Changes in resource partitioning between and within organs support growth adjustment to neighbor proximity in <i>Brassicaceae</i> seedlings.

Détails

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Etat: Public
Version: Final published version
Licence: CC BY-NC-ND 4.0
ID Serval
serval:BIB_4C004C061297
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Changes in resource partitioning between and within organs support growth adjustment to neighbor proximity in <i>Brassicaceae</i> seedlings.
Périodique
Proceedings of the National Academy of Sciences of the United States of America
Auteur(s)
de Wit M., George G.M., Ince Y.Ç., Dankwa-Egli B., Hersch M., Zeeman S.C., Fankhauser C.
ISSN
1091-6490 (Electronic)
ISSN-L
0027-8424
Statut éditorial
Publié
Date de publication
16/10/2018
Peer-reviewed
Oui
Volume
115
Numéro
42
Pages
E9953-E9961
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
In shade-intolerant plants, the perception of proximate neighbors rapidly induces architectural changes resulting in elongated stems and reduced leaf size. Sensing and signaling steps triggering this modified growth program have been identified. However, the underlying changes in resource allocation that fuel stem growth remain poorly understood. Through <sup>14</sup> CO <sub>2</sub> pulse labeling of <i>Brassica rapa</i> seedlings, we show that perception of the neighbor detection signal, low ratio of red to far-red light (R:FR), leads to increased carbon allocation from the major site of photosynthesis (cotyledons) to the elongating hypocotyl. While carbon fixation and metabolite levels remain similar in low R:FR, partitioning to all downstream carbon pools within the hypocotyl is increased. Genetic analyses using <i>Arabidopsis thaliana</i> mutants indicate that low-R:FR-induced hypocotyl elongation requires sucrose transport from the cotyledons and is regulated by a PIF7-dependent metabolic response. Moreover, our data suggest that starch metabolism in the hypocotyl has a growth-regulatory function. The results reveal a key mechanism by which metabolic adjustments can support rapid growth adaptation to a changing environment.
Mots-clé
Arabidopsis/growth & development, Arabidopsis/metabolism, Brassicaceae/growth & development, Brassicaceae/metabolism, Carbon/metabolism, Cotyledon/growth & development, Cotyledon/metabolism, Hypocotyl/growth & development, Hypocotyl/metabolism, Light, Phytochrome, Plant Leaves/growth & development, Plant Leaves/metabolism, Seedlings/growth & development, Seedlings/metabolism, Signal Transduction, PIF7, neighbor proximity detection, phytochrome B, resource partitioning, starch
Pubmed
Web of science
Open Access
Oui
Création de la notice
16/10/2018 11:23
Dernière modification de la notice
20/08/2019 14:00
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