Molecular Plant Pathology and Biotechnology

Research Interests:
Molecular Plant-Pathogen Interactions, Molecular Diagnosis of Bacterial and Fungal Plant Diseases, Pathogen Population Structure Analysis, Biocontrol of Plant Diseases, Screening of Botanicals for Control of Plant Diseases

Molecular Plant Pathology Laboratory

Two of my completed research projects dealt with the molecular-based detection and population structure analysis of Xanthomonas oryzae pv. oryzicola, the rice bacterial leaf streak pathogen and Mycosphaerella fijiensis (anamorph Pseudocercospora fijiensis), the causal pathogen of black Sigatoka of banana. Rapid, sensitive, and inexpensive PCR-based detection methods were developed for the two pathogens that allow the early detection of the pathogens from infected plant samples, thus, have potential utility in plant quarantine and in epidemiological studies on the two diseases. The population structure studies provided a clearer understanding of the genetic structure and dynamics of the pathogen populations in the Philippines as well as a deeper insight into the evolutionary processes that shaped the pathogen populations.

Description of extension project involvements, trainings conducted, other extension activities such as lectures, reviews, webinars, etc.
My recent extension activities include serving as: Resource Speaker in the symposium “Advances in Biotech R & D: Uncovering the Different Applications of Biotech in Agriculture & Food Science” sponsored by DA-Biotech, Resource Person in the write-shop “Philippine National Biological Materials of Concern List Write-shop II: Towards an NBMC Program” sponsored by the Anti-terrorism Council – Program Management Council, Office of the President, Malacañang and Trainings on “Plant Health Care for Trade Facilitation” sponsored by the Asian Development Bank, and Reviewer of the scientific paper “Molecular characterization, cross-infection potential and fungicide sensitivity of Xanthomonas campestris pv. mangiferaeindicae responsible for the recent outbreak of mango bacterial black spot disease in Ghana submitted for publication in Archives of Phytopathology and Plant Protection.

Bachelor’s Degree:
BS in Biology Major in Microbiology

Bachelor’s Degree – Granting Institution and Address:
University of the Philippines Los Baños, College, Laguna, Philippines

Master’s Degree:
MS in Microbiology minor in Biochemistry

Master’s Degree – Granting Institution and Address:
University of the Philippines Los Baños, College, Laguna, Philippines

PhD. Program:
PhD in Microbiology minor in Genetics

PPTH Undergraduate Courses:
PPTH 102. Control of Plant Diseases,
PPTH 103. Introductory Phytobacteriology,
PPTH 131. Research in Plant Pathology,
PPTH 191. Special Topics,
PPTH 199. Undergraduate Seminar,
PPTH 190. Special Problem

PPTH Graduate Courses:
PPTH 201. Pathogenesis,
PPTH 218. Physiology of Plant Pathogenic Fungi,
PPTH 251 (or MBB 251). Molecular Plant-Pathogen Interactions,
PPTH 291. Special Topics,
PPTH 299. Graduate Seminar,
PPTH 290. Special Problem

Other Courses:
AGRI 41. Principles of Crop Protection,
ABT 140. Biotechnology in Crop Protection

M.J.C. Mendoza and E.Y. Ardales. 2019. Population structure of banana black Sigatoka pathogen [Pseudocercospora fijiensis (M. Morelet) Deighton] in Luzon Philippines. Philippine Agricultural Scientist 102(3): 211-219.

Burgos, M.R.G, Katimbang, M.L.B., Dela Paz, M.A.G., Beligan, G.A., Goodwin, P.H., Ona, I.P., Mauleon, R.P., Ardales, E.Y. and Vera Cruz, C.M. 2013. Genetic variability and aggressiveness of Bipolaris oryzae in the Philippines. European Journal of Plant Pathology. 137(1) September 2013 issue (DOI 10.1007/s10658-013-1256-x; ISSN 0929-1873)

Ardales, E.Y., Moon, S.-J., Park, S.-R., Shin, D.-J., Noh, T.-W.and Byun, .-O. 2009. Inactivation of argG, encoding the argininosuccinate synthetase from Xanthomonas oryzae pv. oryzae, impaired bacterial growth and virulence in planta. Canadian Journal of Plant Pathology 31:368-374.

Moon, S.-J., Ardales, E.Y, Shin, D., Han, S.-Y., Lee, H.E., Park, S.-R., Jeong, M.J., Lee, S.-K, Kwon, H.-B., Seo, H. Yi, B.-Y., Park, S.-C. and Byun, M.-O. 2009. The EREBP gene from Solanum tuberosum confers resistance against an oomycete and a bacterial pathogen in transgenic potato and tobacco plants. Fruit, Vegetable and Cereal Science and Biotechnology Journal 3 (special issue 1):72-79.

Dela Paz, M. A. G., Goodwin, P. H., Ardales, E. Y., Raymundo, A. K., and Vera Cruz, C. M. 2006. Conditions affecting bipolar conidial germination of Bipolaris oryzae. Plant Pathology. 55:756-765.

Zhao, B.Y., Ardales, E.Y., Brasset, E., Claflin, L., Leach, J.E., and Hulbert, S.H. 2004. The Rxo1/Rba1 locus of maize controls resistance reactions to pathogenic and non-host bacteria. Theoretical and Applied Genetics. 109(1):71-79.

Zhao, B. Y., Ardales, E.Y., Raymundo, A., Bai, J, Trick, H.N., Leach, J.E., and Hulbert, S.H. 2004. The avrRxo1 gene from the rice pathogen Xanthomonas oryzae pv. oryzicola confers a nonhost defense reaction on maize with resistance gene Rxo1. Molecular Plant-Microbe Interaction. 17(7):771-779.

Raymundo, A.K., Briones, Jr., A., Ardales, E.Y., Perez, M.T., Fernandez, L.C., Leach, J. E., Mew, T.W., Ynalves, M.A., McLaren, C.G., and Nelson, R.J. 1999. Analysis of DNA polymorphism and virulence in Philippine strains of Xanthomonas oryzae pv. oryzae Plant Disease. 83(5):434-440.

Vera Cruz, C.M., Ardales, E.Y., Skinner, D.Z., Talag, J., Nelson, R.J., Louws, F.J., Leung, H., Mew, T.W., and Leach, J.E. 1996. Measurement of haplotypic variation in Xanthomonas oryzae pv. oryzae within a single field by Rep-PCR and RFLP analyses. Phytopathology 86:1352-1359.

Ardales, E.Y., Leung, H., Vera Cruz, C.M., Mew, T.W., Leach, J.E., and Nelson, R.J. 1996. Hierarchical analysis of spatial variation of the rice bacterial blight pathogen across diverse agroecosystems in the Philippines. Phytopathology 86:241-252.

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B-208, Biological Sciences Building, UPLB, College, Laguna