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A main scientific progress: MiMe, mitosis instead of meiosis

MiMe is a new plant line producing pollen grains and ovules genetically identical to the parent plant. It represents a potentially revolutionary technology for plant breeding. Isabelle d'Erfurth and Raphaël Mercier, is scientific director from the “Méiose et recombinaison” team, presented their work at the “séance publique de l'Académie des science” on June 8th 2010. This presentation gathered the six 2009-2010 main progresses in biology published in top rank scientific reviews.

In plants, animals and fungi, meiosis, a special type of cell division, allows production of sexual cells, i.e. gametes (pollen and ovules). During meiosis, the number of chromosomes is halved. Mating of two gametes, the pollination, will restore in the next generation the initial number of chromosomes. The progeny resulting from mating will possess an original set of chromosomes coming half from each of its parents. The other sort of division, essential for the development of individuals is the mitosis generating perfectly identical cells to the mother cell. In the model plant Arabidopsis thaliana, Isabelle d’Erfurth and the “Méiose et recombinaison“ team have obtained a plant line in which meiosis is replaced by mitosis. The gametes produced by these plants possess the complete exact copy of the genomes of their parents.

MiMe, a major step towards apomixis: asexual clonal reproduction through seeds. Apomixis is a specific type of reproduction observed in more than 400 species of wild flowering plants, but it is exceptional in economically important crops. Until now, apomixis is not introduced in sexed plants; we are closer to it thanks to this work. To obtain apomictic plants is the detective story of the English novel "Day of the Dandelion ". The apomictic reproduction of a cultivated species would be an extremely efficient means of obtaining and propagating new elite varieties to meet the needs of consumers and producers.
These results are associated to an INRA patent and projects on cultivated plants are currently developed.

More information:
MIME, a plant line producing pollen grains and ovules that are genetically identical to the parent plant, Press Info item INRA , 05/08/2009

Plant genetics: Asexual Arabidopsis Nature 2009 459(7249): 892. doi:10.1038/459892e
Journal club Baumann P. Nature 2009 462(7273): 547. doi:10.1038/462547e
Sexual gene shuffling suppressed in plants Ledford H. Nature 2009. doi:10.1038/news.2009.554
In Brief Nature Reviews Genetics 2009 10(7): 427. doi:10.1038/nrg2629

References:
Isabelle d'Erfurth et al. (2009) Turning Meiosis into Mitosis. PLoS BIOLOGY
Isabelle d'Erfurth, Laurence Cromer et al. (2010) The CYCLIN-A CYCA1;2/TAM Is Required for the Meiosis I to Meiosis II Transition and Cooperates with OSD1 for the Prophase to First Meiotic Division Transition. PLoS GENETICS


Associated patent:
Plants producing 2N gametes or apomictic gametes. N° EP 09 290 010.9. 7 janvier 2009

June 2010


Symposium "Polyploidy and cytogenetics"
May 17th and 18th 2010, Versailles, INRA, France

This annual meeting aims to promote exchanges between French scientists interested in polyploidy and/or cytogenetics. Regular support from GAP is ackwoledged as well as the presence of scientists from EU.

 


Programme (file) Organizers :
Eric Jenczewski (IJPB)
Olivier Coriton (INRA, Rennes)
Local commitee :
Liudmila Chelysheva ((IJPB)
Daniel Vezon (IJPB)
   

 

may 2010


News records : 2012 - 2011 - 2010 - 2009 - 2008 - 2007 - 2006 - 2005 - 2004 - 2003

 


© INRA 2010
home IJPB

Institut Jean-Pierre Bourgin
  presentation
  access
  management
  job opportunities
  teaching resources
  publications
  contact
  Morphogenesis, Signaling, Modeling
  Dynamics and Expression of plant Genomes
  Adaptation of Plants to the Environment
  Reproduction and Seeds
b
  Plant cell wall, function and utilization
  cytology and cell imaging
  biochemistry
  plant chemistry
  phenotyping Arabidopsis
  resources Arabidopsis
  resources Brachypodium
  administrative team
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IJPB
blanc msm blanc deg blanc ape blancrg blancrg
blanc iNRA
présentation pôles laboratoires communs services communs intranet liens actualité


top

A main scientific progress: MiMe, mitosis instead of meiosis

MiMe is a new plant line producing pollen grains and ovules genetically identical to the parent plant. It represents a potentially revolutionary technology for plant breeding. Isabelle d'Erfurth and Raphaël Mercier, is scientific director from the “Méiose et recombinaison” team, presented their work at the “séance publique de l'Académie des science” on June 8th 2010. This presentation gathered the six 2009-2010 main progresses in biology published in top rank scientific reviews.

In plants, animals and fungi, meiosis, a special type of cell division, allows production of sexual cells, i.e. gametes (pollen and ovules). During meiosis, the number of chromosomes is halved. Mating of two gametes, the pollination, will restore in the next generation the initial number of chromosomes. The progeny resulting from mating will possess an original set of chromosomes coming half from each of its parents. The other sort of division, essential for the development of individuals is the mitosis generating perfectly identical cells to the mother cell. In the model plant Arabidopsis thaliana, Isabelle d’Erfurth and the “Méiose et recombinaison“ team have obtained a plant line in which meiosis is replaced by mitosis. The gametes produced by these plants possess the complete exact copy of the genomes of their parents.

MiMe, a major step towards apomixis: asexual clonal reproduction through seeds. Apomixis is a specific type of reproduction observed in more than 400 species of wild flowering plants, but it is exceptional in economically important crops. Until now, apomixis is not introduced in sexed plants; we are closer to it thanks to this work. To obtain apomictic plants is the detective story of the English novel "Day of the Dandelion ". The apomictic reproduction of a cultivated species would be an extremely efficient means of obtaining and propagating new elite varieties to meet the needs of consumers and producers.
These results are associated to an INRA patent and projects on cultivated plants are currently developed.

More information:
MIME, a plant line producing pollen grains and ovules that are genetically identical to the parent plant, Press Info item INRA , 05/08/2009

Plant genetics: Asexual Arabidopsis Nature 2009 459(7249): 892. doi:10.1038/459892e
Journal club Baumann P. Nature 2009 462(7273): 547. doi:10.1038/462547e
Sexual gene shuffling suppressed in plants Ledford H. Nature 2009. doi:10.1038/news.2009.554
In Brief Nature Reviews Genetics 2009 10(7): 427. doi:10.1038/nrg2629

References:
Isabelle d'Erfurth et al. (2009) Turning Meiosis into Mitosis. PLoS BIOLOGY
Isabelle d'Erfurth, Laurence Cromer et al. (2010) The CYCLIN-A CYCA1;2/TAM Is Required for the Meiosis I to Meiosis II Transition and Cooperates with OSD1 for the Prophase to First Meiotic Division Transition. PLoS GENETICS


Associated patent:
Plants producing 2N gametes or apomictic gametes. N° EP 09 290 010.9. 7 janvier 2009

June 2010


Symposium "Polyploidy and cytogenetics"
May 17th and 18th 2010, Versailles, INRA, France

This annual meeting aims to promote exchanges between French scientists interested in polyploidy and/or cytogenetics. Regular support from GAP is ackwoledged as well as the presence of scientists from EU.

 


Programme (file) Organizers :
Eric Jenczewski (IJPB)
Olivier Coriton (INRA, Rennes)
Local commitee :
Liudmila Chelysheva ((IJPB)
Daniel Vezon (IJPB)
   

 

may 2010


News records : 2012 - 2011 - 2010 - 2009 - 2008 - 2007 - 2006 - 2005 - 2004 - 2003

 


© INRA 2010
home IJPB