Isolation and characterization of a novel Arabidopsis thaliana mutant that shows low nitrate concentration in shoots(Plant Nutrition)

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A novel Arabidopsis thaliana mutant that shows a low concentration of nitrate in shoots was isolated from an ethyl-methanesulfonate-mutagenized M_2 population. In the mutant, the nitrate concentration in the shoots was reduced to 45-61% of that in the wild-type plants when plants were grown hydroponically at a different range of external nitrate. When grown in solid media containing 5mmol L^<-1> nitrate, the fresh weights of shoots and roots in the mutant were approximately 62% and 67%, respectively, compared with those of the wild type. The mutant did not show any difference in in vitro nitrate reductase activity from wild-type plants and net nitrate uptake in the mutant was 22% lower than that in wild-type plants. Genetic mapping analysis revealed that the mutation was mapped near the bottom of chromosome 1.
社団法人日本土壌肥料学会の論文