Journal article
Effects of host and pathogen genotypes on inducibility of resistance in tomato (Solanum lycopersicum) to Phytophthora infestans



Publication Details
Authors:
Sharma, K.; Butz, A.; Finckh, M.
Publisher:
WILEY-BLACKWELL PUBLISHING, INC
Publication year:
2010
Journal:
Plant Pathology
Pages range:
1062-1071
Volume number:
59
Start page:
1062
End page:
1071
Number of pages:
10
ISSN:
0032-0862

Abstract
Thirteen tomato (Solanum lycopersicum) accessions were tested for inducibility of resistance against two isolates of Phytophthora infestans using BABA (dl-3-amino butyric acid) as the inducing agent. In a more detailed trial, six of the accessions were assessed for inducibility of resistance to six P. infestans isolates on three leaves of different age per plant. Plants were inoculated 1 week after treatment with BABA. Area under the disease progress curve (AUDPC), sporulation capacity (SC) and infection efficiency (IE) were all affected by treatment with BABA. On leaves of all ages AUDPC was most affected by induction (43-100% reduction on the youngest leaves) followed by SC (14-100%) and IE (0-100% reduction). Tomato genotypes varied significantly in inducibility of resistance against P. infestans and the degree of induction generally decreased with increasing leaf age, whilst the absolute susceptibility with respect to AUDPC and SC rarely changed. The level of induction was not always related to the resistance level of the tomato accession and it was significantly influenced by the pathogen isolate used for challenge inoculation. The results show that inducibility of resistance is a selectable trait that is, however, isolate-specific.


Keywords
BABA, genetic variation, induced resistance, late blight of tomato

Last updated on 2019-25-07 at 16:15