The ultimate goal of my research is to understand viruses and viral diseases for the betterment of agriculture. Our research involves a number of important viruses that infect plants, which include Grapevine rupestris stem pitting-associated virus (GRSPaV), a ubiquitous and important pathogen of grapes worldwide. Current research directions include: Processing and subcellular localization of polyproteins; structure and cellular localization of viral replication complexes; evolution and bio-informatics of grapevine viruses; development of virus-induced gene-silencing vectors ; and, development and application of technologies for the diagnosis of grapevine viruses.Learn More
Keyword: Crop plant physiology
My research group investigates biotic and abiotic stress on plants at the cellular and sub-cellular biochemical and molecular levels. The objective is to identify what changes occur in plant cells upon exposure to stress and which of these changes aid the plant to increase its tolerance to the stress.A major focus currently is the investigation of freezing stress tolerance in grapevines. Winters in Ontario can cause substantial damage to the cultivated grapes used in the Wine Industry, whereas wild grapes have no problems. We try to find out what the molecular basis is for this phenomenon. The ultimate goal is to use this knowledge to improve freezing and drought stress tolerance in the cultivated grapes.Learn More
My research explores biodiversity from different perspectives and scales. We have develop molecular diagnostic tools for plant identification, including herbal product authentication and certification. Also, we contribute to the Plant Barcode of Life, investigating intra and interspecific variation in plants, and incorporate both Indigenous knowledge and DNA-based approaches to understanding diversity. In addition, I have extensively researched the effects of ecosystem management on community structure. Lastly, I am engaged in the scholarship of teaching and learning and have recently looked at 1) learning objects as mechanisms of engagement, 2) active learning within large first year biology classes, and 3) ancient pedagogies.Learn More
My research focuses on three main areas of plant cell biology:
1) Characterization of enzymes involved in seed oil biosynthesis.
2) Understanding various aspects of the biogenesis of peroxisomes, including how membrane proteins are targeted to this organelle, and what role the endoplasmic reticulum (ER) serves in the formation of peroxisomes.
3) Identification and characterization of a unique class of integral membrane proteins known as "Tail-Anchored" (TA) proteins.
As they are literally rooted in place, plants possess remarkable mechanisms that perceive, interpret, and respond to internal and external cues so as to optimise plant growth and development relative to prevailing environment conditions. Despite the incredible diversity in plant forms, the molecular mechanisms that control plant responses to internal and external cues are highly conserved across diverse genera. The timing and localisation of these mechanisms shape plant and development. Our research team aims to gain greater insights into molecular mechanisms that plants employ to convert internal cues and external signals into appropriate adjustments in resource acquisition and allocation, focusing on the role of gene regulation in conditioning these adjustments.Learn More
One of the fundamental questions in plant biology concerns the nature of the signals that bring about the transition from vegetative to reproductive growth. My research is aimed at characterizing the developmental signals that cause plants to flower. The primary focus of this work is the maize indeterminate gene (id1). Maize plants that lack id1 function flower extremely late, or not at all, and they exhibit abnormal flower development. The ID1 protein contains zinc-finger motifs, suggesting that it regulates the expression of other genes. Expression analysis reveals that id1 mRNA is expressed only in leaf tissue, suggesting that ID1 acts by controlling the production of leaf-derived signals that mediate the transition to flowering.Learn More
Much of our current effort is focused on understanding the regulation of starch synthesis in storage tissues such as the developing seeds of cereals. Starch is the major determinant of yield in such crops, and has wide application in both the food and non-food industries, yet there remain a huge number of unknowns in what limits the production and structure of this important glucan polymer. There is also an increasing realization that different types of starch provide benefits for human health. Our research covers cereals such as maize, barley, rice, and wheat, as well as the model organism Arabidopsis thaliana. I lead a large, interdisciplinary team whose expertise includes plant biochemistry, genetics, molecular biology, microbiology, human physiology, and nutrition.Learn More
My lab examines the control mechanisms underpinning starch biosynthesis in leaf chloroplasts (which make starch during the daytime, and degrade it at night) of the model plant Arabidopsis thaliana, and non-photosynthetic amyloplasts of cereal endosperms such as maize, wheat, barley and rice which make storage starches. More specifically, we are interested in the biochemical control mechanisms governing the many enzymes and enzyme classes which make up the core pathway of starch biosynthesis. This involves investigating the role of protein-protein interactions and protein phosphorylation in coordinating the proteins involved in starch synthesis and degradation within the plastid to produce the highly ordered and complex structure of the starch granule.Learn More
We are interested in characterizing the mechanisms of pathogenesis, adaptation, and survival in fungal and bacterial microbes from a systems biology perspective through mass spectrometry-based quantitative proteomics. Specifically, research in the lab centres around the following areas:
1) Systems biology to elucidate microbial proteome dynamics and interactions;
2) Mechanistic characterization of pathogenic proteins; and
3) Mass spectrometry-based proteomics for drug discovery and repurposing.