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Identification of cDNA clones corresponding to two inducible nitrate reductase genes in soybean: analysis in wild-type and nr1 mutant

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Abstract

Among higher plants, soybean is unique in that biochemically it has been characterized as having two constitutive nitrate reductase (cNR) isoforms and one substrate-inducible nitrate reductase (iNR) isoform in leaves. All three NR isoforms are expressed in cv. Williams 82 while the nr1 mutant expresses only the iNR isoform. The genetic and molecular mechanisms for regulation of these isoforms have not been elucidated. We describe here the isolation, by reverse transcription-polymerase chain reaction (RT-PCR), of two cDNA clones encoding soybean NR. They were designated as iNR1 and iNR2, respectively, since both were inducible by nitrate. The iNR1 and iNR2 cDNAs cover total encoding regions of 2661 and 2673 nucleotides, respectively. The iNR1 clone shows a 12 bp deletion at the 5′ end, relative to iNR2. They show overall similarity of 89% at the nucleotide level, and 87% at the amino acid level. Like all plant NRs cloned so far, deduced acid sequences between iNR1 and iNR2 show greatest variation at the N-terminal region while no difference was observed at the C-terminus. Soybean iNR mRNAs were found to be different from those of maize and tobacco in response to tungsten inhibitor treatment, since the inhibitor decreased the steady-state levels of mRNA for soybean iNR and for NiR. Using the same 5′ regions of both cDNAs as the probes, Southern blot analysis of genomic DNA revealed differences in organization between iNR1 and iNR2. The genomic DNA from wild-type Williams 82 soybean was shown to have three Eco RI fragments while the nr1 mutant lacked an 8 kb fragment when probed with iNR1 cDNA. Likewise, the nr1 mutant lacked three Hae III restriction fragments when probed with iNR1 cDNA. When probed with iNR2, both wildtype and nr1 mutant showed one identical Eco RI band and two identical Hae III bands. In northern blots, the steady-state level of iNR1 mRNA was similar for the nr1 mutant and the wild-type parent after 20 to 48 h induction by nitrate. Based on the Eco RI and Hae III restriction enzyme digestion patterns observed in Southern blot analysis of soybean DNA, it is concluded that in soybean iNR1 is encoded by a small multiple gene family and iNR2 is a single gene.

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Author notes

  1. Shenchuan Wu & Win Lu

    Present address: N514 Doan Hall, OSU Hospital, 410 W. Tenth Avenue, 43210, Columbus, OH, USA

Authors and Affiliations

  1. Department of Agronomy, University of Illinois, 1201 W. Gregory

    Shenchuan Wu, Alan L. Kriz & James E. Harper

  2. Plant Physiology and Genetics Research Unit, USDA/ARS, 1201 W. Gregory, 61801, Urbana, IL, USA

    Shenchuan Wu & James E. Harper

  3. Biotechnology Center, Ohio State University, 43210, Columbus, OH, USA

    Win Lu

  4. DeKalb Plant Genetics, 62 Maritime Drive, 06355, Mystic, CT, USA

    Alan L. Kriz

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  1. Shenchuan Wu
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  2. Win Lu
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  3. Alan L. Kriz
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  4. James E. Harper
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Trade and manufacturers' names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by USDA implies no approval of the product to the exclusion of others that may also be suitable.

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Wu, S., Lu, W., Kriz, A.L. et al. Identification of cDNA clones corresponding to two inducible nitrate reductase genes in soybean: analysis in wild-type and nr1 mutant. Plant Mol Biol 29, 491–506 (1995). https://doi.org/10.1007/BF00020980

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  • DOI: https://doi.org/10.1007/BF00020980

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