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Microorganisms 2019, 7(1), 23; https://doi.org/10.3390/microorganisms7010023

Geographic Distribution of Avirulence Genes of the Rice Blast Fungus Magnaporthe oryzae in the Philippines

1
Jose Rizal Memorial State University–Tampilisan Campus, Znac, 7116 Tampilisan, Zamboanga del Norte, Philippines
2
Institute of Weed Science, Entomology and Plant Pathology, College of Agriculture and Food Science, University of the Philippines Los Baños, 4031 Los Baños, Laguna, Philippines
3
Molecular Plant Biology, Department of Biochemistry, University of Turku, FI-20520 Turku, Finland
4
Molecular Phytopathology and Mycotoxin Research, University of Göttingen, 37077 Göttingen, Germany
*
Author to whom correspondence should be addressed.
Received: 12 December 2018 / Revised: 14 January 2019 / Accepted: 16 January 2019 / Published: 19 January 2019
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Abstract

A total of 131 contemporary and 33 reference isolates representing a number of multi-locus genotypes of Magnaporthe oryzae were subjected to a PCR test to detect the presence/absence of avirulence (Avr) genes. Results revealed that the more frequently occurring genes were Avr-Pik (81.50%), Avr-Pita (64.16%) and Avr-Pii (47.98%), whereas the less frequently occurring genes were Avr-Pizt (19.08%) and Avr-Pia (5.20%). It was also laid out that the presence of Avr genes in M. oryzae is strongly associated with agroecosystems where the complementary resistant (R) genes exist. No significant association, however, was noted on the functional Avr genes and the major geographic locations. Furthermore, it was identified that the upland varieties locally known as “Milagrosa” and “Waray” contained all the R genes complementary to the Avr genes tested. View Full-Text
Keywords: avirulence genes; Magnaporthe oryzae; Philippines; resistance genes; rice blast avirulence genes; Magnaporthe oryzae; Philippines; resistance genes; rice blast
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Lopez, A.L.C.; Yli-Matilla, T.; Cumagun, C.J.R. Geographic Distribution of Avirulence Genes of the Rice Blast Fungus Magnaporthe oryzae in the Philippines. Microorganisms 2019, 7, 23.

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