Previous View
APSnet Home
Phytopathology Home


Studies on Biosynthesis of Phaseollin in Excised Pods of Phaseolus vulgaris. Samuel L. Hess, NDEA Fellow, Department of Plant Pathology, Washington State University, Pullman 99163; Lee A. Hadwiger(2), and Martin E. Schwochau(3). (2)(3)Associate Professor, and Research Associate, respectively, Department of Plant Pathology, Washington State University, Pullman 99163. Phytopathology 61:79-82. Accepted for publication 11 August 1970. DOI: 10.1094/Phyto-61-79.

Based on the incorporation of phenylalanine-ul-14C, cinnamic acid-carboxyl-14C, acetate-1-14C, and daidzein-ul-3H into phaseollin, a general biosynthetic pathway for this isoflavonoid in Phaseolus vulgaris L. is suggested. Mevalonic acid-2-14C did not appear to be incorporated, suggesting that it is not a precursor of phaseollin. Stimulation of phenylalanine ammonia-lyase (PAL) activity occurs before phaseollin can be detected in the pod tissue. The level of increased PAL activity is not always proportional to the amount of phaseollin produced.

Additional keywords: phytoalexin, isoflavonoid, Fusarium solani f. sp. phaseoli, F. solani f. sp. pisi.