisiana Iris species. We digested these products with restriction endonucleases (Arnold et al . 1991, 1992).…”

Section: Introgression Via Adam or Eve?mentioning

confidence: 99%

Anderson’s paradigm: Louisiana Irises and the study of evolutionary phenomena

Arnold

2000

Molecular Ecology

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“…When I. fulva and I. brevicaulis coexist, hybrid populations often result (e.g., Arnold et al 1992;Arnold 1993). However, few, if any, F 1 hybrids have been observed in these natural, hybrid populations (Johnston et al 2001).…”

Section: Implications For Natural Hybridization In Sympatric Populatimentioning

confidence: 99%

Loci Affecting Long-Term Hybrid Survivorship in Louisiana Irises: Implications for Reproductive Isolation and Introgression

2005

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Abstract. Iris fulva and I. brevicaulis are long-lived plant species known to hybridize where they coexist in nature. Year-to-year survival contributes significantly to overall fitness for both species and their hybrid derivatives, and differences in hybrid survivability may have important consequences to interspecific gene flow in nature. We examined the genetic architecture of long-term survivorship of reciprocal backcross I. fulva ϫ I. brevicaulis hybrids in a commongarden, greenhouse environment. Differences in mortality were found between the two backcross (BC 1 ) hybrid classes, with hybrids crossed toward I. fulva (BCIF) revealing twice the mortality of those hybrids backcrossed toward I. brevicaulis (BCIB). Using genomic scans on two separate genetic linkage maps derived from the reciprocal hybrid populations, we found that hybrid survivorship is influenced by several genetic regions. Multiple interval mapping (MIM) revealed four quantitative trait loci (QTLs) in BCIF hybrids that were significantly associated with survivorship. Introgressed I. brevicaulis DNA increased survivorship at three of the four QTLs. For the fourth QTL, introgressed I. brevicaulis DNA was associated with decreased survivorship. No QTLs were detected in BCIB hybrids; however, single-marker analysis revealed five unlinked loci that were significantly associated with survivorship. At all five markers, survivorship was positively associated with introgressed I. fulva DNA. The present findings have important implications for the evolutionary dynamics of naturally occurring hybrid zones. Regions of the genome that increase survivorship when in a heterozygous (i.e., hybrid) state should have an increased likelihood of passing across species boundaries, whereas those that decrease survivorship will be less likely to introgress.

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Pollen dispersal and interspecific gene flow in louisiana irises

Cited by 51 publications

References 28 publications

Identification of Aegilops L. species and Triticum aestivum L. based on chloroplast DNA

Identification of Aegilops L. species and Triticum aestivum L. based on chloroplast DNA

Anderson’s paradigm: Louisiana Irises and the study of evolutionary phenomena

Loci Affecting Long-Term Hybrid Survivorship in Louisiana Irises: Implications for Reproductive Isolation and Introgression

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