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http://dx.doi.org/10.5010/JPB.2009.36.1.087

Iron fortification of grains by introducing a recombinant gene of ferritin with seed promoters in rice  

Cho, Yong-Gu (Department of Crop Science, Chungbuk National University)
Kim, Hyung-Keun (Department of Crop Science, Chungbuk National University)
Choi, Jang-Sun (Department of Horticulture, Hankyong National University)
Jung, Yu-Jin (Department of Horticulture, Hankyong National University)
Kang, Kwon-Kyoo (Department of Horticulture, Hankyong National University)
Publication Information
Journal of Plant Biotechnology / v.36, no.1, 2009 , pp. 87-95 More about this Journal
Abstract
The recombinant DNAs, pGBF, pGTF, and pZ4F, using soybean ferritin gene have constructed with the promoters derived from seed proteins, glutelin, globulin, and zein. The recombinant ferritin genes were transformed into rice plant by Agrobacterium-mediated transformation. Iron contents and agronomic traits have been evaluated in the transgenic progenies. The embryogenic calli survived from second selection medium were regenerated at the rates of 19.2% with pGBF, 15.0% with pGTF, and 18.4% with pZ4F in Donganbyeo and 6.7% with pGBF, 11.7% with pGTF, and 3.4% with pZ4F in Hwashinbyeo. The introduction of ferritin gene in putative transgenic rice plants was confirmed by PCR and Southern blot analysis and also the expression of ferritin gene was identified by Northern blot and Western blot analysis. The iron accumulation in transgenic rice grains of the transgenic rice plant, T1-2, with zein promoter and ferritin gene contained 171.4 ppm showing 6.4 times higher than 26.7 ppm of Hwashinbyeo seed as wild type rice, but the transgenic plants with globulin and glutelin showed a bit higher iron contents with a range from 2.1 to 3.0 times compare to wild type grain. The growth responses of transgenic plants showed the large variances in plant height and number of tillers. However, there were some transgenic plants having similar phenotype to wild type plants. In the T1 generation of transgenic plants, plant height, culm length, panicle length, and number of tillers were similar to those of wild type plants, but ripened grain ratio ranged from 53.3% to 82.2% with relatively high variation. The transgenic rice plants would be useful for developing rice varieties with high iron content in rice grains.
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