INDUCED SYSTEMIC RESISTANCE IN CUCUMBER AND TOMATO AGAINST CUCUMBER MOSAIC CUCUMOVIRUS USING PLANT GROWTH-PROMOTING RHIZOBACTERIA (PGPR)

Citation
Gs. Raupach et al., INDUCED SYSTEMIC RESISTANCE IN CUCUMBER AND TOMATO AGAINST CUCUMBER MOSAIC CUCUMOVIRUS USING PLANT GROWTH-PROMOTING RHIZOBACTERIA (PGPR), Plant disease, 80(8), 1996, pp. 891-894
Citations number
23
Categorie Soggetti
Plant Sciences
Journal title
ISSN journal
01912917
Volume
80
Issue
8
Year of publication
1996
Pages
891 - 894
Database
ISI
SICI code
0191-2917(1996)80:8<891:ISRICA>2.0.ZU;2-A
Abstract
Plant growth-promoting rhizobacteria (PGPR) strains 89B-27 (Pseudomona s fluorescens) and 90-166 (Serratia marcescens), which previously demo nstrated induced systemic resistance in cucumber against some fungal a nd bacterial diseases, were tested for their capacity to protect Cucum is sativus L. cv. Straight 8 from disease development of cucumber mosa ic cucumovirus (CMV). Seed treatment with both PGPR strains significan tly and consistently reduced mean numbers of symptomatic plants when C MV was inoculated onto cotyledons. Plants treated with PGPR did not de velop initial symptoms 14 days after CMV inoculation and remained symp tomless throughout the experimental period. In a comprehensive study w ith cucumber, no viral antigen could be detected by enzyme-linked immu nosorbent assay (ELISA) in any asymptomatic PGPR-treated plants; where as CMV was evident in every leaf of symptomatic plants. The same two P GPR strains were evaluated for effects on CMV symptom development in t omato in three experiments by measuring the disease severity at six ob servation dates. In all experiments, the area under the disease progre ss curve (AUDPC) was significantly lower with strain 89B-27 than in th e nonbacterized control. The AUDPC with strain 90-166 was also signifi cantly lower than with strain 89B-27. These results suggest that PGPR should be further evaluated for their potential to contribute toward m anagement of viral plant diseases.