The polypeptide synthesis in leaf of Panicum repens L. grown naturally in different habitats was analyzed using SDS_PAGE. Preliminary experiment indicates that the overall changes in polypeptide synthesis were relatively small, but the synthesis of a 30.6 kD polypeptide was enhanced in P. repens grown in sandy beach (salinity 1.5%～3.0 %) and that of a 130 kD polypeptide markedly decreased. However, the content of the 130 kD protein increased in P.repens grown in sandy farmlands (salinity 0.1%～0.3%), especially in water marsh (salinity 0.3%～0.5%).
