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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Wang, R. Crawford, N. M. |
| Description | Author Affiliation: Wang R ( Department of Biology, University of California at San Diego, La Jolla 92093-0116, USA.); |
| Abstract | Two mutations have been found in a gene (NRT2) of Arabidopsis thaliana that specifically impair constitutive, high-affinity nitrate uptake. These mutants were selected for resistance to 0.1 mM chlorate in the absence of nitrate. Progency from one of the backcrossed mutants showed no constitutive uptake of nitrate below 0.5 mM at pH 7.0 in liquid culture (that is, within 30 min of initial exposure to nitrate). All other uptake activities measured (high-affinity phosphate and sulfate uptake, inducible high-affinity nitrate uptake, and constitutive low-affinity nitrate uptake) were present or nearly normal in the backcrossed mutant. Electrophysiological analysis of individual root cells showed that the nrt2 mutant showed little response to 0.25 mM of nitrate, whereas NRT2 wild-type cells showed an initial depolarization followed by recovery. At 10 mM of nitrate both the mutant and wild-type cells displayed similar, strong electrical responses. These results indicate that NRT2 is a critical and perhaps necessary gene for constitutive, high-affinity nitrate uptake in Arabidopsis, but not for inducible, high-affinity nor constitutive, low-affinity nitrate uptake. Thus, these systems are genetically distinct. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 17 |
| Volume Number | 93 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1996-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Arabidopsis Genetics Genes, Plant Nitrates Metabolism Drug Effects Biological Transport Chlorates Pharmacology Drug Resistance Hydrogen-Ion Concentration Membrane Potentials Mutagenesis Nitrate Reductase Nitrate Reductases Phosphates Plant Roots Sulfates Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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