Increased sulfur amino acids in soybean plants overexpressing the maize 15 kDa zein protein |
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Authors: | Randy D Dinkins M S Srinivasa Reddy Curtis A Meurer Bo Yan Harold Trick Françoise Thibaud-Nissen John J Finer Wayne A Parrott Glenn B Collins |
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Institution: | (1) Present address: Department of Agronomy, University of Kentucky, 40546-0091 Lexington, KY;(2) Department of Horticulture and Crop Science, Ohio Agricultural Research and Development Center, The Ohio State University, 44691-4096 Wooster, OH;(3) Department of Crop and Soil Sciences, The University of Georgia, 30602-7272 Athens, GA;(4) Department of Plant Pathology, Kansas State University, 66506-5502 Manhattan, KS, USA;(5) Present address: Department of Crop Sciences, University of Illinois, 61801 Urbana, IL, USA |
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Abstract: | Summary Four transgenic soybean Glycine max (L.) Merrill] lines were generated containing the maize 15 kDa zein protein gene using somatic embryogenic protocols. The
zein gene was inserted behind the β-phaseolin promoter for seed-specific expression. All four lines represent separate transformation
events as they were generated in different experiments at different locations. Two of the transformation events produced multiple
plants, and these produced identical Southern hybridization patterns (UKY/Z1, UKY/Z2 and UKY/Z3 from the first; and OSU/Z4,
OSU/Z8 and OSU/Z10 from the second). Molecular characterization revealed that multiple copies of the zein gene were present
in all of the transgenic lines. Immunoblot analysis confirmed the accumulation of the zein protein product in the seeds of
the UKY/Z1, UKY/Z2, UKY/Z3, OSU/Z4, OSU/Z8 and OSU/Z10 transgenic lines. However, there was no accumulation of zein protein
in the UGA/Z1 line and Northern analysis confirmed that the zein transgene was silenced in this line. It was not possible
to analyze the zein expression in the seeds of the UKY/Z4 line, as it was sterile. Amino acid analysis of the UKY and OSU
lines confirmed that there was a 12–20% increase in methionine, and 15–35% increase in cysteine content in these lines compared
to the control. There were no consistent changes in the content of the other amino acids in the transgenic lines. These results
suggest that while the increase in methionine content in these lines is modest, it is possible to increase the methionine
content without adversely affecting the protein composition of soybean. |
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Keywords: | plant transformation Glycine max nutritional quality seed storage protein methionine |
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