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Fri Nov 19 12:10:01 CET 2010
Calendar Name: seminars
Scheduled for: Friday, November 19 2010, 14:00 - 15:30
Event text: Catherine Rameau
Institut Jean-Pierre Bourgin UMR1318 INRA-AgroParisTech
Centre de Versailles-Grignon
FRANCE
Details: "The use of pea and Physcomitrella patens to study the
evolution of strigolactone functions in land plants"
ABSTRACT
Strigolactones are small carotenoid derived molecules
known to be produced by plant roots and released into
the rhizosphere to play the same role of signalling the
proximity of a host root in both symbiotic and parasitic
interactions. They have been recently recognised as a
novel plant hormone controlling shoot branching.
For several years, we have been using garden pea (Pisum
sativum) and a series of high branching mutants to study
the control of axillary bud outgrowth and how
strigolactones, auxin and cytokinin interact to regulate
shoot branching.
To investigate the presence and the role of
strigolactones in a non-vascular plant, we have used the
moss Physcomitrella patens, an experimental system well
adapted to study the evolution of developmental
mechanisms in plants. Using homologous recombination, we
have obtained a knock-out mutant in the homologue of the
CAROTENOID CLEAVAGE DIOXYGENASE 8 (CCD8) gene, encoding
a strigolactone biosynthesis enzyme. The mutant
phenotype is rescued by exsudates from wild type
colonies, by exogenous supply of synthetic
strigolactones or by ectopic expression of seed plant
CCD8. Our data demonstrate P. patens produces
strigolactones which act as signalling factors
controlling both developmental and ecophysiological
processes.
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