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Interdependent nutrient availability and steroid hormone signals facilitate root growth plasticity

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Title Interdependent nutrient availability and steroid hormone signals facilitate root growth plasticity
 
Creator Singh, Amar Pal
Fridman, Yulia
Holland, Neta
Ackerman-Lavert, Michal
Zananiri, Rani
Jaillais, Yvon
Henn, Arnon
Savaldi-Goldstein, Sigal
 
Subject low phosphate
low iron
nutrient availability
root growth
cell elongation
brassinosteroids
BRI1
 
Description Accepted date: 4 June 2018
Plants acquire essential elements from inherently
heterogeneous soils, in which phosphate and iron
availabilities vary. Consequently, plants have developed
adaptive strategies to cope with low iron or
phosphate levels, including alternation between
root growth enhancement and attenuation. How
this adaptive response is achieved remains unclear.
Here, we found that low iron accelerates root growth
in Arabidopsis thaliana by activating brassinosteroid
signaling, whereas low-phosphate-induced high iron
accumulation inhibits it. Altered hormone signaling
intensity also modulated iron accumulation in the
root elongation and differentiation zones, constituting
a feedback response between brassinosteroid
and iron. Surprisingly, the early effect of low iron
levels on root growth depended on the brassinosteroid
receptor but was apparently hormone ligandindependent.
The brassinosteroid receptor inhibitor
BKI1, the transcription factors BES1/BZR1, and
the ferroxidase LPR1 operate at the base of this
feedback loop. Hence, shared brassinosteroid and
iron regulatory components link nutrient status
to root morphology, thereby driving the adaptive
response.
We thank M. Shenker (HUJI) and A. Eshel (TAU) for the fruitful discussions. We
also thank Y. Yin (ISU) for providing anti-BES1 antibodies; T. Asami (UTokyo)
for providing BRZ; J. Li (UM-Peking University and UMS), M. Szekeres (BRC),
B. Poppenberger (TUM), Z. Wang (Stanford), and X. Wang (Huazhong Agricultural
University) for sharing published material; the NASC collection for
providing transgenic Arabidopsis lines; and R. Fluhr, B. Horwitz, and members
of the lab for their critical review of the paper. We are grateful to Ayelet Kurtz
and Dan Eisler for their technical assistance, to Smadar Goldstein for the
graphical abstract, to the Life Sciences and Engineering Infrastructure Center
and Russell Barrie Nanotechnology Institute at the Technion. A.P.S. was supported
by the PBC Fellowship Program for Outstanding Post-doctoral Fellows
from China and India 2012/2013. This research was supported by grants from
ERC no. 3363360-APPL under FP/2007–2013 to Y.J., Israel Science Foundation
(296/13) to A.H., and the United States-Israel Binational Agricultural
Research and Development Fund (IS-BARD IS-4827-15), Israel Science Foundation
(2649/16), and Fund for Applied Research at the Technion to S.S.-G.
 
Date 2018-07-10T10:28:55Z
2018-07-10T10:28:55Z
2018
 
Type Article
 
Identifier Developmental Cell, 46(1): 59-72.e1-e4
1534-5807
http://223.31.159.10:8080/jspui/handle/123456789/873
https://www.cell.com/developmental-cell/abstract/S1534-5807(18)30456-8
https://doi.org/10.1016/j.devcel.2018.06.002
 
Language en_US
 
Format application/pdf
 
Publisher Cell Press