PHYSIOLOGICAL RACES OF PHYTOPHTHORA INFESTANS: A COMPARISON OF THE DIFFERENTIAL HOSTS AT THE PLANT BREEDING INSTITUTE, CAMBRIDGE, WITH THOSE OF THE SCOTTISH SOCIETY FOR RESEARCH IN PLANT BREEDING |
| |
Authors: | H W HOWARD |
| |
Institution: | Plant Breeding Institute, School of Agriculture, University of Cambridge |
| |
Abstract: | At the Plant Breeding Institute, Cambridge, there have been recognized three physiological races of blight ( Phytophthora infestans ), A, B and C ; and at the Scottish Society for Research in Plant Breeding, Edinburgh, there have been used five races, A, B 1, B 2, C and D , obtained in the British Isles. It is shown that the two Cambridge types of differential hosts, AbC and ABc (where A = resistant to race A, a = susceptible to race A , etc.), are Ab 1 b 2 CD and AB 1 B 2 cD respectively on the Scottish scheme, and that the Cambridge races A, B and C correspond to the Scottish races A, B 1 and C respectively. A number of blight isolates were tested on both the Cambridge and Scottish differential hosts. Isolates of race types A, B 1, B 1, C and D were found. The identification and origin of physiological races of blight, and the breeding of blight-resistant potatoes, are discussed. |
| |
Keywords: | |
|
|