Nitrate Effects on Nitrate Reductase Activity and Nitrite Reductase mRNA Levels in Maize Suspension Cultures | Zendy

Laura Privalle | Zendy; Kristi N. Lahners | Zendy; Martha A. Mullins | Zendy; Steven J. Rothstein | Zendy

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Nitrate Effects on Nitrate Reductase Activity and Nitrite Reductase mRNA Levels in Maize Suspension Cultures

Author(s) -

Laura Privalle,

Kristi N. Lahners,

Martha A. Mullins,

Steven J. Rothstein

Publication year - 1989

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.90.3.962

Subject(s) - nitrate reductase , cycloheximide , nitrate , nitrite reductase , chlorate , nitrite , chemistry , biochemistry , perchlorate , enzyme , protein biosynthesis , inorganic chemistry , ion , organic chemistry

Nitrate reductase (NR) activity and nitrite reductase (NiR) mRNA levels were monitored in Black Mexican Sweet maize (Zea mays L.) suspension cultures after the addition of nitrate. Maximal induction occurred with 20 millimolar nitrate and within 2 hours. Both NR and NiR mRNA were transiently induced with levels decreasing after the 2 hours despite the continued presence of nitrate in the medium. Neither ammonia nor chlorate prevented the induction of NR. Furthermore, removal of nitrate, followed by its readdition 22 to 48 hours later, did not result in reinduction of activity or message. NR was synthesized de novo, since cycloheximide completely blocked its induction. Cycloheximide had no effect on the induction of NiR mRNA or on the transient nature of its induction. These results are similar to those reported previously for maize seedlings.

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