Hybridization between wheat (Triticum aestivum) and the wild species Aegilops geniculata and A. biuncialis under experimental field conditions

Loureiro, Íñigo; Escorial, María Concepción; García-Baudín, J. M.; Chueca, María Cristina

doi:10.1016/j.agee.2006.10.015

Cited by 19 publications

(31 citation statements)

References 25 publications

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“…Compared to other autogamous cereals, gene flow from foxtail millet to its closest wild relative was lower than in the case of wheat to Aegilops sp. (Morrison et al 2002;Loureiro et al 2007), but fell in a range similar to that of rice to wild and weedy rice (Geally 2005). However, the proximity of the crop and the wild genomes make the hybrids more productive than in wheat, so that the persistence of crop genes into the wild populations is certainly higher.…”

Section: Discussionmentioning

confidence: 99%

Impact of Transgene Inheritance on the Mitigation of Gene Flow Between Crops and Their Wild Relatives: The Example of Foxtail Millet

Shí

Wang

et al. 2008

Genetics

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Developing genetically modified crop plants that are biologically contained could reduce significantly the potential spread of transgenes to conventional and organic crop plants and to wild or weedy relatives. Among several strategies, the hereditary mode of transmission of transgenes, whether dominant, recessive, or maternal, could play a major role in interspecific gene flow. Here we report on the gene flow between foxtail millet (Setaria italica), an autogamous crop, and its weedy relative, S. viridis, growing within or beside fields containing the three kinds of inherited herbicide resistance. Over the 6-year study, in the absence of herbicide selection, the maternal chloroplast-inherited resistance was observed at a 2 3 10 À6 frequency in the weed populations. Resistant weed plants were observed 60 times as often, at 1.2 3 10 À4 in the case of the nuclear recessive resistance, and 190 times as often, at 3.9 3 10 À4 in the case of the dominant resistance. Because the recessive gene was not expressed in the first-generation hybrids, it should be more effective than dominant genes in reducing gene flow under normal agricultural conditions where herbicides are sprayed because interspecific hybrids cannot gain from beneficial genes.

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Section: Discussionmentioning

confidence: 99%

Impact of Transgene Inheritance on the Mitigation of Gene Flow Between Crops and Their Wild Relatives: The Example of Foxtail Millet

Shí

Wang

et al. 2008

Genetics

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“…; Zaharieva & Monneveux ), have been reported from botanical surveys (Van Slageren ), open pollination experiments in field conditions (Loureiro et al . ) and population genetic surveys (Arrigo et al . ; Parisod et al .…”

Section: Discussionmentioning

confidence: 99%

“…; Loureiro et al . , ; Arrigo et al . ), it still shows, using molecular evidence, that an appreciable number of viable and fertile hybrids steadily transfer wheat DNA to Ae.…”

Section: Discussionmentioning

confidence: 99%

“…This genetic relatedness and geographical proximity have been widely exploited for wheat improvement purposes and sustain occasional wheat x Aegilops hybrids in natural populations (Hegde & Waines ; Loureiro et al . , ,b, ; Zaharieva & Monneveux ). For instance, bread wheat ( T. aestivum ) resulted from the spontaneous hybridization of durum wheat ( T. durum ) with Ae.…”

Section: Introductionmentioning

confidence: 98%

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Wheat alleles introgress into selfing wild relatives: empirical estimates from approximate Bayesian computation in Aegilops triuncialis

et al. 2014

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Extensive gene flow between wheat (Triticum sp.) and several wild relatives of the genus Aegilops has recently been detected despite notoriously high levels of selfing in these species. Here, we assess and model the spread of wheat alleles into natural populations of the barbed goatgrass (Aegilops triuncialis), a wild wheat relative prevailing in the Mediterranean flora. Our sampling, based on an extensive survey of 31 Ae. triuncialis populations collected along a 60 km × 20 km area in southern Spain (Grazalema Mountain chain, Andalousia, totalling 458 specimens), is completed with 33 wheat cultivars representative of the European domesticated pool. All specimens were genotyped with amplified fragment length polymorphism with the aim of estimating wheat admixture levels in Ae. triuncialis populations. This survey first confirmed extensive hybridization and backcrossing of wheat into the wild species. We then used explicit modelling of populations and approximate Bayesian computation to estimate the selfing rate of Ae. triuncialis along with the magnitude, the tempo and the geographical distance over which wheat alleles introgress into Ae. triuncialis populations. These simulations confirmed that extensive introgression of wheat alleles (2.7 × 10(-4) wheat immigrants for each Ae. triuncialis resident, at each generation) into Ae. triuncialis occurs despite a high selfing rate (Fis ≈ 1 and selfing rate = 97%). These results are discussed in the light of risks associated with the release of genetically modified wheat cultivars in Mediterranean agrosystems.

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“…biuncialis and Ae. geniculata under semi-natural conditions are around 0.3% (Loureiro et al, 2007) while the frequencies of amphiploid formation obtained in this study vary from 3.7 to 28.5 per 100 F 1 hybrids studied between Ae. biuncialis and wheat and from 2.5 to 10 amphiploids for Ae.…”

Section: Discussionmentioning

confidence: 99%

Spontaneous wheat-Aegilops biuncialis, Ae. geniculata and Ae. triuncialis amphiploid production, a potential way of gene transference

Loureiro

Escorial

García-Baudín

et al. 2009

Span. j. agric. res.

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Some F1 hybrid plants between three species of the Aegilops genus and different hexaploid wheat Triticum aestivum cultivars show certain self-fertility, with averages of F1 hybrids bearing F2 seeds of 8.17%, 5.12% and 48.14% for Aegilops biuncialis, Aegilops geniculata and Aegilops triuncialis respectively. In the Ae. triuncialis-wheat combination with ";Astral" wheat cultivar, the fertility was higher than that found in the other combinations. All the F2 seeds studied were spontaneous amphiploids (2n=10x=70). The present study evidences the possibility of spontaneous formation of amphiploids between these three Aegilops species and hexaploid wheat and discusses their relevance for gene transference. Future risk assessment of transgenic wheat cultivars needs to evaluate the importance of amphiploids as a bridge for transgene introgression and for gene escape to the wild.

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Hybridization between wheat (Triticum aestivum) and the wild species Aegilops geniculata and A. biuncialis under experimental field conditions

Cited by 19 publications

References 25 publications

Impact of Transgene Inheritance on the Mitigation of Gene Flow Between Crops and Their Wild Relatives: The Example of Foxtail Millet

Impact of Transgene Inheritance on the Mitigation of Gene Flow Between Crops and Their Wild Relatives: The Example of Foxtail Millet

Wheat alleles introgress into selfing wild relatives: empirical estimates from approximate Bayesian computation in Aegilops triuncialis

Spontaneous wheat-Aegilops biuncialis, Ae. geniculata and Ae. triuncialis amphiploid production, a potential way of gene transference

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