Molecular Bases for Sensitivity to Tubulin-Binding Herbicides in Green Foxtail

Délye, Christophe; Menchari, Yosra; Michel, Séverine; Darmency, Henri

doi:10.1104/pp.103.037432

Cited by 85 publications

(112 citation statements)

References 47 publications

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“…Herbicide-resistant foxtail millet, Setaria italica (L.) Beauv., an autogamous small grain C4 cereal, was in demand because of the lack of selective herbicides and because hand weeding had become impractical for farmers. The mutation responsible for resistance was later identified as a threonine/ isoleucine at residue 239 of the a2-tubulin gene (Délye et al, 2004). Here, we report on the impact of this a2-tubulin mutant gene on foxtail millet yield.…”

Section: Introductionmentioning

confidence: 99%

Fitness costs linked to dinitroaniline resistance mutation in Setaria

Darmency¹,

Picard²,

Wang

2011

Heredity

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A mutant Thr-239-Ileu at the a2-tubulin gene was found to confer resistance to dinitroanilines, a family of mitosisdisrupting herbicides. However, mutations affecting microtubule polymerization and cell division are expected to impact growth and reproduction, that is, the fitness of a resistant weed or the yield of a tolerant crop, although it has not been demonstrated yet. This study was designed to test this hypothesis for the growth and reproduction of nearisogenic resistant and susceptible materials that were created in F 2 and F 3 generations after a Setaria viridis x S. italica cross. Differential growth was noticeable at the very onset of seedling growth. The homozygous resistant plants, grown both in a greenhouse cabinet and in the field, were smaller and had lower 1000-grain weight and therefore a lower yield. This fitness penalty is certainly due to modified cell division kinetics. Although the presence of the mutant allele accounted for 20% yield losses, there were also measurable benefits of dinitroaniline resistance, and these benefits are discussed.

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Section: Introductionmentioning

confidence: 99%

Fitness costs linked to dinitroaniline resistance mutation in Setaria

Darmency¹,

Picard²,

Wang

2011

Heredity

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“…The positions of introns 1 and 3 are conserved in ArathTUA4, whereas only the position of the first intron is conserved in ArathTUA6 . Other class I TUA genes from maize (Montoliu et al, 1990), rice (The Institute for Genomic Research Rice Database), green foxtail (Delye et al, 2004), and pea (Pisum sativum; Brierley et al, 1995) all contain three introns. Taken together, the distinct phylogenetic relationship and gene structures among class I and class II TUA members suggest their divergence before the separation of monocot and dicot plants.…”

Section: Phylogenetic Analysis Of the Tua Familymentioning

confidence: 99%

Differential Expansion and Expression ofα- andβ-Tubulin Gene Families inPopulus

et al. 2007

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Microtubule organization is intimately associated with cellulose microfibril deposition, central to plant secondary cell wall development. We have determined that a relatively large suite of eight a-TUBULIN (TUA) and 20 b-TUBULIN (TUB) genes is expressed in the woody perennial Populus. A number of features, including gene number, a:b gene representation, amino acid changes at the C terminus, and transcript abundance in wood-forming tissue, distinguish the Populus tubulin suite from that of Arabidopsis thaliana. Five of the eight Populus TUAs are unusual in that they contain a C-terminal methionine, glutamic acid, or glutamine, instead of the more typical, and potentially regulatory, C-terminal tyrosine. Both C-terminal Y-type (TUA1) and M-type (TUA5) TUAs were highly expressed in wood-forming tissues and pollen, while the Y-type TUA6 and TUA8 were abundant only in pollen. Transcripts of the disproportionately expanded TUB family were present at comparatively low levels, with phylogenetically distinct classes predominating in xylem and pollen. When tension wood induction was used as a model system to examine changes in tubulin gene expression under conditions of augmented cellulose deposition, xylem-abundant TUA and TUB genes were up-regulated. Immunolocalization of TUA and TUB in xylem and phloem fibers of stems further supported the notion of heavy microtubule involvement during cellulose microfibril deposition in secondary walls. The high degree of sequence diversity, differential expansion, and differential regulation of Populus TUA and TUB families may confer flexibility in cell wall formation that is of adaptive significance to the woody perennial growth habit.

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“…Resistance to triazines was shown to be maternally inherited and endowed by the chloroplast psbA gene encoding the D1 protein (Darmency and Pernès 1985;). Resistance to dinitroanilines was shown to be due to a nuclear a2-tubulin gene recessive to the wild type (Wang et al 1996;Délye et al 2004;). Resistance to cyclohexanediones was due to the nuclearencoded chloroplast ACCase gene inherited as a dominant trait Délye et al 2002).…”

Section: Methodsmentioning

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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Molecular Bases for Sensitivity to Tubulin-Binding Herbicides in Green Foxtail

Cited by 85 publications

References 47 publications

Fitness costs linked to dinitroaniline resistance mutation in Setaria

Fitness costs linked to dinitroaniline resistance mutation in Setaria

Differential Expansion and Expression ofα- andβ-Tubulin Gene Families inPopulus

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

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