|Morphogenesis, Signaling, Modeling|
|Dynamics and Expression of plant Genomes|
|Adaptation of Plants to the Environment|
|Reproduction and Seeds|
|Plant cell wall, function and utilization|
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.
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.
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.
© INRA 2010