KYRA A. PRATS

I am a plant ecophysiologist interested in the structure and function of plants and how they respond to their environment. To study the coordination of water transport and photosynthesis under environmental stress, I use a variety of methods—from gas exchange and hydraulics, to microCT and epi-illumination fluorescence microscopy. It is vital to understand the physiology of photosynthesis and water movement in plants in order to solve applied problems of plant water use efficiency in a changing climate.

I completed my Ph.D. from the Yale University School of the Environment where I worked with the Brodersen Lab and was also a New York Botanical Garden Fellow. I am currently a Postdoctoral Researcher at Purdue University working with the Furze Lab.

I am passionate about science writing, science communication, and outreach!

Research

Plants perform photosynthesis, the process of converting carbon dioxide and water into sugars and oxygen. Sugars are ultimately used for other reactions in plants and in respiration, so the plants need to maintain a positive carbon balance. Since water is a necessary component of photosynthesis, water transport throughout the whole plant is essential for ultimately maintaining a positive carbon gain. Environmental stressors, like drought or cold temperatures, can disrupt water movement in the xylem, and I study how plants respond to such environmental stress.

Measuring chlorophyll fluorescence with the LI-COR 6400

Christmas fern frond. The vascular bundles (xylem and phloem) are flexible and can even be tied into loops! Scale bars = 1 cm

Christmas fern field site at Yale Myers Forest

Christmas ferns develop a hinge zone in the winter at the the base of the leaf, so the leaves lie flat in the winter. But xylem bundles remain intact! Scale bars 50 µm.

MicroCT image of a hydrated resurrection fern stipe cross-section

Epiphytic resurrection ferns fronds: desiccated (left) and hydrated (right)

MicroCT image of a desiccated resurrection fern stipe cross-section

MicroCT scanning at the Lawrence Berkeley National Lab beamline to get X-ray images. There's a fern in the little tube with an orange cap!

I worked with ferns, as they can serve as crucial bio-indicators of drought and climate change in many ecosystems, and studying their ecophysiology can provide insight into how they cope with changing climates. Woody plants have an advantage here for performing photosynthesis because they can grow taller to access light, and put on more wood (xylem) that transports more water. Ferns don’t have woody growth and can’t grow taller like trees. They are often stuck in shady, less desirable habitats beneath tree canopies. One way that ferns try to access more light is by growing in the canopies/branches of other trees—this growth form is called an epiphyte, and there are many fern species that are epiphytic. However, being epiphytic and growing on the branches of trees presents a whole other set of difficulties. There is no connection to the soil, so conditions are generally dry, and epiphytic ferns often have to use more creative ways to access and take up water. Physiologically, how do ferns deal with these habitats and environmental stressors that affect water transport and photosynthesis?

I have worked with the wintergreen Christmas fern (Polystichum acrostichoides) and an epiphytic resurrection fern (Pleopeltis polypodioides). These plants are remarkably robust!

Publications

*Co-first authors

Bouda, M., B. Huggett, K. A. Prats, J. Wason, J. P. Wilson, and C. R. Brodersen. 2022. Hydraulic failure as a primary driver of xylem network evolution in early vascular plants. Science. 378(6620): 642-646. doi:10.1126/science.add2910.

Prats, K. A., C. R. Brodersen. 2021. Desiccation and rehydration dynamics in the epiphytic resurrection fern Pleopeltis polypodioides. Plant Physiology. https://doi.org/10.1093/plphys/kiab361.

Prats, K. A., C. R. Brodersen. 2020. Seasonal coordination of leaf hydraulics and gas exchange in a wintergreen fern. Annals of Botany Plants. https://doi.org/10.1093/aobpla/plaa048.

Prats, K. A., C. R. Brodersen, and M. S. Ashton. 2019. Influence of dry season on Quercus suber L. leaf traits in the Iberian Peninsula. American Journal of Botany. https://doi.org/10.1002/ajb2.1280.

Prats, K. A., Roddy, A. B., and Brodersen, C. R. Stomatal behavior and water relations in xeric and mesic ferns. In Preparation.

*Rowland, F. E., *Prats, K A., Alshwairikh, Y. A., Burak, M. K., Fanton, A. C., and Duguid, M. C. Towards a new stable state: Equitably assessing trainee writing productivity post-COVID-19. In Review at BioScience.

*Alshwairikh, Y. A., *A. C. Fanton, K. A. Prats, M. K. Burak, M. C. Duguid, and F. E. Rowland. Multi-level strategies for improving trainee scientific writing habits. In Preparation.

Carlson Mazur, M.L., K. A. Prats, S. Antonelli, K. Kowalski, S. Mackey, and J. Schaeffer. Understanding interactions between hydrogeomorphic structure and wetlands in Great Lakes rivermouth ecosystems. In Preparation.

Communication & Outreach

I am passionate about science communication and outreach. I have earned a Public Communication Certificate through Yale's Poorvu Center for Teaching and Learning. As part of that program, I competed in Yale's 3 Minute Thesis competition to communicate my dissertation to a general audience within 3 minutes (video linked above). I am also part of a newly founded Yale Graduate School podcast project working to develop a podcast series on research communication.

In 2019 I co-organized the Yale School of the Environment (YSE) departmental Research Conference. In addition to organizing the conference sessions and inviting keynote speakers, we worked with Yale Pathways to Science to bring local New Haven high school students to attend the conference and interact with the research community at YSE.

I participate in Yale Open Lab's outreach events, such as the Science Haven Events to lead demonstrations of simple experiments to elementary school kids in New Haven. I have also mentored women through Yale's Women in Science (WISAY) mentoring program, and mentored undergraduate research assistants in Spain.

Teaching

Lead instructor: Ecosystem Science Module (August 2016 & 2017)
- Co-leader of the three-week orientation program for 150 incoming master’s students at Yale Myers Forest
- Redesigned curriculum, prepared and coordinated logistics for the orientation, delivered lectures, led field exercises
Teaching Fellow positions:
- Tropical Field Botany (Spring 2017, Spring 2019)
- Trees and Environmental Biology (Fall 2015, Spring 2018)
- Plant Ecophysiology (Fall 2018)
- Ecosystems and Landscapes (Fall 2016)
- The Practice of Silviculture (Spring 2016)