NDLI: Molecular variation in Rhynchosporium secalis isolates obtained from hotspots

Content Provider	Springer Nature Link
Author	Williams, K. Donnellan, S. Smyl, C. Scott, L. Wallwork, H.
Copyright Year	2003
Abstract	A unique sampling strategy was used to search for genetic similarity among isolates of Rhynchosporium secalis, the causal agent of leaf scald of barley. A field of barley cv. Skiff with discrete ‘hotspots’ of leaf scald was identified and infected leaves were collected for this study. The isolates were genotyped using amplified fragment length polymorphism (AFLP) analysis. In contrast to previous reports of high diversity of R. secalis isolates in areas of only 1 m$^{2}$, we found close genetic similarity between isolates from the same hotspot as determined by AFLP marker alleles, with a higher level of variation between isolates from different hotspots. A UPGMA phenogram showed that most isolates clustered with members of the same hotspot. This pattern is consistent with the inoculum source for the hotspots being airborne ascospores or wind-dispersed conidia from a local founder population, borne in splash-created aerosols. AFLP variation within hotspots suggests a high rate of mutation within a few cycles of fungal infection. A collection of isolates from cv. Skiff plots in a straw-inoculated disease nursery 60 km from the hotspot field was fingerprinted with AFLPs for comparison and was found to have much greater genotypic diversity.
Starting Page	257
Ending Page	262
Page Count	6
File Format	PDF
ISSN	01560972
Journal	Australasian Plant Pathology
Volume Number	32
Issue Number	2
e-ISSN	14486032
Language	English
Publisher	Springer Netherlands
Publisher Date	2003-01-01
Publisher Institution	Australasian Plant Pathology Society
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Pathology Plant Sciences Agriculture Entomology Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science

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