First published online February 13, 2003; 10.1104/pp.102.016881
Plant Physiol, March 2003, Vol. 131, pp. 1064-1079
Nylon Filter Arrays Reveal Differential Gene Expression in
Proteoid Roots of White Lupin in Response to Phosphorus
Deficiency
Claudia
Uhde-Stone,
Kelly E.
Zinn,
Mario
Ramirez-Yáñez,
Aiguo
Li,
Carroll P.
Vance, and
Deborah L.
Allan*
Departments of Soil, Water, and Climate (C.U.-S., K.E.Z., A.L.,
D.L.A.) and Agronomy and Plant Genetics (C.U.-S., K.E.Z., M.R.-Y.,
A.L., C.P.V.), University of Minnesota, 1991 Upper Buford Circle, St.
Paul, Minnesota 55108; Centre de Investigación Sobre
Fijación de Nitrógeno, Universidad Nacional Autónoma
de México Apdo Postal 565-A, 62210 Cuernavaca Mor., Mexico
(M.R.-Y.); and United States Department of Agriculture-Agricultural
Research Service, Plant Science Research Unit, 1991 Upper Buford
Circle, St. Paul, Minnesota 55108 (C.P.V.)
White lupin (Lupinus albus) adapts to
phosphorus deficiency ( P) by the development of short, densely
clustered lateral roots called proteoid (or cluster) roots. In an
effort to better understand the molecular events mediating these
adaptive responses, we have isolated and sequenced 2,102 expressed
sequence tags (ESTs) from cDNA libraries prepared with RNA isolated at
different stages of proteoid root development. Determination of
overlapping regions revealed 322 contigs (redundant copy transcripts)
and 1,126 singletons (single-copy transcripts) that compile to a total
of 1,448 unique genes (unigenes). Nylon filter arrays with these 2,102 ESTs from proteoid roots were performed to evaluate global aspects of
gene expression in response to P stress. ESTs differentially
expressed in P-deficient proteoid roots compared with +P and P normal
roots include genes involved in carbon metabolism, secondary
metabolism, P scavenging and remobilization, plant hormone metabolism,
and signal transduction.
*
Corresponding author; e-mail dallan{at}soils.umn.edu; fax
612-625-2208.
© 2003 American Society of Plant Biologists
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