Fellow of the American Phytopathological Society (2020)
Gwyn A. Beattie is the Robert Earle Buchanan Distinguished Professor of Bacteriology for Research and Nomenclature at Iowa State University,[1] working in the areas of plant pathology and microbiology.[2][3] Beattie uses molecular and cellular perspectives to examine questions about the ecology of plant bacteria such as the ways in which plant leaves respond to environmental cues, and the genomics underlying microbial responses on and within plant leaves.[4] Her work on the microbiome and the positive influence of microbes has implications for plant health and productivity, with the potential to improve crop yields and counter food insecurity.[4][5]
Gwyn Beattie received a B.A. in chemistry from Carleton College (1985). She earned a Ph.D. in, cellular and molecular biology from the University of Wisconsin-Madison (1991), working with advisor Jo Handelsman on rhizobium nodulation competitiveness.[4]
Career
Beattie did post-doctoral research in microbial ecology at the University of California-Berkeley with Steven Lindow. In 1995, she joined the faculty at Iowa State University[4] where she is currently the Robert Earle Buchanan Distinguished Professor of Bacteriology for Research and Nomenclature.[1] In 2020, she served as Interim Chair of the Department of Plant Pathology and Microbiology at Iowa State.[9]
Beattie participated in the American Academy of Microbiology's colloquium How Microbes Can Help Feed the World, published as proceedings in 2012.[5][10] As a leader of the Phytobiomes steering committee and the Phytobiomes Roadmap Writing Workshop held at the Samuel Roberts Noble Foundation in 2015, she helped to develop the term phytobiome, and to publish Phytobiomes: A Roadmap for Research and Translation (2016).[6][3][11][12]
Beattie is a strong advocate for increasing Congressional funding of scientific research in agriculture. She emphasizes the importance of developing plants that can better endure worsening growing conditions such as drought that are resulting from climate change. Such research is essential to combating food insecurity.[16] While broadly applicable, it is likely to be of particular important for the least developed countries.[5]
Beattie is internationally recognized for her work on the ecology of phytopathogenic bacteria and their use of environmental signaling. She has explored the ways in which plant leaves respond to environmental cues, and the genomics underlying microbial responses on and within plant leaves. Using the model organismPseudomonas syringae, she has studied bacterial perception of leaf surfaces and interiors.[4]P. syringae bacteria can be carried long distances by air currents, and live on leafy plants in a wide variety of environments and conditions.[17]
As she studied bacterial gene expression in different environments, she discovered that bacteria, like plants, contained light-sensing proteins.[17] By examining the transcriptome of P. syringae, her team has determined that one-third of its genes are affected by light. Her work has identified light, and in particular far-red wavelengths, as potentially important environmental signals in plant-colonizing microbes. The discovery that bacteria have signaling pathways for different wavelengths of light has illuminated an unexpected parallel between bacteria and plants.[4]
Beattie's research group has also discovered physiological mechanisms regulating the availability of water, that involve both host and pathogen. Water availability is a limiting factor for microbial growth. Using biosensors that they developed to assess the water status of individual cells, Beattie's group has shown that bacteria can experience low water availability deep within a plant, and that plants can limit water availability as a defensive response against bacteria.[4] The researchers have identified microbiome signatures that are characteristic of drought-stressed plants and the root microbiomes of many plant species.[4]
In addition, light-sensitive proteins affect gene expression in ways that help bacteria to survive periods of low water availability.[17] Using P. syringae to examine the interactions of light with photosensory proteins,[4] Beattie's research group discovered that bacteria were not only responding to changes in evaporation of morning dew on the leaves, they were anticipating them. By sensing light cues, bacteria were able to activate self-protective changes before warming of the leaves and evaporation of moisture occurred. This experimental work is among the first to clearly demonstrate that bacteria have developed anticipatory strategies to improve their survival.[17]
Beattie's group has developed a model organism with genetic tractability (the potential for genetic manipulation using genetic engineering), for bacterial wilt which is caused by Erwinia tracheiphila in Cucurbitaceae (gourds). By understanding bacterial wilt etiology, the researchers hope to develop ecologically based biocontrol management strategies for crops in the Midwest and Northeast U.S.[4]
Awards and honors
2018, Regents Award for Faculty Excellence, Iowa State University[18]
Beattie, GA; Lindow, SE (May 1999). "Bacterial colonization of leaves: a spectrum of strategies". Phytopathology. 89 (5): 353–9. doi:10.1094/PHYTO.1999.89.5.353. PMID18944746.
