Alex Johnson

Alex Johnson is a Professor and Associate Dean (International) in the School of BioSciences, Faculty of Science, at the University of Melbourne, where he serves as the principal investigator of the Johnson Lab. Originally from the United States, he obtained his BA in Biology from Gustavus Adolphus College in 1996, MSc in Horticulture from Virginia Tech in 1998, PhD in Horticulture from Virginia Tech in 2001, and Graduate Certificate in University Teaching from the University of Melbourne in 2016. Johnson's research specializes in plant biology and agricultural biotechnology, focusing on micronutrient deficiencies in staple crops. His lab develops biofortified rice, wheat, and grain legumes enhanced with iron and zinc through genetic engineering strategies, such as constitutive overexpression of the OsNAS2 gene, which mobilizes these metals using nicotianamine. Studies reveal wheat's hexaploid genome contains at least 21 NAS genes, and synchrotron analyses confirm nutrient localization and bioavailability superior to phytic acid complexes. The lab also examines climate change impacts, including elevated CO2 levels projected for 2050, which reduce iron, zinc, and protein in C3 crops, proposing countermeasures for nutritional resilience and food security for over two billion people affected by hidden hunger.

Johnson's influential publications include "Constitutive overexpression of the OsNAS gene family reveals single-gene strategies for effective iron- and zinc-biofortification of rice endosperm" (PLoS ONE, 2011), "Biofortified indica rice attains iron and zinc nutrition dietary targets in the field" (Scientific Reports, 2016), "Metabolic engineering of bread wheat improves grain iron concentration and bioavailability" (Plant Biotechnology Journal, 2019), "Improved Salinity Tolerance of Rice Through Cell Type-Specific Expression of AtHKT1;1" (PLoS ONE, 2010), and "Increasing ascorbate levels in crops to enhance human nutrition and plant abiotic stress tolerance" (Current Opinion in Biotechnology, 2017). These works demonstrate field-viable biofortification achieving approximately 13 ppm iron and 28 ppm zinc. He teaches undergraduate and postgraduate subjects, supervises postgraduate students, sits on the board of the University of Melbourne Botany Foundation, and is a College Fellow at Ormond College. Johnson received the 2016 University of Melbourne Excellence Award for Research Engagement and delivers seminars on plant nutrition globally.

Professional Email: johnsa@unimelb.edu.au