ASU, Joint Appointment: Chemistry and Physics, Arkansas Biosciences Institute
- Comparative Metabolomics Cluster
- Plant Productivity 'Set-Points' Cluster
- Plant Interactions with Other Organisms Cluster
- Abiotic Stress
- Gene Regulation & Signal Transduction
- Plant Secondary Metabolism/ Metabolomics/ Metabolic Engineering
- Phytochemicals & Human Health
- Plant Genetics/ Breeding
- Plant Environmental Physiology
- Plant-Made Industrial/ Pharmaceutical Proteins
- Plant Tissue Culture
- Protein Processing & Trafficking
- Transformation Technologies
The metabolism of aerobic organisms leads to various risks for oxidative damage, due to the formation of reactive oxygen species (ROS). These highly reactive molecules are also formed as a result of abiotic and biotic stress factors. In low amounts ROS play key roles as signaling molecules, however, in excess they cause harmful effects. Plants have developed strategies to keep ROS under control. The ability to detoxify ROS is accomplished in part by vitamin C and glutathione. Plants have evolved at least four different pathways to make vitamin C (a.k.a. ascorbic acid, AsA). These routes use D-mannose/L-galactose, D-galacturonate, L-gulose and myo-inositol as main precursors.
Lorence and her colleagues at Virginia Tech discovered the inositol pathway to AsA. This route involves four enzymes: myo-inositol oxygenase (MIOX), glucuronate reductase (GlcUR), gluconolactonase (GNL), and L-gulono-1,4-lactone oxidase (GLOase). The Lorence Laboratory uses genetic, biochemical and physiological approaches to study the function of AsA in plant growth, abiotic and biotic stress responses. Our main models of study are Arabidopsis thaliana (mouse ear cress), rice (Oryza sativa) and tomato (Solanum lycopersicum). Our long term goals are to understand how the AsA metabolic network is regulated and to study the role of the chloroplastic, ER and mitochondrial subcellular AsA pools in the underlying biochemical mechanisms leading to tolerance to oxidative stress and delayed senescence. A list of ongoing projects is presented below.
1.Cruz-Morales S, Castañeda-Gómez J, Figueroa-González G, Mendoza-García AD, Lorence A, Pereda-Miranda R (2012). Mammalian multidrug resistance lipopentasaccharide inhibitors from Ipomoea alba seeds. Journal of Natural Products.doi.org/10.1021/np300414d
2.Haroldsen V, Chi-Ham CL, Kulkarni S, Lorence A, and Bennet AB (2011) Constitutively expressed DHAR and MDHAR influence fruit, but not foliar ascorbate levels in tomato. Plant Physiology and Biochemistry 49: 1244-1249.
3.Goggin FL, Avila CA, and Lorence A (2010) Vitamin C content in plants is modified by insects and influence susceptibility to herbivory. BioEssays 32: 777-790.
4.Suza WP, Avila CA, Carruthers K, S Kulkarni, Goggin FL, and Lorence A (2010) Exploring the Impact of Wounding and Jasmonates on Ascorbate Metabolism. Plant Physiology and Biochemistry 48: 337-350.
5.Zhang W, Lorence A, Gruszewski HA, Chevone BI and Nessler CL (2009) AMR1, an Arabidopsis gene that coordinately and negatively regulates the mannose/L-galactose ascorbic acid biosynthetic pathway. Plant Physiology 150: 942-950.
6.Lorence A, Mendes P, Chevone BI, and Nessler CL (2004) myo- Inositol Oxygenase Offers a Possible Entry Point into Plant Ascorbate Biosynthesis. Plant Physiology 134: 1200-1205.
Editor of the book: “Recombinant Gene Expression, Reviews and Protocols, Third Edition” (2012) A Lorence (ed.) Molecular Biology Series, Humana/Springer, New York. ISBN # 978-1-61779-432-2, e-ISBN 978-1-61779-433-9, DOI 10.1007/978-1-61779-433-9.
Argelia Lorence, PhD, Arkansas Biosciences Institute
|Current Lab Members|
Katherine A Lisko
Jonathan A Radin
Satya Veena Tatambhotla
Shashank Kulkarni (MS Chemistry)
Dr. Maureen Dolan, research assistant professor | Arkansas State University, Jonesboro
Dr. Fiona L. Goggin, professor | University of Arkansas, Fayetteville
Dr. Kathleen Gilbert, professor | Arkansas Children's Hospital Research Institute and UAMS
Dr. Carole L. Cramer, professor | Arkansas State University, Jonesboro
Dr. Anna Radominska-Pandya, professor | UAMS
Dr. Gregory Phillips, professor | Arkansas State University, Jonesboro
Dr. Anna M. McClung, director | USDA-ARS Dale Bumpers National Rice Research Center
Dr. Vibha Srivastava, professor | University of Arkansas, Fayetteville
Dr. Carmen M. Gurrola-Diaz, associate professor | Universidad de Guadalajara, Mexico
Dr. Rogelio Pereda-Miranda, professor | Facultad de Quimica-UNAM, Mexico
Dr. Marisa Luisa Villarreal-Ortega, professor | CEIB/UAEM, Mexico
Dr. Rachel Mata, professor | Facultad de Quimica-UNAM, Mexico
1) Study of the role of ascorbate in the control of aging and reproductive activity in plants
2) Metabolic engineering of vitamin C in plants
3) Intersection of ascorbate regulation, jasmonate-signaling, and defense against herbivores in plants (in collaboration with Dr. Fiona Goggin, UA-Fayetteville)
4) Study of the role of ascorbate in mitigating ER and cellular stress associated with plant-based protein production (in collaboration with Dr. Maureen Dolan, ASU)
5) Study of the role of ascorbate at conferring plants tolerance to environmental pollutants (TCE phytoremediation project in collaboration with Dr. Kathleen Gilbert, ACHRI, Dr. Carole Cramer, ASU, and Dr. Anna Radominska-Pandya, UAMS)
6) Vitamin C metabolism in rice (collaboration with Dr. Gregory Phillips, ASU, Dr. Anna McClung, USDA-Stuttgart, AR and Dr. Vibha Srivastava, UA-Fayetteville)
7) Vitamin C metabolism in lupins (collaboration with Dr. Carmen Gurrola-Diaz, Universidad de Guadalajara, Mexico)
8) Vitamin C metabolism in morning glories (collaboration with Dr. Rogelio Pereda-Miranda, Facultad de Química-UNAM, Mexico)
9) Molecular speciation of selected Mexican medicinal plants (collaboration with Dr. Maria Luisa Villarreal CEIB-UAEM, Cuernavaca, Mexico and Dr. Rachel Mata, Facultad de Química-UNAM, Mexico)
Argelia Lorence presented an opening plenary talk entitled, “Engineering elevated vitamin C in plants to improve their nutritional content, growth, and tolerance to stress”, at the 51st Annual Meeting of the Phytochemical Society of North America, August 11-15, 2012, London Ontario, Western University.
PDF of all abstracts and short bios of plenary speakers