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PLANT PHYSIOLOGY , Vol 107, Issue 1 207-213, Copyright © 1995 by American Society of Plant Biologists

WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY

Characterization of a Phosphate-Accumulator Mutant of Arabidopsis thaliana

E. Delhaize and P. J. Randall
Division of Plant Industry, Commonwealth Scientific and Industrial Research Organization, GPO Box 1600, Canberra Australian Capital Territory 2601, Australia

We have characterized a novel mutation of Arabidopsis thaliana at a locus designated pho2. pho2 mutants accumulated up to 3-fold more total P in leaves, mostly as inorganic phosphate (Pi), than wild-type seedlings. In addition, we isolated a mutant (locus designated pho1-2, an allelle of pho1-1 described by Y. Poirier, S. Thoma, C. Somerville, J. Schiefelbein [1991] Plant Physiol 97: 1087-1093) with low Pi concentrations in leaves. When grown under high transpiration conditions, leaves of pho2 seedlings became severely P intoxicated, whereas shoots of pho1-2 mutants were P deficient and wild-type seedlings were normal. A pho1/pho2 double mutant resulting from a cross between the single mutants was identified in the F2 generation and shown to have a pho1 phenotype. Prior to the development of P toxicity symptoms, P was the only mineral nutrient whose concentration was greater in pho2 mutants than wild-type seedlings. Compared to wild-type, pho2 mutants had greater Pi concentrations in stems, siliques, and seeds, but roots of pho2 mutants had similar or lower Pi concentrations than either pho1 mutants or wild-type seedlings. We suggest that the pho2 mutation affects a function normally involved in regulating the concentration of Pi in shoots of Arabidopsis.


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