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PLANT PHYSIOLOGY , Vol 114, Issue 1 137-144, Copyright © 1997 by American Society of Plant Biologists

WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY

NO3- and ClO3- Fluxes in the chl1-5 Mutant of Arabidopsis thaliana (Does the CHL1-5 Gene Encode a Low-Affinity NO3- Transporter?)

B. Touraine and ADM. Glass
Laboratoire de Biochimie et Physiologie Moleculaire des Plantes, Ecole Nationale Superieure Agronomique de Montpellier (ENSAM), Institut National de la Recherche Agronomique, Centre National de la Recherche Scientifique, Unite de Recherche Associee 2133, 34060 Montpellier Cedex 1, France (B.T.)

The CHL1 gene is considered to encode a low-affinity transport system (LATS) for NO3- in Arabidopsis thaliana (Y.-F. Tsay, J.I. Schroeder, K.A. Feldmann, N.M. Crawford [1993] Cell 72: 705-713). However, the anticipated reduced NO3- uptake by the LATS associated with loss of CHL1 gene activity in chl1-5 deletion mutants was evident only when plants were grown on NH4NO3. When KNO3 was the sole N source, NO3- accumulation and short-term tracer influx (using 13NO3- and 15NO3-) in leaves and roots of wild-type and mutant plants were essentially identical. Nevertheless, root uptake of 36ClO3- by the LATS and ClO3- accumulation in roots and shoots of mutant plants were significantly lower than in wild-type plants when grown on KNO3. One explanation for these results is that a second LATS is able to compensate for the chl1-5 deficiency in KNO3-grown plants. Growth on NH4NO3 may down-regulate the second LATS enough that the anticipated difference in NO3- uptake becomes apparent.


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