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Plant Physiol, June 2001, Vol. 126, pp. 875-882
Phosphate Availability Regulates Root System Architecture in
Arabidopsis1
Lisa C.
Williamson,
Sebastien P.C.P.
Ribrioux,
Alastair H.
Fitter, and
H.M. Ottoline
Leyser*
Department of Biology, University of York, Box 373, York YO10 5YW,
United Kingdom
Plant root systems are highly plastic in their development and can
adapt their architecture in response to the prevailing environmental
conditions. One important parameter is the availability of phosphate,
which is highly immobile in soil such that the arrangement of roots
within the soil will profoundly affect the ability of the plant to
acquire this essential nutrient. Consistent with this, the availability
of phosphate was found to have a marked effect on the root system
architecture of Arabidopsis. Low phosphate availability favored lateral
root growth over primary root growth, through increased lateral root
density and length, and reduced primary root growth mediated by reduced
cell elongation. The ability of the root system to respond to phosphate
availability was found to be independent of sucrose supply and auxin
signaling. In contrast, shoot phosphate status was found to influence
the root system architecture response to phosphate availability.
1
This work was supported by the Nature and
Environment Research Council and by the Biotechnology and Biological
Science Research Council of the United Kingdom.
*
Corresponding author; e-mail hmol1{at}york.ac.uk; fax
44-1904-434312.
© 2001 American Society of Plant Physiologists
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