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Avenacin Production in Creeping Bentgrass (Agrostis stolonifera) and Its Influence on the Host Range of Gaeumannomyces graminis.

Authors :
Thomas, S. L.
Bonello, P.
Lipps, P. E.
Boehm, M. J.
Source :
Plant Disease. Jan2006, Vol. 90 Issue 1, p33-38. 7p. 4 Charts, 2 Graphs.
Publication Year :
2006

Abstract

Avenacinase activity has been shown to be a key factor determining the host range of Gaeumannomyces graminis on oats (Avena saliva). G. graminis var. avenae produces avenacinase, which detoxifies the oat root saponin avenacin, enabling it to infect oats. G. graminis var. tritici does not produce avenacinase and is unable to infect oats. G. graminis var. avenae is also reported to incite take-all patch on creeping bentgrass (Agrostis stolonifera). It is unknown whether creeping bentgrass produces avenacin and if the avenacin-avenacinase interaction influences G. graminis pathogenicity on creeping bentgrass. The root extracts of six creeping bentgrass cultivars were analyzed by fluorimetry, thin-layer chromatography, and high performance liquid chromatography for avenacin content. Avenacin was not detected in any creeping bentgrass cultivars, and pathogenicity assays confirmed that both C. graminis var. avenae and G. graminis var. tritici can infect creeping bentgrass and wheat (Triticum aestivum), but only G. graminis var. avenae incited disease on oats. These results are consistent with the root analyses and confirm that avenacinase activity is not required for creeping bentgrass infection by G. graminis. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
01912917
Volume :
90
Issue :
1
Database :
Academic Search Index
Journal :
Plant Disease
Publication Type :
Academic Journal
Accession number :
19525202
Full Text :
https://doi.org/10.1094/PD-90-0033