The emergence of a new weed in maize plantations: characterization and genetic structure using microsatellite markers

Díaz, Aurora; Taberner, A.; Vilaplana, Lluı̈sa

doi:10.1007/s10722-019-00828-z

Cited by 8 publications

(14 citation statements)

References 37 publications

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“…Instead, Spanish teosintes were found intermediate between maize and mexicana (25). Microsatellite markers further confirmed the importance of maize contribution to the genetic make-up of Spanish teosintes (26). Here, we collected French teosinte populations and describe for the first time their genetic diversity.…”

Section: Introductionmentioning

confidence: 63%

“…In other words, our results are consistent with a scenario where European maize varieties adapted to temperate latitudes have contributed to the establishment of teosintes in Europe. Note that hybridization is seemingly still occurring, as plants carrying hybrid-like cobs are regularly observed in infested maize fields in Spain (25,26) as well as in France (SI Appendix, Fig. S10).…”

Section: Discussionmentioning

confidence: 99%

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Adaptive introgression from maize has facilitated the establishment of teosinte as a noxious weed in Europe

Corre

Siol

Vigouroux

et al. 2020

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

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Global trade has considerably accelerated biological invasions. The annual tropical teosintes, the closest wild relatives of maize, were recently reported as new agricultural weeds in two European countries, Spain and France. Their prompt settlement under climatic conditions differing drastically from that of their native range indicates rapid genetic evolution. We performed a phenotypic comparison of French and Mexican teosintes under European conditions and showed that only the former could complete their life cycle during maize cropping season. To test the hypothesis that crop-to-wild introgression triggered such rapid adaptation, we used single nucleotide polymorphisms to characterize patterns of genetic variation in French, Spanish, and Mexican teosintes as well as in maize germplasm. We showed that both Spanish and French teosintes originated from Zea mays ssp. mexicana race “Chalco,” a weedy teosinte from the Mexican highlands. However, introduced teosintes differed markedly from their Mexican source by elevated levels of genetic introgression from the high latitude Dent maize grown in Europe. We identified a clear signature of divergent selection in a region of chromosome 8 introgressed from maize and encompassing ZCN8, a major flowering time gene associated with adaptation to high latitudes. Moreover, herbicide assays and sequencing revealed that French teosintes have acquired herbicide resistance via the introgression of a mutant herbicide-target gene (ACC1) present in herbicide-resistant maize cultivars. Altogether, our results demonstrate that adaptive crop-to-wild introgression has triggered both rapid adaptation to a new climatic niche and acquisition of herbicide resistance, thereby fostering the establishment of an emerging noxious weed.

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Section: Introductionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Adaptive introgression from maize has facilitated the establishment of teosinte as a noxious weed in Europe

Corre

Siol

Vigouroux

et al. 2020

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

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“…For example, Vega‐Alvarez et al (2017) found F IS = 0.318 for Z. mays subsp. parviglumis , while Díaz et al (2020) and Rocandio‐Rodríguez et al (2014), respectively, reported F IS values of 0.33 and 0.314 for Z. mays subsp. parviglumis and 0.28 and 0.381 for Z. mays subsp.…”

Section: Discussionmentioning

confidence: 98%

The role of environment, local adaptation, and past climate fluctuation on the amount and distribution of genetic diversity in two subspecies of Mexican wild Zea mays

Gasca-Pineda

Gutiérrez-Guerrero

Aguirre‐Planter

et al. 2020

American J of Botany

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Past climate fluctuations during the Holocene and Pleistocene shaped the distribution of several plant species in temperate areas over the world. Wild maize, commonly known as teosinte, is a good system to evaluate the effects of historical climate fluctuations on genetic diversity due to its wide distribution in Mexico with contrasting environmental conditions. We explored the influence of contemporary factors and historical environmental shifts on genetic diversity, including present and three historical periods using neutral markers. METHODS: We used 22 nuclear microsatellite loci to examine the genetic diversity of 14 populations of Zea mays subsp. parviglumis and 15 populations of Zea mays subsp. mexicana (527 individuals total). We implemented genetic structure analyses to evaluate genetic differentiation between and within subspecies. We applied coalescent-based demographic analysis and species distribution modeling to evaluate the effects of historical environmental shifts. RESULTS: We found 355 alleles in total for the two subspecies and variable levels of diversity in each (Z. mays subsp. parviglumis expected heterozygosity H E = 0.3646-0.7699; Z. mays subsp. mexicana H E = 0.5885-0.7671). We detected significant genetic structure among populations (D EST = 0.4332) with significant heterozygote deficiency (F IS = 0.1796), and variable selfing rates (sg 2 = 0.0-0.3090). The Bayesian assignment analysis differentiated four genetic groups. Demographic and species distribution modeling analysis suggested that environmental shifts were influential in the amount of genetic diversity. CONCLUSIONS: Our analyses suggest that the current genetic diversity in teosinte is shaped by factors such as local adaptation and genetic isolation, along with historical environmental fluctuations.

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“…mexicana . Díaz et al ( 2020 ) found that ES teosinte has a complex origin being related to both commercial maize and wild teosinte ( Z. mays subsp. mexicana and Z. mays subsp.…”

Section: Introductionmentioning

confidence: 99%

Update of environmental risk assessment conclusions and risk management recommendations of EFSA (2016) on EU teosinte

Devos¹,

Aiassa²,

Muñoz‐Guajardo³

et al. 2022

EFS2

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Teosinte, wild maize relatives originating from Mexico and Central America, emerged as a noxious agricultural weed in France and Spain. In 2016, the European Food Safety Authority (EFSA) issued a technical report that assessed the available scientific information on teosinte for its relevance for the environmental risk assessment (ERA) and risk management (RM) of genetically modified (GM) maize MON810, Bt11, 1507 and GA21 for cultivation. It was concluded that the impact of insect resistance and/or herbicide tolerance in GM teosinte hybrid progeny (potentially acquired through hybridisation between GM maize and teosinte) on target and non‐target organisms, the abiotic environment and biogeochemical cycles would be very low under EU conditions. Following a request of the European Commission, EFSA evaluated whether the ERA conclusions and RM recommendations of EFSA (2016) remain applicable, or require revision in light of new scientific evidence on teosinte that has become available since the publication of EFSA (2016). A protocol was developed to clarify the interpretation of the terms of reference of the mandate and make them operational. The assessment relied on evidence retrieved via an extensive literature search and from reports of the Competent Authorities of France and Spain, and on hearing expert testimonies. A limited collection of 18 publications of varying relevance and quality was retrieved and assessed. Based on this evidence, it is concluded that the ERA conclusions and RM recommendations of EFSA (2016) remain applicable, except those pertaining to the use of glyphosate‐based herbicides on maize GA21 which should be considered under Regulation (EC) No 1107/2009. In infested agricultural areas (especially in regions where maize MON810 is widely grown), weed management measures implemented to monitor, control and/or eradicate teosinte must remain in place, as they will contribute to further reduce the low vertical gene flow potential between GM maize and EU teosinte.

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The emergence of a new weed in maize plantations: characterization and genetic structure using microsatellite markers

Cited by 8 publications

References 37 publications

Adaptive introgression from maize has facilitated the establishment of teosinte as a noxious weed in Europe

Adaptive introgression from maize has facilitated the establishment of teosinte as a noxious weed in Europe

The role of environment, local adaptation, and past climate fluctuation on the amount and distribution of genetic diversity in two subspecies of Mexican wild Zea mays

Update of environmental risk assessment conclusions and risk management recommendations of EFSA (2016) on EU teosinte

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