Collaborative research project
  Counterpart    Arid Land Research Center, Tottori University (Dr. Shinobu INANAGA)
  Subject            Physiological and ecological adaptation of plants to arid land conditions
  Period             1993-1997
  Fund                Collaborative research grant, Arid Land Research Center
  
  Counterpart     International Rice Research Institute (Dr. Len. J. Wade)
  Subject            Genetic variation in root traits for drought resistance
  Period              1994-1996
  Fund                Japan-IRRI Shuttle Project
 
  Counterpart     Philippine Root Crop Research and Training Center,
                          Visayas State College of Agriculture (Dr. Jose R. Pardales Jr.)
  Subject            Water and nutrient uptake mechanism in cassava and sweetpotato
  Period              1998-1999
  Fund                Japanese Society for the Promotion and Science (project member)
 
  Counterpart     International Rice Research Institute (Dr. Len. J. Wade)
  Subject            Response of direct-seeded rainfed lowland rice
                          to early-season drought and rewatering
  Period             1997-2001
  Fund                Japan-IRRI Shuttle Project
 
  Counterpart     PhilRootcrop, Leyte State University (Dr. Jose R. Pardales Jr.)
  Subject            Evaluation of drought tolerance and survey of genetic resources
                          for tropical rootcrops
  Period              2001-2004
  Fund                Grant-in-Aid for Scientific Research by the Ministry of Education,
                          Science,  Technology, Sports and Culture, Japan
  
  Counterpart     International Rice Research Institute (Dr. Rachid Serraj) and others
  Subject            Targeting Drought‐Avoidance Root Traits to Enhance Rice Productivity
                          under Water‐Limited Environments
  Period              2008-2011
  Fund                Generation Challenge Program
 
  Counterpart     Philippine Rice Research Institute  (Dr. Roel R. Suralta)
  Subject            Evaluation of interaction of root traits-related quantitative trait
                          loci (QTL) and soil stress factors in rainfed lowland and upland rice
  Period              2010-2013
  Found              Grant-in-Aid for Scientific Research by the Ministry of Education,
                          Science,  Technology, Sports and Culture, Japan