First published online January 23, 2003; 10.1104/pp.012161
Plant Physiol, March 2003, Vol. 131, pp. 1381-1390
Regulation of Root Elongation under Phosphorus Stress Involves
Changes in Ethylene Responsiveness1
Zhong
Ma,
Tobias I.
Baskin,
Kathleen M.
Brown, and
Jonathan P.
Lynch*
Department of Horticulture, The Pennsylvania State University, 103 Tyson Building, University Park, Pennsylvania 16802 (Z.M., K.M.B.,
J.P.L.); and Division of Biological Sciences, University of Missouri,
Columbia, Missouri 65211-7400 (T.I.B.)
We characterized the growth of the primary root of
Arabidopsis under phosphorus sufficiency (1 mM phosphate)
and deficiency (1 µM phosphate), focusing on the role of
ethylene. We quantified the spatial profile of relative elongation with
a novel method based on image processing, as well as the production
rates of cortical cells, trichoblasts, and atrichoblasts. Phosphorus
deficiency moderately decreased the maximal rate of relative
elongation, shortened the growth zone, and decreased the production
rate of both epidermal cell types but not of cortical cells. Inhibiting ethylene production (with aminoethoxyvinyl-glycine) or action (with
1-methylcyclopropene) increased elongation in high phosphorus and
decreased it in low phosphorus. That these effects were specific to
ethylene was confirmed by negating the effect of inhibited ethylene
production with simultaneous treatment with an ethylene precursor
(1-aminocyclopropane-1-carboxylic acid). Under both phosphorus regimes,
ethylene regulated the maximal rate of relative elongation rather than
the size of the growth zone. In addition, inhibiting ethylene action in
high versus low phosphorus elicited opposite responses for the position
of root hair initiation and for the production rates of cortex cells
and atrichoblasts. We conclude that the root system acclimates to
phosphorus deficiency by changing the signal transduction pathway
connecting ethylene levels to growth and division.
1
This work was supported in part by Binational
Agricultural Research and Development Fund (to J.P.L. and K.M.B.), by
the U.S. Department of Agriculture/National Research Initiative (grant no. 9900632 to J.P.L. and K.M.B.), and by the National Science Foundation (award no. IBN 9817132 to T.I.B.).
*
Corresponding author: e-mail JPL4{at}psu.edu; fax
814-863-6139.
© 2003 American Society of Plant Biologists
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