His main research interests are the following areas: 1) Functional genomic analysis of nodulation and nitrogen fixation in legumes: Molecular components of the control of nodulation (AON) in soybean and Lotus japonicus Analysis of ethylene and ABA insensitive legume mutants and transgenics Genetic transformation of soybean and Lotus Transcription analysis of legumes Analysis of acid soil effect on nodulation Analysis of Nodulation factor receptors NFR1 and NFR5 in soybean Mutational analysis of the GmNARK receptor kinase 2) Sustainable Biofuel Production from Legume Tree Pongamia pinnata: Analysis of genetic stability Fatty acid analysis Field trials Clonal propagation Gene and promoter discovery Functional genomics Genetic transformation Professor Gresshoff is member of the editorial boards of several international journals (among others Molecular Plant, J. Plant Physiology, Symbiosis). He also is a member of the Advisory Committee of the OGTR as well as the Biofuel and Bioenergy Committee of RIRDC.