By WILLIAM MONTGOMERY
Milkweed plants are a common sight along country roads and in pastures. They’re an annoyance for many farmers, an endangered cause for environmentalists and the sole food source for Monarch butterfly caterpillars.
SUNY Cortland biologist Steven Broyles is part of a team that recently received $1 million to explore whether the plant also holds secrets that could help treat heart disease and cancer.
Broyles, professor and chairman of the biological sciences department, is a co-principal investigator of a $1 million Enabling Discovery Through Genomic Tools award, which was overseen by the National Science Foundation’s Biological Science Directorate.
Working with researchers at the Boyce Thompson Institute and Cornell University, Broyles will study the molecular and chemical ecology of two milkweed species, common milkweed, Asclepias syriaca, and tropical milkweed, Asclepias curassavica.
Here’s why that’s important: Milkweed plants produce toxins called cardenolides that deter pests. Monarch caterpillars ingest so many cardenolides that they have a natural immunity, and actually become toxic themselves to many predators.
Those same cardenolides may also play a role in fighting heart disease and cancer, Brolyes and other scientists suspect. By developing genetic maps of the milkweed plants,
Broyles and his colleagues hope to better understand where cardenolides are produced and ultimately how they may be used in medicine.
“All plants are marvelous chemical factories. They produce a diversity of chemicals,” Broyles said. “They have a variety of interactions with a mammal’s system. Some of them block sodium pumps in the heart tissue and the molecules are aligned with other well-known heart medicines, medicines that are used to treat heart failure. Knowledge of these pathways and these novel molecules could lead to new medical and pharmaceutical discoveries.”
Broyles, who specializes in pollination biology, will work to establish a genetic standard in the milkweed plants growing in the new campus greenhouse built adjacent to Bowers Hall.
“In order for this project to work, we have to create some inbred lines,” Broyles said. “That’s where I come in, trying to create the inbred lines. It simplifies the genetics by removing some of the variation.”
Principal investigator Georg Jander of BTI, a nonprofit focused on plant research and affiliated with Cornell University, is the project’s leader on genomics. Anurag Agrawal, a co-principal investigator, is a professor in Cornell’s department of ecology and evolutionary biology who specializes in plant-insect interactions. Lukas Miller, also a co-principal investigator, has worked to develop genetic databases for plant life at BTI.
The three-year grant will allow Broyles to hire undergraduate students to assist with his greenhouse research during the summer months, including one student who will go to Cornell each summer to help with the genomic portion of the research.
Broyles also wants students to document parts of the research project on video to encourage teachers to incorporate milkweed lessons and experiments in their classes.
Results of the team’s research will be posted to www.milkweedbase.net, now under construction, so scientists around the world can digest the data.
Broyles said that there are two to three billion nucleotides, the building blocks of DNA and RNA, in each of the more than 100 varieties of milkweed. Mapping and understanding the genomics of the plant will be painstaking, but Broyles can’t wait to get started. The possibilities are endless.
“There’s no way to quickly and completely understand all that,” Broyles said. “There is a lot of research to be done. The avenues for investigation continue to broaden as new technologies become available. Ten years ago, we couldn’t do this.”
William Montgomery is the assistant communications director for SUNY Cortland.