Hormones, nutrients and development

Group leader : Benoît Lacombe
Senior Scientist CNRS
Phone : +33 4 99 61 25 18
Mail : benoit.lacombe@supagro.fr

Key words

nutrients-hormones interaction, nutrients sensing, long-distance signaling, systems biology, machine   learning

Presentation

The mineral nutrition of most terrestrial organisms (bacteria, fungi, plants) relies on the uptake of inorganic ions from the soil. However, the availability of these ions dramatically fluctuates in both time and space. To face this constraint, all organisms are able to develop a wide range of adaptive responses triggered by sensing systems that perceive the external nutrient availability. The identification of these sensing systems has a strategic importance at both fundamental and applied levels to unravel and manipulate the molecular mechanisms involved in tolerance to nutrient stress. Flexible modulation of the postembryonic organogenesis in response to nutrient availability is one of the most prominent adaptation strategies, and a major determinant of the plant body architecture. This plant ability to respond to environmental conditions is mediated through signalling molecules called plant hormones. Thus, the current insights into hormone and nutrition interplay indicate existence of complex network in which hormones act as endogenous mediators in response to nutrient fluctuation and at the same time fine tune plant capacity for nutrient acquisition. The current data support the concept of nutrient – hormonal regulatory network control plant behavior in response to fluctuating nitrogen environments and feedback on the nutrition acquisition capacity. Together with the influence of nitrogen on hormonal status of the plant this builds the conceptual cycle where nutrients control growth, which in turn control nutrient use and perception. However, molecular mechanisms underlying this nutrient – hormones regulated plant development are still scarcely understood. We develop complementary approaches to understand the molecular basis of development regulated by the hormone-nutrient interactions (nitrate and urea). We focus on interactions during root development with different approaches taking advantage of our skills in biophysics, molecular and cellular biology, physiology and systems biology. The project uses an approach at the interface between biology and modeling to reveal the molecular mechanisms involved in the interaction between nutritional and hormonal signals in plants. Our goal is to identify the mechanisms through which plants perceive their mineral environment and modify their development to adapt to nutritional constraints by using complementary approaches: targeted approaches on different nitrate, auxin, ABA and cytokinins transporters, and approaches without preconceptions using systems biology.

Team members

Permanent staff

Benoît Lacombe
Group leader
Research Director
CNRS

Anna Medici
Associate Professor
SupAgro

Gabriel Krouk
Research Associate
CNRS

Hatem Rouached
Research Associate
INRA

Sandrine Ruffel
Research Associate
INRA

Wojciech Szponarski
Research Engineer
INRA

Chantal Brachet
Technician
INRA

Virginie Thiry
Technician
SupAgro

Main results
Significant publications

 

Corratgé-Faillie C, Lacombe B✉ (2017) Substrate (un)specificity of Arabidopsis NRT1/PTR FAMILY (NPF) proteins. J. Exp. Bot., 68(12):3107-3113

Secco D✉, Whelan J, Rouached H, Lister R (2017) Nutrient stress-induced chromatin changes in plants. Curr. Opin. Plant Biol., 39:1-7

Ruffel S✉, Gojon A✉ (2017) Systemic nutrient signalling: On the road for nitrate. Nature Plants, 3:17040

Lacombe B, Achard P✉ (2016) Long-distance transport of phytohormones through the plant vascular system. Curr. Opin. Plant Biol., 34:1-8

Ristova D, Carré C, Pervent M, Medici A, Kim GJ, Scalia D, Ruffel S, Birnbaum KD, Lacombe B, Busch W, Coruzzi GM, Krouk G✉ (2016) Combinatorial interaction network of transcriptomic and phenotypic responses to nitrogen and hormones in the Arabidopsis thaliana root. Sci. Signal., 9(451):rs13

Noguéro M, Lacombe B✉ (2016) Transporters involved in root nitrate uptake and sensing by Arabidopsis. Front. Plant Sci., 7:1391

Krouk G✉ (2016) Hormones and nitrate: a two-way connection. Plant Mol. Biol., 91(6):599-606

Ruffel S✉, Poitout A, Krouk G, Coruzzi GM, Lacombe B (2016) Long-distance nitrate signaling displays cytokinin dependent and independent branches. J. Integr. Plant Biol., 58(3):226-229

Former team members

IBIP seminar : Ivan Baxter

Thursday december 12, 2019. Mind the GxE=P; elemental content in plants

A publication of the HoNuDe team ranked # 1 at Top5 Altmetrics for The Plant Cell (mid March 2019)!

Identification of molecular integrators shows that nitrogen actively controls the phosphate starvation response in plantsAnna Medici*✉, Wojciech Szponarski*, Pierre Dangeville, Alaeddine Safi, Indeewari Madhubhashini Dissanayake, Chorpet Saenchai, Amélie Emanuel, Vicente Rubio, Benoît Lacombe, Sandrine Ruffel, Milos Tanurdzic, Hatem Rouached, Gabriel Krouk✉ Plant Cell (Mars 2019)

IPSB2018

Sep 10-14, 2018 – First international plant systems biology meeting – Roscoff – Chair: Gabriel Krouk (CNRS, B&PMP)

IPMB2018

Aug 5-10, 2018 – 12th Congress of the International Plant Molecular Biology – Montpellier – Chair: Benoît Lacombe

Thesis defended by Alaeddine Safi

March 27, 2018 – Study of transcription factors involved in nitrogen / nitrate signaling

Thesis defended by Mushtak Kisko

March 8, 2018 – Study of the physiological and molecular mechanisms of co-regulation of phosphate and zinc homeostasis in plants

eLife 2018

Kisko M, Bouain N, Safi A, Medici A, Akkers RC, Secco D, Fouret G, Krouk G, Aarts MGM, Busch W, Rouached H✉ (2018) LPCAT1 controls phosphate homeostasis in a zinc-dependent manner. eLife, 7:e32077

Thesis defended by Arthur Poitout

Nov. 17, 2017 – Molecular basis of nitrate/cytokinin-dependent long-distance signaling in Arabidopsis thaliana

How humans and their gut microbes may respond to plant hormones

Aug. 22, 2017 – CellPress press release – Plant hormones: key players in gut microbiota and human diseases?

HDR defended by David Secco

May 22, 2017 – Identification et caractérisation de réseaux de gènes impliqués dans la réponse des plantes aux carences combinées en éléments nutritifs