Abstract: The changes of protein components of plasma membranes and plasma - membrane - depleted vesicles from the roots of tomato seedlings under phosphate starvation were studied in this paper. Firstly, the results revealed that, under phosphate starvation for 7 days, the contents of proteins of plasma membranes and plasma - membrane - depleted vesicles from the roots of tomato seedlings approximated to those of their unstressed controls respectively. Secondly, the results from SDS- PAGE of proteins showed that there were four novel polypeptides (mw: 34 kD, 36 kD, 46 kD, 49 kD) which existed in the plasma membranes from the roots of tomato seedlings under phosphate starvation for 7 days but not in those of controls. The above -mentioned results of SDS - PAGE were further confirmed by CG - PAGE.

Key words: Tomato(Lycopersicon esculentum)