Teosinte crossing barrier1, a locus governing hybridization of teosinte with maize

Mulenga, Evans; Kermicle, Jerry L.

doi:10.1007/s001220100549

Cited by 74 publications

(87 citation statements)

References 12 publications

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“…While there is little empirical data to support a given model of speciation, previous work investigating introgression and gene flow substantiates our inferences of recent introgression. For example, hybridization is known to occur at least sporadically between domesticated maize and parviglumis (Wilkes 1977), and, despite genetic incompatibility factors limiting unidirectional gene flow between maize and mexicana (Evans and Kermicle 2001), the two taxa readily hybridize (Baltazar et al 2005;Ellstrand et al 2007). Allozyme data further suggest that introgression between maize and mexicana may be common (Blancas et al 2002), and some evidence suggests that introgression from mexicana may have contributed to maize domestication (Gallavotti et al 2004).…”

Section: Models Of Divergencementioning

confidence: 99%

Historical Divergence and Gene Flow in the Genus Zea

2009

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Gene flow plays a fundamental role in plant evolutionary history, yet its role in population divergence-and ultimately speciation-remains poorly understood. We investigated gene flow and the modalities of divergence in the domesticate Zea mays ssp. mays and three wild Zea taxa using sequence polymorphism data from 26 nuclear loci. We described diversity across loci and assessed evidence for adaptive and purifying selection at nonsynonymous sites. For each of three divergence events in the history of these taxa, we used approximate Bayesian simulation to estimate population sizes and divergence times and explicitly compare among alternative models of divergence. Our estimates of divergence times are surprisingly consistent with previous data from other markers and suggest rapid diversification of lineages within Zea in the last $150,000 years. We found widespread evidence of historical gene flow, including evidence for divergence in the face of gene flow. We speculate that cultivated maize may serve as a bridge for gene flow among otherwise allopatric wild taxa.

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Section: Models Of Divergencementioning

confidence: 99%

Historical Divergence and Gene Flow in the Genus Zea

2009

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“…Unusually, the flow of genes has occurred in both directions (reciprocal introgression) (Wilkes, 1977) although a number of factors tend to favor gene flow from teosinte to maize rather than from maize to teosinte (Baltazar et al, 2005). There is also evidence of a restriction to cross ability in some populations of maize x teosinte when teosinte is the female and maize the male parent and this has been linked to a teosinte gene or gene cluster known as teosinte crossing barrier1 (Tcb1) (Evans and Kermicle, 2001). The incompatibility is asymmetric, being very strong when maize is the pollen parent, but weaker when teosinte is the pollen parent (Baltazar et al, 2005;Kermicle and Evans, 2005).…”

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confidence: 99%

Phylogenetic Relationships Among Teosinte, Maize and Its Hybrids

Sharawy

Ibrahim

El-Fiky

2011

Egyptian Journal of Genetics and Cytology

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“…For example, a transgenic down-regulation of the LAT52 protein that resulted in pollen incapable of fertilization (Muschietti et al 1994) would be a good candidate. The advantages of a system based on a transgene-induced gametophytic mutant are that: (1) it theoretically can be used with any transgene and would be implemented at the time of transformation; (2) there is no requirement to cross transgene loci into a specific genetic background for this system to work, as would be the case in some proposed systems (Evans and Kermicle 2001;Stevens et al 2004); and (3) it would not be necessary to plant a pollinator with the transgenic plants in order to produce grain, because the transgenic plants shed viable (although non-transgenic) pollen. A disadvantage of this system is that transgenic plants would have to be propagated as heterozygotes, so only half of the grain produced would be transgenic.…”

Section: Potential For Use For Controlling Pollen Transmissionmentioning

confidence: 99%

“…A strategy for controlling pollen transmission using the Teosinte crossing barrier 1 (Tcb1) gene also has been proposed (Evans and Kermicle 2001). Efficient containment of pollen by detasseling plants which carry transgenes also has been demonstrated (Stevens et al 2004).…”

Section: Introductionmentioning

confidence: 99%

A wheat genomic DNA fragment reduces pollen transmission of maize transgenes by reducing pollen viability

et al. 2007

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A genomic DNA fragment from wheat carrying the Glu-1Dx5 gene has been shown to exhibit reduced pollen transmission in transgenic maize. To localize the region of the DNA fragment responsible for this reduced pollen transmission, we produced transgenic maize plants in which the wheat genomic DNA proximal to the 1Dx5 coding sequence was replaced with the maize 27 kDa c-zein promoter. Like the wheat promoter-driven Glu-1Dx5 transgene, this zein promoter-driven transgene functioned to produce 1Dx5 in maize endosperm. However, with the zein promoter-driven transgene, pollen transmission of the transgene loci was normal in most self-and cross-pollinations. We concluded that the wheat genomic DNA proximal to the wheat 1Dx5 coding sequence was required for reduced pollen transmission of the transgene in maize. In two of four transformation events of the wheat promoter-driven construct examined, pollen exhibited two morphological classes. In one class, pollen was normal in morphology and displayed average viability, and in the second, pollen was reduced in size and did not germinate on artificial media. DNA from the transgene was detectable in mature pollen from plants with reduced pollen transmission of transgene loci. To explain these observations, we hypothesize that elements within the transgene construct interfere with pollen development. We demonstrated that the wheat genomic DNA fragment can be used to control pollen transmission of an herbicide resistance transgene genetically linked to it. The wheat genomic DNA fragment may contain elements that are useful for controlling pollen transmission of transgene loci in commercial maize grain and seed production.

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Teosinte crossing barrier1, a locus governing hybridization of teosinte with maize

Cited by 74 publications

References 12 publications

Historical Divergence and Gene Flow in the Genus Zea

Historical Divergence and Gene Flow in the Genus Zea

Phylogenetic Relationships Among Teosinte, Maize and Its Hybrids

A wheat genomic DNA fragment reduces pollen transmission of maize transgenes by reducing pollen viability

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