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@ARTICLE{Zhan:281231,
author = {Zhan, Ai and Schneider, Hannah and Lynch, Jonathan},
title = {{R}educed lateral root branching density improves drought
tolerance in maize},
journal = {Plant physiology},
volume = {168},
number = {4},
issn = {0032-0889},
address = {Rockville, Md.},
publisher = {Soc.},
reportid = {FZJ-2016-00930},
pages = {1603–1615},
year = {2015},
abstract = {An emerging paradigm is that root traits that reduce the
metabolic costs of soil exploration improve the acquisition
of limiting soil resources. Here we test the hypothesis that
reduced lateral root branching density will improve drought
tolerance in maize (Zea mays) by reducing the metabolic
costs of soil exploration, permitting greater axial root
elongation, greater rooting depth, and thereby greater water
acquisition from drying soil. Maize recombinant inbred lines
with contrasting lateral root number and length (FL: few but
long; MS: many but short) were grown under water stress in
greenhouse mesocosms, in field rainout shelters, and in a
second field environment with natural drought. Under water
stress in mesocosms, lines with the FL phenotype had
substantially less lateral root respiration per unit axial
root length, deeper rooting, greater leaf relative water
content, greater stomatal conductance, and $50\%$ greater
shoot biomass than lines with the MS phenotype. Under water
stress in the two field sites, lines with the FL phenotype
had deeper rooting, much lighter stem water δ18O signature
signifying deeper water capture, 51 to $67\%$ greater shoot
biomass at flowering, and $144\%$ greater yield than lines
with the MS phenotype. These results entirely support the
hypothesis that reduced lateral root branching density
improves drought tolerance. The FL lateral root phenotype
merits consideration as a selection target to improve the
drought tolerance of maize and possibly other cereal crops.},
cin = {IBG-2},
ddc = {580},
cid = {I:(DE-Juel1)IBG-2-20101118},
pnm = {582 - Plant Science (POF3-582)},
pid = {G:(DE-HGF)POF3-582},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:26077764},
UT = {WOS:000359317400036},
doi = {10.1104/pp.15.00187},
url = {https://juser.fz-juelich.de/record/281231},
}