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Plant Physiol, December 2000, Vol. 124, pp. 1786-1799
Analysis of Phosphate Acquisition Efficiency in Different
Arabidopsis Accessions
Ram A.
Narang,
Asja
Bruene, and
Thomas
Altmann*
Max-Planck-Institut für Molekulare Pflanzenphysiologie,
Department Willmitzer, Am Mühlenberg 1, 14476 Golm,
Germany
The morphological and physiological characteristics of Arabidopsis
accessions differing in their phosphate acquisition efficiencies (PAEs)
when grown on a sparingly soluble phosphate source (hydroxylapatite) were analyzed. A set of 36 accessions was subjected to an initial PAE
evaluation following cultivation on synthetic, agarose-solidified media
containing potassium phosphate (soluble) or hydroxylapatite (sparingly
soluble). From the five most divergent accessions identified in this
way, C24, Co, and Cal
exhibited high PAEs, whereas Col-0 and Te
exhibited low PAEs. These five accessions were analyzed in detail.
Significant differences were found in root morphology, phosphate uptake
kinetics, organic acid release, rhizosphere acidification, and the
ability of roots to penetrate substrates. Long root hairs at high
densities, high uptake per unit root length, and high substrate
penetration ability in the efficient accessions C24 and
Co mediate their high PAEs. The third accession with
high PAE, Cal, exhibits a high shoot-to-root ratio, long
roots with long root hairs, and rhizosphere acidification. These
results are consistent with previous observations and highlight the
suitability of using Arabidopsis accessions to identify and isolate
genes determining the PAE in plants.
*
Corresponding author; e-mail altmann{at}mpimp-golm.mpg.de; fax
49-331-567-8250.
© 2000 American Society of Plant Physiologists
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