Reference Report for SoyBase91001751
| Title: | Differentiation of three homogeneous groups of Rhizoctonia solani anastomosis group 4 by analysis of fatty acids |
| Authors: | Johnk, J.S., Jones, R.K. |
| Source: | Phytopath. 2001, 91(9):821-830 |
| Abstract: | Profiles of fatty acids from 70 isolates of R. solani anastomosis group (AG)-4 clustered into three groups, corresponding to homogeneous group (HG)-I, HG-II, and a newly described HG-III. Isolates from Georgia groundnuts exhibiting limb rot were characterized as gas chromatography (GC) subgroup 1 (GC-1) and contained HG-I isolates. Isolates from diseased soyabean hypocotyls grown in North Dakota, USA and sugarbeet seedlings, taproots, and tare soil in Minnesota and North Dakota, USA were characterized as GC subgroup 2 (GC-2), and contained predominantly HG-II isolates but also included three distinct isolates based on fatty acid methyl ester (FAME) analysis and morphological features. Selected isolates from North Carolina, USA cucumbers clustered into three distinct groups that corresponded to HG-I, HG-II, and the newly described HG-III. Distinct isolates from the soyabean and sugar beet populations clustered with HG-III. Fatty acid profiles of AG-4 were compared with FAME library profiles of AG-1, AG-2 type 2 and AG-3, which were developed in previous studies, and were sufficiently different that they could be used to support speciation of this group from R. solani. It is suggested that binomial R. practicola may be appropriate for the portion of AG-4 identified as HG-II |
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