Immature soybean cotyledons grow well in aseptic in vitro culture (Ann. Bot. 41: 29, 1977). The effect of adding methionine to a sulfuradequate medium was tested . Methionine caused a dry weight increase of 23%. Methionine also raised the methionine content of the protein by 22% and decreased the arginine content by 11 %.
Holowach, L. P.; Madison, J. T.; Beachy, R. N.; and Thompson, J. F.
"Research Notes : The effect of added methionine on the growth and protein composition of soybean on cotyledons,"
Soybean Genetics Newsletter: Vol. 7
, Article 29.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol7/iss1/29