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

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Version: Final published version
License: CC BY-NC-ND 4.0
Serval ID
serval:BIB_4C004C061297
Type
Article: article from journal or magazin.
Collection
Publications
Title
Changes in resource partitioning between and within organs support growth adjustment to neighbor proximity in <i>Brassicaceae</i> seedlings.
Journal
Proceedings of the National Academy of Sciences of the United States of America
Author(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
Publication state
Published
Issued date
16/10/2018
Peer-reviewed
Oui
Volume
115
Number
42
Pages
E9953-E9961
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
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.
Keywords
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
Yes
Create date
16/10/2018 12:23
Last modification date
20/08/2019 15:00
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