Abstract
Four nitrate non-utilizing clones of Hyoscyamus muticus, obtained by a total isolation method, possess all the known characteristics of cnx-type nitrate-reductase-deficient variants: 1) strict dependence on a reduced nitrogen source such as a mixture of amino acids; 2) chlorate resistance; 3) normal nitrate uptake; 4) lack of nitrate-reductase and xanthine-dehydrogenase activities, but presence of cytochrome-c-reductase and nitrite-reductase activities; 5) in vitro nitrate-reductase complementation with a molybdenum cofactor source. Two of the clones (MA-2 and I2D12) are molybdate repairable in vivo, whilst the other two clones (VIC2 and XIVE9) are not.
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Abbreviations
- CCR:
-
cytochrome-c reductase
- Mo-Co:
-
molybdenum cofactor
- MVH:
-
reduced methylviologen
- NiR:
-
nitrite reductase
- NR:
-
nitrate reductase
- XDH:
-
xanthine dehydrogenase
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Fankhauser, H., Bucher, F. & King, P.J. Isolation of biochemical mutants using haploid mesophyll protosplasts of Hyoscyamus muticus . Planta 160, 415–421 (1984). https://doi.org/10.1007/BF00429757
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DOI: https://doi.org/10.1007/BF00429757