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Two stories about hormone perception: a novel mechanism and an unknown auxin

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Thursday 27 October 2016, 14:00 - 15:30


Our work with the high shoot branching ramosus (rms) pea mutants led to a model where two long distance signals, graft-transmissible, were involved: a root-to-shoot signal acting as a branching inhibitor, now known as strigolactones (SL) and a shoot-to-root feedback signal, RMS2-dependent, controlling both SL biosynthesis and cytokinin level in the xylem sap.

The first part of the talk will show how the use of profluorescent probes with strigolactone-like bioactivity revealed an undescribed mechanism of plant hormone reception where the receptor itself performs an irreversible enzymatic reaction to generate its own ligand. In a second part, we will discuss the nature of the feedback signal that was investigated by cloning the pea RMS2 gene. RMS2 encodes the pea ortholog of the Arabidopsis auxin receptor belonging to the AUXIN-SIGNALING F-BOX4 (AFB4)/AFB5 clade, suggesting that the shoot-to-root feedback signal is very likely IAA. Other data indicate that this clade of auxin receptors mediate the response to an unknown auxin.

Location Jozef Schell seminar room
Contact Prof Catherine RAMEAU
Institut Jean-Pierre Bourgin
INRA Centre de Versailles-Grignon