A spontaneous chlorate-resistant mutant of Azospirillum brasilense Sp245 displays defects in nitrate reduction and plant root colonization |
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Authors: | Oda Steenhoudt Zhu Ping Ann Vande Broek Jos Vanderleyden |
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Institution: | F. A. Janssens Laboratory of Genetics, Katholieke Universiteit Leuven, Kard. Mercierlaan 92, 3001 Heverlee, Belgium,
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Abstract: | Azospirillum, a soil bacterium capable of colonizing plant roots, can reduce NO3-. In this work, a spontaneous chlorate-resistant mutant of Azospirillum brasilense Sp245, named Sp245chl1, was phenotypically characterized. The mutant is defective in both assimilatory and periplasmic dissimilatory nitrate reductase activity. Using the gusA reporter gene methodology, Sp245chl1 was found to be significantly affected in its ability to colonize roots of wheat and rice seedlings. |
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