The developmental and environmental regulation of gravitropic setpoint angle in Arabidopsis and bean

Root and shoot branches are major determinants of plant form and critical for the effective capture of resources below and above ground. These branches are often maintained at specific angles with respect to gravity, known as gravitropic set point angles (GSAs). We have previously shown that the mec...

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Bibliographic Details
Published in:Scientific reports 2017-03, Vol.7 (1), p.42664-42664, Article 42664
Main Authors: Roychoudhry, Suruchi, Kieffer, Martin, Del Bianco, Marta, Liao, Che-Yang, Weijers, Dolf, Kepinski, Stefan
Format: Article
Language:English
Subjects:
14/19
38/39
631/449/1741/1576
631/449/1975
631/449/2653/1359
64
96
Arabidopsis - physiology
Biochemie
Biochemistry
Environment
EPS
Gravitropism
Humanities and Social Sciences
Indoleacetic Acids - metabolism
Indoleacetic Acids - pharmacology
Light
multidisciplinary
Nitrates - metabolism
Phosphates - metabolism
Plant Development
Plant Roots - physiology
Science
Temperature
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Summary:Root and shoot branches are major determinants of plant form and critical for the effective capture of resources below and above ground. These branches are often maintained at specific angles with respect to gravity, known as gravitropic set point angles (GSAs). We have previously shown that the mechanism permitting the maintenance of non-vertical GSAs is highly auxin-dependent and here we investigate the developmental and environmental regulation of root and shoot branch GSA. We show that nitrogen and phosphorous deficiency have opposing, auxin signalling-dependent effects on lateral root GSA in Arabidopsis: while low nitrate induces less vertical lateral root GSA, phosphate deficiency results in a more vertical lateral root growth angle, a finding that contrasts with the previously reported growth angle response of bean adventitious roots. We find that this root-class-specific discrepancy in GSA response to low phosphorus is mirrored by similar differences in growth angle response to auxin treatment between these root types. Finally we show that both shaded, low red/far-red light conditions and high temperature induce more vertical growth in Arabidopsis shoot branches. We discuss the significance of these findings in the context of efforts to improve crop performance via the manipulation of root and shoot branch growth angle.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep42664