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Henrik StotzAssistant Professor (adjunct) stotzhe@science.oregonstate.edu Faculty of the Center for Genome Research and Biocomputing Office/Lab: ALS 4051 |
Postharvest physiology
Post-harvest pests and diseases cause significant losses of perishable fruits, vegetables, and flowers. Molecular genetic tools will be used to study the influence of development on plant susceptibility to pathogens and herbivores. Most fungi that attack fruits and vegetables are necrotrophic pathogens that kill plant cells prior to colonization. Botrytis cinerea, the causal agent of gray mold, attacks more than 200 plant species, including the genetic model organisms, such as Arabidopsis and tomato (Lycopersicon esculentum). Three different approaches will be used to enhance resistance of tomato to B. cinerea. (1) Utilization of wild tomato relatives to isolate quantitative trait loci that confer resistance or susceptibility to B. cinerea. (2) Genomic studies of infection-related changes in fungal and plant gene expression to unravel molecular mechanisms underlying pathogen virulence and host defense. (3) Isolation and characterization of antimicrobial peptides that inhibit fungal growth in vitro.
In addition, the interaction between a closely related fungal pathogen, Sclerotinia sclerotiorum, and bean (Phaseolus vulgaris) is studied in collaboration with Jim Myers in the Department of Horticulture to find new approaches for enhancing resistance to white mold. Potential contributions of oxalate and reactive oxygen species to genetic differences in resistance to S. sclerotiorum among bean species are emphasized.
Xiaomei Guo
Joel Davis
Aya Akagi (Ph.D. expected 2008)
HORT445 Fruit Quality
HORT/MCB505 Plant Development
http://hort.oregonstate.edu/stotzhe/index.html
Chipps TJ, Gilmore B, Myers JR, Stotz HU (2005) Relationship between oxalate, oxalate oxidase activity, oxalate sensitivity, and white mold susceptibility in Phaseolus coccineus . Phytopathology 95: 292-299 (cover page)
Guimaraes RL, Stotz HU (2004) Sclerotinia sclerotiorum produces oxalic acid to deregulate guard cells during infection. Plant Physiology 136: 3703-3711 (highlighted)
Guimarães, RL, Chetelat, RT, Stotz, HU (2004) Resistance to Botrytis cinerea in Solanum lycopersicoides is dominant in hybrids with tomato, and involves induced hyphal death. Europ. J. Plant Pathol. 110: 13-23.
Berger, S, Mitchell-Olds, T, Stotz, HU (2002) Local and differential control of vegetative storage protein expression in response to herbivore damage in Arabidopsis thaliana. Physiol. Plantarum 114: 85-91.
Stotz, HU, Koch T, Biedermann, A, Weniger, K, Boland, W, Mitchell-Olds, T (2002) Evidence for regulation of resistance in Arabidopsis to Spodoptera littoralis by salicylic and jasmonic acid signaling pathways. Planta 214: 648-652.
Stotz HU, Augustin R, Khalturin K, Kuznetsov S, Rinkevich B, Schröder J, Bosch TCG (2002) Novel approaches for the analysis of immune reactions in Tunicate and Cnidarian model organisms. Proc. 18th Intern. Congr. Zool. 127-132.
Stotz, HU, Pittendrigh, B, Kroymann, J, Weniger, K, Fritsche, J, Bauke, A, Mitchell-Olds, T (2000) Induced plant defense responses against chewing insects. Ethylene signaling reduces resistance of Arabidopsis against Egyptian cotton worm but not diamondback moth. Plant Physiol. 124: 1007-1019
Stotz, HU, Bishop, JG, Bergmann, CW, Koch, M, Albersheim, P, Darvill, AG, Labavitch, JM (2000) Identification of target amino acids that affect interactions of fungal polygalacturonases and their plant inhibitors. Physiol. Mol. Plant Pathol. 56: 117-130.
Stotz, HU, Kroymann, J, Mitchell-Olds, T (1999) Plant-insect interactions. Curr. Opinion Plant Biol. 268-272.
Stotz, HU, Long, SRL (1999) Expression of the pea (Pisum sativum L.) a-tubulin gene TubA1 is correlated with cell division activity. Plant Mol. Biol. 41: 601-614.
