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@ARTICLE{Gonzalez:897428,
author = {Gonzalez, Daniel and Postma, Johannes Auke and Wissuwa,
Matthias},
title = {{C}ost-{B}enefit {A}nalysis of the {U}pland-{R}ice {R}oot
{A}rchitecture in {R}elation to {P}hosphate: 3{D}
{S}imulations {H}ighlight the {I}mportance of {S}-{T}ype
{L}ateral {R}oots for {R}educing the {P}ay-{O}ff {T}ime},
journal = {Frontiers in Functional Plant Ecology},
volume = {12},
issn = {1664-462X},
address = {Lausanne},
publisher = {Frontiers Media},
reportid = {FZJ-2021-03782},
pages = {641835},
year = {2021},
abstract = {The rice root system develops a large number of nodal roots
from which two types of lateral roots branch out, large
L-types and fine S-types, the latter being unique to the
species. All roots including S-types are covered by root
hairs. To what extent these fine structures contribute to
phosphate (P) uptake under P deficiency was investigated
using a novel 3-D root growth model that treats root hairs
as individual structures with their own Michaelis-Menten
uptake kinetics. Model simulations indicated that nodal
roots contribute most to P uptake followed by L-type lateral
roots and S-type laterals and root hairs. This is due to the
much larger root surface area of thicker nodal roots. This
thickness, however, also meant that the investment in terms
of P needed for producing nodal roots was very large.
Simulations relating P costs and time needed to recover that
cost through P uptake suggest that producing nodal roots
represents a considerable burden to a P-starved plant, with
more than 20 times longer pay-off time compared to S-type
laterals and root hairs. We estimated that the P cost of
these fine root structures is low enough to be recovered
within a day of their formation. These results expose a
dilemma in terms of optimizing root system architecture to
overcome P deficiency: P uptake could be maximized by
developing more nodal root tissue, but when P is
growth-limiting, adding more nodal root tissue represents an
inefficient use of the limiting factor P. In order to
improve adaption to P deficiency in rice breeding two
complementary strategies seem to exist: (1) decreasing the
cost or pay-off time of nodal roots and (2) increase the
biomass allocation to S-type roots and root hairs. To what
extent genotypic variation exists within the rice gene pool
for either strategy should be investigated.},
cin = {IBG-2},
ddc = {570},
cid = {I:(DE-Juel1)IBG-2-20101118},
pnm = {2171 - Biological and environmental resources for
sustainable use (POF4-217)},
pid = {G:(DE-HGF)POF4-2171},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:33777076},
UT = {WOS:000633028200001},
doi = {10.3389/fpls.2021.641835},
url = {https://juser.fz-juelich.de/record/897428},
}