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- Title
<em>Rhizoctonia solani</em> Incited Damping-off in Radish Suppressed by Plasmid and Non-plasmid Carrying Strains of R. <em>solani</em> that Enhance Host Chitinase Activity.
- Authors
Tschen, J. S.-M.; Chen, C.-S.; Hsue, C.-C.; Ling, Y.-L.; Cheng, Y.-H.
- Abstract
Thirteen <em>Rhizoctonia solani</em> isolates belonging to arms-tomosis group four were examined. All of the isolates carry plasmids except isolates CHU344 and CHU345. Plasmids were analysed by agarose gel electrophoresis and observed by transmission electron microscope. The plasmid DNA is linear, having a size of 2.6 kbp. The termini of the plasmid have a hairpin structure. The replication of plasmid DNA of <em>R. solani</em> CHU341 (pCHU341) was demonstrated by electron microscopy. Virulence of the fungi was tested on radish seedlings and expressed according to percentage of radish seedlings that damped-off. Strains CHU341. CHU344. CHU345. CHU346, CHU347, CHU348, CHU350 and CHU353, suppressed damping-off of radish seedlings by the viru lent isolates, CHU342. CHU349, CHU3S1 or CHU352 and was expressed according to a suppressiveness index. The chitinase activities of radish seedlings increased from 10 to 20 times after inoculation with suppressive isolates, CHU341, CHU344 and CHU345. The results indicate that damping-off of radish seedlings caused by <em>R. solani</em> can be protected by related strains with or without plasmids. The protection of the seedlings may result from the enhancement of chitinase activities induced by the suppressive strains of <em>R. solani</em>.
- Subjects
RHIZOCTONIA solani; CORTICIUM sasakii; RADISHES; PLASMIDS; CYTOPLASMIC inheritance; CHITINASE
- Publication
Journal of Phytopathology, 1997, Vol 145, Issue 8/9, p363
- ISSN
0931-1785
- Publication type
Article
- DOI
10.1111/j.1439-0434.1997.tb00415.x