Effect of arbuscular mycorrhizal fungi and Pseudomonas fluorescens on root-rot and wilt, growth and yield of Coleus forskohlii

Root-rot and wilt caused by Fusarium chlamydosporum affects the cultivation of Coleus forskohlii, a medicinal plant grown for its roots, which contain a pharmaceutically important compound called forskolin. In this study, management of this disease under low and high inoculum levels was assessed wit...

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Bibliographic Details
Published in:Biocontrol science and technology 2009-09, Vol.19 (7-8), p.835-841
Main Authors: Singh, Rakshapal, Parameswaran, T.N, Prakasa Rao, E.V.S, Puttanna, K, Kalra, Alok, Srinivas, K.V.N.S, Bagyaraj, D.J, Divya, S
Format: Article
Language:English
Subjects:
biocontrol
biological control
chemical constituents of plants
Coleus
Coleus forskohlii
crop production
disease control
forskolin
forskolin content
Fusarium chlamydosporum
Fusarium wilt
Glomus aggregatum
Glomus fasciculatum
Glomus intraradices
Glomus mosseae
inoculum density
medicinal plants
pathogenicity
plant pathogenic bacteria
plant pathogenic fungi
Plectranthus barbatus
Pseudomonas fluorescens
root growth
root rot
roots
vesicular arbuscular mycorrhizae
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Summary:Root-rot and wilt caused by Fusarium chlamydosporum affects the cultivation of Coleus forskohlii, a medicinal plant grown for its roots, which contain a pharmaceutically important compound called forskolin. In this study, management of this disease under low and high inoculum levels was assessed with four arbuscular mycorrhizal (AM) fungi and a strain of Pseudomonas fluorescens. The AM fungus Glomus fasciculatum and P. fluorescens were the most effective treatments that reduced the severity of root-rot and wilt of C. forskohlii by 56-65% and 61-66%, respectively, under lower and higher levels of pathogen F. chlamydosporum. G. fasciculatum increased the dry shoot and root weight by 108-241% and 92-204%, respectively, while in plants treated with P. fluorescens, an increase of 97-223% and 97-172% in dry shoot and root weight, respectively, was observed. Although P. fluorescens was effective, it gave higher root yields only under lower inoculum level of the pathogen. G. fasciculatum performed equally well under both lower and higher inoculum levels. Increase in yields with both the biocontrol agents was accompanied by increase in P uptake (230-303%) and in K uptake (270-335%). The forskolin content of the roots was significantly increased (14-21%) by G. fasciculatum, P. fluorescens or G. mosseae under lower inoculum level of pathogen.
ISSN:0958-3157
1360-0478
DOI:10.1080/09583150903137601