Characterization of an Isolate of Phytophthora Nicotianae Var. Nicotianae From North Queensland

Abstract

An isolate of P. nicotianae var. nicotianae from North Queensland was shown to be of pathogenic race 0, since it was non-pathogenic to Nicotiana longifiora and N. plumbaginifolia, but was strongly pathogenic to N. rustica and N. tabacum. The pH optimum, the pH-growth response curve, the temperature optima for growth on various media, and growth in the presence of sterol were similar to those reported previously for isolates from America.The utilization of sugars and amino acids by the Australian isolate was compared with that reported for isolates from other sources. The difficulties of evaluating such comparisons and the need for conducting such investigations under precisely defined conditions are discussed.