Mechanisms underlying gravitropic and autotropic recovery in poplar
Résumé
Lodging is a major problem for herbaceous crops and young woody plants, causing significant yield losses. With climate change, the risk of severe storms during the growing season will increase. The risk of lodging will then be even greater.
Resilience is one of the strategies evolved by plants to cope with this problem. Resilience is the ability of plants to recover their structures and functions back to their reference states after disturbance. Resilience to lodging involves active movements called tropisms, i.e. a redirection of organs in the direction of or opposite to the physical stimuli. Our study focuses on gravitropism and autotropism. A fine-tuned combination of these two tropisms is required for the postural control of plants.
This relies on two perceptive abilities: i) graviperception (more exactly gravi-cline perception) for the perception of orientation with respect to gravity and ii) proprioception for the perception by the plant of its own curvature. Under the control of these perceptions, the plants activate motors that carry out movements. These motors can be differential elongation in primary growing zone and tension wood formation in secondary growing zone.
To understand resilience to lodging, we therefore study the graviperceptive and proprioceptive sensitivities (with a greater focus on the latter, less well known), and the motors of the movements related to these tropisms. In particular, we test the relevance of a universal model of postural control called the AC model (Moulia et al. 2021)
Domaines
Biologie végétale
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