Dr. Dave Hubbell suggests that folks interested in the macromolecule absorption by plants refer back to the old classic text, _Ecology of Soil- Borne Plant Pathogens, Prelude to Biological Control,_ edited by K. F. Baker and W. C. Snyder. Second printing was in 1970. Refer specifically to pages 156-157, 167 - pectinase, 168, 199 and 248. Regards. Ken Buhr Agronomy, U of Florida klb@gnv.ifas.ufl.edu