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PLANT PHYSIOLOGY , Vol 115, Issue 3 901-906, Copyright © 1997 by American Society of Plant Biologists
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GENE REGULATION AND MOLECULAR GENETICS |
bor1-1, an Arabidopsis thaliana Mutant That Requires a High Level of Boron
K. Noguchi, M. Yasumori, T. Imai, S. Naito, T. Matsunaga, H. Oda, H. Hayashi, M. Chino and T. Fujiwara
Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113, Japan (K.N., M.Y., H.H., M.C., T.F.)
bor1-1 (high boron requiring), an Arabidopsis thaliana mutant that requires
a high level of B, was isolated. When the B concentration in the medium was
reduced to 3 [mu]M, the expansion of rosette leaves was severely affected
in bor1-1 but not in wild-type plants. In a medium containing 30 [mu]M B
the mutant grew normally but showed female sterility, whereas the wild type
was able to set seeds. These defects of the bor1-1 mutant were not detected
with supplementation of 100 [mu]M B. In vivo concentrations of B in bor1-1
mutants were lower than those of the wild type, especially in the
inflorescence stems. Tracer experiments using 10B suggested that the mutant
has defects in uptake and/or translocation of B. The mutation was mapped on
the lower arm of chromosome 2.
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