Distribution of Mating Type Alleles and Fertility Status of Magnaporthe grisea Causing Gray Leaf Spot of Perennial Ryegrass and St. Augustinegrass Turf

Plant Disease
G Viji, W Uddin

Abstract

Isolates of Magnaporthe grisea causing gray leaf spot of perennial ryegrass (PR) (Lolium perenne) and St. Augustinegrass (SA) (Stenotaphrum secundatum) were analyzed for mating compatibility and fertility. A total of 312 isolates of M. grisea from PR and 62 isolates from SA were paired with hermaphroditic tester strains from finger millet (Eleusine coracana), rice (Oryza sativa), and wheat (Triticum aestivum). All the PR isolates belonged to a single mating type, MAT1-2. Male fertility was observed in all these isolates. Asci and ascospores were not produced regardless of their developmental stage. Of the 139 (44.6%) isolates from PR that formed perithecia with the fertile tester strains, 83 (59.7%) were highly fertile, 33 (23.7%) were intermediately fertile, and 23 (16.5%) were low in fertility. Both mating types were observed among the isolates of SA, where MAT1-1 predominated the MAT1-2 type. An equal number of male and female fertile isolates were detected among these isolates obtained from a single location; however, none of the isolates behaved as hermaphrodites. Few ascospores were produced in crosses between two isolates of SA and a finger millet tester. Of the 62 monoconidial isolates of SA tested, 19 (30.6%) isolates ...Continue Reading

References

Apr 1, 1976·Canadian Journal of Microbiology·A D Genovesi, C W Magill
Jan 1, 1993·Molecular Plant-microbe Interactions : MPMI·K F DobinsonJ E Hamer
Mar 12, 2004·Annual Review of Phytopathology·R S Zeigler
Apr 1, 1997·Phytopathology·S B Goodwin
Oct 1, 1999·Plant Disease·Poonsak MekwatanakarnR S Zeigler

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Citations

May 1, 2005·Molecular Plant Pathology·Mark L Farman, Yun-Sik Kim
Jan 26, 2011·PloS One·Jennifer L Anderson, Carol A Shearer
Sep 2, 2003·Fungal Genetics and Biology : FG & B·R S BennettG C Bergstrom
Feb 16, 2007·Fungal Genetics and Biology : FG & B·S F CovertX B Yang

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