Time-course growth indices (GI) of cell suspensions of three
plant species when grown singly or in combinations. (a) C. roseus (C), R.
serpentina (R) and V. major (V) alone on their respective control medium;
(b) R. serpentina and V. major cell suspension alone on Catharanthus
suspension medium; (c) Co-cultures of C. roseus cells with R. serpentina
(C+R) and V. major (C+V).