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pubmed-article:9733525pubmed:abstractTextTwo yeast genes, FRE1 and FRE2 (encoding Fe(III) reductases) were placed under the control of the cauliflower mosaic virus 35S promoter and introduced into tobacco (Nicotiana tabacum L.) via Agrobacterium tumefaciens-mediated transformation. Homozygous lines containing FRE1, FRE2, or FRE1 plus FRE2 were generated. Northern-blot analyses revealed mRNA of two different sizes in FRE1 lines, whereas all FRE2 lines had mRNA only of the expected length. Fe(III) reduction, chlorophyll contents, and Fe levels were determined in transgenic and control plants under Fe-sufficient and Fe-deficient conditions. In a normal growth environment, the highest root Fe(III) reduction, 4-fold higher than in controls, occurred in the double transformant (FRE1 + FRE2). Elevated Fe(III) reduction was also observed in all FRE2 and some FRE1 lines. The increased Fe(III) reduction occurred along the entire length of the roots and on shoot sections. FRE2 and double transformants were more tolerant to Fe deficiency in hydroponic culture, as shown by higher chlorophyll and Fe concentrations in younger leaves, whereas FRE1 transformants did not differ from the controls. Overall, the beneficial effects of FRE2 were consistent, suggesting that FRE2 may be used to improve Fe efficiency in crop plants.lld:pubmed
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pubmed-article:9733525pubmed:authorpubmed-author:MartinR CRClld:pubmed
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pubmed-article:9733525pubmed:dateRevised2010-9-13lld:pubmed
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pubmed-article:9733525pubmed:articleTitleExpression of the yeast FRE genes in transgenic tobacco.lld:pubmed
pubmed-article:9733525pubmed:affiliationDepartment of Horticulture and Center for Gene Research and Biotechnology, Oregon State University, Corvallis, Oregon 97331-7304, USA.lld:pubmed
pubmed-article:9733525pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9733525pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
pubmed-article:9733525pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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