Alex Haus

From Wartburg to Iowa State. Not a long journey if you know what a Wartburg is! Alex Haus, the third member of our 2026 REU class, is a student at Wartburg.

For you non-Iowans, Wartburg is a small liberal arts college in Waverly, Iowa (Learn more about Wartburg). We are so pleased to note that Alex is a returning Research Undergraduate Intern. His experience last year proved so valuable that he is now back to gain even more knowledge from his RegenPGC mentor team. (Learn more about Alex’s 2025 summer)

ALEX HAUS – WARTBURG COLLEGE

Brief Bio. I am currently a junior at Northern Arizona University studying Mathematics and Secondary Education with the goal of becoming a high school math teacher. I grew up in Gilbert and later moved to Flagstaff to attend college. Alongside school, I am also a licensed hairstylist and enjoy doing hair part-time while pursuing my degree.

I recently began my practicum experience, where I have worked in both science and math classrooms, which has strengthened my passion for teaching and working with students.

Outside of academics and work, I enjoy watching movies and TV shows, working out, and spending quality time with friends and family. Something unexpected about me is that even though I am a huge math enthusiast, geometry is actually my least favorite area of math.

Why I applied… I applied again to meet new people and build meaningful connections, because last year I met some amazing individuals and had a truly positive experience. Last time, the program provided me with valuable knowledge, new perspectives, and strong relationships, and I am hoping to continue building on that experience. I want to keep growing by learning from others, challenging myself in a new environment, and gaining skills that will support me throughout my college experience and future career.

My expectations for the REU program include… My expectations for the summer RET/REU program include gaining hands-on research experience, building meaningful connections, and finding opportunities to thrive in a new and challenging environment. I want to push myself to grow both personally and academically while learning from others and developing skills that will support me in my future career in education.

From Arizona to Iowa: Meet Kaylee

Kaylee Johnson

From sunny and DRY Arizona to humid Iowa can be a bit of schock in the summer, but having met 2026 Research Undergraduate Intern and future math teacher Kaylee Johnson, we are sure she will take the change in stride.

Kaylee comes to Iowa State University from Northern Arizona University. Here at ISU, Kaylee will work with RegenPGC Collaborator, Dr. Richard Roth and the staff at the Iowa State University Biotechnology Outreach Education Center. We look forward to an excellent summer experience for Kaylee and the entire REU class!

Meet Research Intern Kaylee Johnson

Brief Bio.  I am currently a junior at Northern Arizona University studying Mathematics and Secondary Education with the goal of becoming a high school math teacher. I grew up in Gilbert and later moved to Flagstaff to attend college. Alongside school, I am also a licensed hairstylist and enjoy doing hair part-time while pursuing my degree. I recently began my practicum experience, where I have worked in both science and math classrooms, which has strengthened my passion for teaching and working with students.

Outside of academics and work, I enjoy watching movies and TV shows, working out, and spending quality time with friends and family. Something unexpected about me is that even though I am a huge math enthusiast, geometry is actually my least favorite area of math.

Why I applied… I applied because I wanted the opportunity to explore science in a deeper and more hands-on way. I have always enjoyed physics and even considered minoring in it at one point. I believe this program will help me expand my knowledge and experience within the science field while also strengthening my background as a future math educator.

Math and science naturally connect, and participating in science-based research will allow me to bring more real-world applications and interdisciplinary learning into my future classroom. I am excited to challenge myself, grow academically, and gain experiences that will help me become a more well-rounded educator.

My expectations for the REU program include… My expectations include gaining new knowledge, experiences, and friendships while growing both personally and academically. I hope to learn more about the science field and discover new ways I can apply research and problem-solving skills to my future classroom. I also want to step outside of my comfort zone, contribute meaningfully to the program, and make the most of the opportunity while enjoying the experience along the way.

From North Carolina to ISU – Meet Preston

Preston Marrable

It’s summer, and we welcome another class of Undergraduate Research Interns. This year we have three interns. Today, meet Preston Marrable from North Carolina Agricultural and Technical State University. Preston will be working with RegenPGC CoPD Dr. Shuizhang Fei.

Preston’s goals for the summer are to “gain more knowledge and strengthen my work ethic and attention to detail. As much as I want to improve on a professional level, I also want to build friendly relationships with my fellow peers.”

We are pleased to welcome Preston to Iowa State University,  where we know he will learn a lot with Dr. Fei!

Meet Preston Marrable

Brief Bio. I grew up in Los Angeles while moving around Southern California as a kid. I currently live in North Carolina, and I attend North Carolina Ag & Tech State University as a rising junior. My favorite subjects are English and History. My personal hobbies are cooking, exercise, and listening to music. Something unexpected about me is that I went to Japan last year, and I enjoyed every minute of it.

Why I applied… I applied to the program because I want to gain research experience in STEM and mathematics. I also want to gain professional insight and experience by building a coalition of connections among my Iowa State colleagues before, during, and after the program has finished.

My expectations for the REU program include… I want to gain more knowledge and strengthen my work ethic and attention to detail. As much as I want to improve on a professional level, I also want to build friendly relationships with my fellow peers.

Welcome, Gabriel!

We are excited to welcome a new member to the RegenPGC team, Gabriel J. Gabriel comes to our project from The Land Institute, where he is a new Agronomical Data Scientist. Gabe joins the Land Institute to help advance their Perennial Legume program into a more fully data-enabled platform by building systems for data curation and long-term accessibility, developing web-based tools for analysis, and enabling real-time, decision-driven insights. 

At RegenPGC, he will apply those skills to working witho ur team, especially members of the Graduate Education Community.

He brings valuable experience from Corteva Agriscience, where he worked as a Research Investigator on the Cropping Systems team and collaborated with Bo Meyering and the broader RegenPGC initiative to develop data management systems and image analysis models. Gabe also holds a master’s degree from Oklahoma State University. The Land Institute says, “We are thrilled to have him on the team and look forward to the impact his modeling and data science expertise and manuscript preparation will have on accelerating our work”

Moro, Franklin honored with Fellowships

Two members of our RegenPGC Graduate Education Community, Amina Moro and Rickiel Rodrigues Franklin da Silva have been named recipients of Iowa Crop Improvement Association Graduate Fellowships for the fall 2026 semester. Learn more about these awards click here.

Amina and Rickiel are working to advance the science involved in developing perennial ground cover systems. The entire RegenPGC team is very proud of the incredible work produced by the Graduate Education Community.

These fellowships, from the  Iowa Crop Improvement Association support graduate students whose research contributes to advancements in seed science, crop improvement, and agricultural innovation.

Malcolm Yusuf St Cyr completes his Master’s degree

Malcolm Yusef St Cyr Headshot

Today, we congratulate RegenPGC Graduate Education Community member Malcolm Yusuf St Cyr for his successful thesis defense and completion of his Master’s studies at Iowa State University under the mentorship of RegenPGC CoPd Dr. Marshall McDaniel. Learn more about Malcolm’s thesis, Perennial ground covers: A mitigation strategy to nitrous oxide (N₂O) emissions for maize cropping systems, at www.regenpgc.org/wp-content/uploads/2026/05/2026-05-19-StCyr-OFFICIAL-THESIS.pdf

ABSTRACT
Agricultural intensification in the U.S. Midwest has led to widespread of nitrogen (N) losses through nitrate (NO₃⁻) leaching and nitrous oxide (N₂O) emissions, two processes that threaten water and atmospheric quality. Traditional winter cover crops (WCCs) have proven to be effective in reducing NO₃⁻ leaching but remain limited in adoption due to economic and management challenges. Perennial ground cover (PGC) systems integrate non-leguminous perennial grasses in between annual row crops offering a potentially optimized alternative that maintains continuous soil cover without requiring annual replanting. However, their influence on soil nitrous oxide emissions and soil nitrogen and carbon pools remain poorly explored. In this study we used three PGC treatments: 1) Zea mays L. without PGC (Maize Control), 2) maize with Poa bulbosa, a summer-dormant grass commonly called bulbous bluegrass (Maize+BBG), and 3) maize with Poa pratensis, or Kentucky bluegrass (Maize+KBG) to analyze the impact of PGC on N₂O emissions and soil N and C pools. Both PGC treatments reduced interrow cumulative N₂O emissions by 38–81% relative to the control in both years (p < 0.01), although row-position emissions were more variable and influenced by fertilizer placement. Despite these consistent interrow reductions, field-level cumulative N₂O emissions were not significantly different among treatments in either year. Overall, our results indicate that PGC does not affect field-level soil N₂O emissions, while maintaining similar levels of plant-available N, and had no effect on maize yield.

New RegenPGC publication hits the “Streamosphere”

Chart

RegenPGC Ph.D. student Memiş Bilgici, joined by RegenPGC colleagues Sara Lira, Lucas Borras, Ken Moore & Thomas Lübberstedt, has authored a new academic publication for the academic journal Frontiers in Plant Science.

The article, Trends in stomatal density and size in maize hybrids representing 100 years of long-term breeding for yield* highlights four main research findings:

  • Modern hybrids had higher stomatal density but lower total stomatal pore area than historical hybrids.
  • Across 27 Pioneer hybrids, stomatal density was negatively correlated with stomatal size, length, width, and leaf area.
  • Over the past 100 years, the total stomatal pore area on leaves decreased, while stomatal density increased as leaf area declined, revealing a connection between these two patterns.
  • Total stomatal pore area was negatively correlated with release-year atmospheric CO2 concentration and temperature anomaly (°C) over the past century.

According to Memiş, “To the best of our knowledge, this is the first crop-focused study to show century-scale changes in stomatal traits associated with long-term maize breeding for yield.”

*Bilgici, Memiş, Ebrahimi, Elnaz, Prada de Miranda, Leticia, Lira, Sara, Borras, Lucas, Young, Thomas, Yavuz, Recep, Moore, Kenneth J., Dixon, Philip, & Lübberstedt, Thomas. (2026). Trends in stomatal density and size in maize hybrids spanning 100 years of long-term yield breeding. Front. Plant Sci., 17:1829321. https://doi.org/10.3389/fpls.2026.1829321

New research informs how corn and perennial groundcover can coexist

Amina Moro in the lab

Today, we honor RegenPGC Graduate Education Community member Amina Moro and her work on corn’s “Shade Avoidance Response.” Iowa State University – College of Agriculture and Life Sciences recognized Amina’s work by featuring her in the article, “New research shows finding the ‘sweet spot’ is key to successful groundcover systems.” See: https://www.cals.iastate.edu/news/2026/new-research-shows-finding-sweet-spot-key-successful-groundcover-systems

Amina’s work informs how corn behaves when perennial groundcover is located in proximity to it. As the article specifies, “The practical applications of this research are clear. By maintaining a small buffer zone – around 25 centimeters – farmers can prevent early stress signals in corn while still benefiting from soil protection.”

According to Amina, “Farmers do not have to choose between improving soil health and maintaining yield,” Moro said. “With the right combination of spacing, hybrid selection, and management practices, it is possible to design systems where corn grows efficiently while the soil remains protected.”

Learn more about the science behind Amina’s work in her recently published paper in the Journal of Agronomy, “Spatial Proximity to Perennial Groundcover Triggers Shade Avoidance Responses in Corn” (https://www.mdpi.com/2073-4395/16/7/729).

It’s raining awards!

Memis Bilgici Award

They keep coming! Here is another award for a member of our RegenPGC Graduate Education Community. This time, it’s Memiş Bilgici who received an Iowa State University Research Excellence Award (REX).

Per the University, the award’s purpose is to “[…] recognize outstanding research accomplishments as documented in their dissertations. These students are also expected to be academically superior and able not only to do research but also to develop a well-written product. The intent of REX program is to recognize “the best of the best” graduating students who have submitted theses and dissertations.”

Congratulations to Memiş and his supervisor, Prof. Thomas Lübberstedt this significant achievement and recognition.

From Memiş: “I am deeply grateful to my supervisor, Prof Thomas LübbLübberstedtd to the RegenPGC community, with whom I have had the privilege to collaborate. I am proud of what we have accomplished together and excited to continue learning, building, and contributing to sustainable maize breeding, perennial ground cover systems, and controlled environment phenotyping.”

Summer research experience leads to growth

2025 REU Kylie Buchholz presents her research

One of our success stories at RegenPGC is our participation in Iowa State University‘s summer Research Experience for Undergraduates / Research Experience for Teachers programs. Each spring, Wartburg College hosts RICE Day, where students share research, internships, and creative endeavors they have completed. This past summer, I participated in the REU program and had the opportunity to work on Cameron Krumm’s research in Dr. Shuizhang Fei’s lab. Here is an update from Kylie Buchholz, a Wartburg student and a summer 2025 REU participant.

“After completing the REU, I presented this research at RICE Day this spring. This was a valuable opportunity for me that allowed me to share my experience with a wide range of faculty, students, and community members.

This engaged audience was deeply interested in my experience in the program. They were specifically interested in learning how this research connected to my future career in education. I was able to share multiple different lessons that I learned from my experience, many of which relate to the type of culture I want to create in my classroom.

By participating in this REU, I learned that having a positive attitude and cultivating a supportive community is essential for quality work to be produced. Additionally, this experience reinforced the importance of collecting many different data points before drawing a conclusion. These same things that I learned by participating in the REU are things that I will need to remember when I am shaping what I want my classroom to look like. Presenting the research I worked on this past summer at RICE Day was a great experience for me because it pushed me out of my comfort zone, helped me to reflect on what I want my classroom to be like, and allowed me to share this incredible research with those around me.”