John OntoyJohn Ontoy

Graduate Student


Major Professor: Dr. Jong Hyun Ham


2018 – at present: Master of Science in Plant Pathology, Louisiana State University Baton Rouge

2009: Bachelor of Science in Agriculture major in Plant Pathology, University of the Philippines Los Baños




By utilizing genomic and bioinformatic tools, my research focus on molecular dissection and characterization of certain resistance traits against diseases, such bacterial panicle blight (BPB) and sheath blight (SB), that can threaten the rice production here in Louisiana due to climatic change specifically due increase in night time temperature. The major goals of the study are to determine and to characterize the quantitative traits (QTL) from a resistant rice variety that can be used for varietal development and to design molecular markers to expedite the breeding process of selecting resistant lines for bacterial panicle blight and sheath blight by marker assisted screening.



February 2010- June 2010: University Research Associate. Institute of Plant Breeding, University of the Philippines Los Baños, Laguna, Philippines

July 2011- July 2015: Researcher.Plant Breeding, Genetics and Biotechnology Division, International Rice Research Institute, Los Baños, Laguna, Philippines

August 2015- November 2017: Research Associate. School of Plant, Environmental and Soil Science, Louisiana State University AgCenter, Baton Rouge LA, United States of America


John Christian Ontoy, Inderjit Barphagha, Adam Famoso and Jong Hyun Ham. Genetic dissection of rice resistance to sheath blight and bacterial panicle blight using recombinant inbred lines of Jupiter and Trenasse. American Phytopathological Society Meeting 2019

Filomena Sta. Cruz, Rizaldo Bayot, John Ontoy, Paul Rommel Elvira, Aubrey Fabro, Eufrocinio Marfori ans Susan May Calumpang. 2010. Detection and Transmission of Candidatus Liberibacter sp Causing Leaf Mottling of Citrus Species Grown in Three Provinces of Southern Luzon, Philippines. Crop protection newsletter 35(1):52-61.

Shalabh Dixit, B. Emma Huang, Ma. Teresa Sta. Cruz, Paul Maturan, Jhon Ontoy and Arvin Kumar. 2014. QTLs for Tolerance of Drought and Breeding for Tolerance of Abiotic and Biotic Stress: An Integrated Approach. PLoS ONE 9(10): e109574. doi: 10.1371/journal.pone.0109574.

Venkata Ramana Rao Puram, John Ontoy, Steven Linscombe and Prasanta Subudhi. 2017. Genetic Dissection of Seedling Stage Salinity Tolerance in Rice Using Introgression Lines of a Salt Tolerant Landrace Nona Bokra. The Journal of heredity 108(6):658-670. doi: 10.1093/jhered/esx067.

Venkata Ramana Rao Puram, John Ontoy and Prasanta Subudhi. 2018. Identification of QTLs for Salt Tolerance Traits and Prebreeding Lines with Enhanced Salt Tolerance in an Introgression Line Population of Rice. Plant Molecular Biology Reporter. doi: 10.1007/s11105-018-1110-2.

Prasanta Subudhi, Teresa de Leon, Ronald Tapia, Chenglin Chai, Ratna Karan, John Ontoy and Pradeep Singh. 2018. Genetic interaction involving photoperiod-responsive Hd1 promotes early flowering under long-day conditions in rice. Scientific Reports 8(1). doi: 10.1038/s41598-018-20324-1.

Md. Shofiq Islam, John Ontoy and Prasanta Subudhi. 2019.Meta-Analysis of Quantitative Trait Loci Associated with Seedling-Stage Salt Tolerance in Rice (Oryza sativa L.). Plants 8(2):33. DOI: 10.3390/plants8020033.