- Author: Kathy Keatley Garvey
Today, during the 62nd annual international conference of the Society of Nematologists, being held July 9-14 in Columbus, Ohio, The Proceedings of the National Academy of Sciences (PNAS) published a UC Davis research team's important--and exciting--research paper on root-knot nematodes.
It's online at “Root-Knot Nematodes Produce Functional Mimics of Tyrosine-Sulfated Plant Peptides."
Basically, the researchers discovered that “both a harmful plant bacterium and a parasitic worm can mimic a plant peptide hormone to enhance their ability to infect plants.”
It's a joint project of nematologist Shahid Siddique, an associate professor in the Davis Department of Entomology and Nematology, and Siddique and UC Davis distinguished professor Pamela Ronald, a plant pathologist and geneticist in the Department of Plant Pathology and the Genome Center. They are the corresponding authors. Joint first-authors are Henok Zemene Yemer, formerly of the Siddique lab and now with Gingko Bioworks, Emeryville, and Dee Dee Lu of the Ronald lab.
It's like hijacking plant development to facilitate parasitism, according to Siddique. “This finding showcases an amazing case of convergent evolution across three different types of organisms, revealing how diverse life forms can develop similar strategies for survival.”
“Root-knot nematodes are a major threat to various crops, including fruit trees and vegetables,” Siddique said. “In California, tomatoes, almonds, and walnuts are among the major hosts susceptible to root-knot nematode infection.”
Siddique and UC Davis distinguished professor Pamela Ronald, a plant pathologist and geneticist in the Department of Plant Pathology and the Genome Center, are the joint corresponding authors. Joint first-authors are Henok Zemene Yemer, formerly of the Siddique lab and now with Gingko Bioworks, Emeryville, and Dee Dee Lu of the Ronald lab.
Plant-parasitic nematodes (PPNs) are among the most destructive plant pathogens, causing an annual economic loss of $8 billion to U.S. growers and more than $100 billion worldwide, the authors said.
The team also included emerita professor Valerie Williamson of the former Department of Nematology; Maria Florencia Ercoli, postdoctoral fellow in the Ronald lab; Alison Coomer Blundell, a doctoral candidate in the Siddique lab; and Paulo Vieira of the USDA's Mycology and Nematology Genetic Diversity and Biology Laboratory, Beltsville, Md.
“Plant peptides containing sulfated tyrosine (PSY)-family peptides are peptide hormones that promote root growth via cell expansion and proliferation,” the authors explained. “A PSY-like peptide produced by a bacterial pathogen has been shown to contribute to bacterial virulence. Here, we discovered that PSY-like peptides are encoded by a group of plant-parasitic nematodes known as root-knot nematodes. These nematode-encoded PSY mimics facilitate the establishment of parasitism in the host plant. Our findings are an example of a functional plant peptide mimic encoded by a phytopathogenic bacterium (prokaryote) and a plant-parasitic nematode (an animal).”
The project drew financial support from a collaborative grant awarded to Siddique and Ronald from the National Science Foundation's Division of Integrative Organismal Systems.
Siddique, a member of the UC Davis faculty since 2019, focuses his research on basic as well as applied aspects of interaction between parasitic nematodes and their host plants. “The long-term object of our research is not only to enhance our understanding of molecular aspects of plant–nematode interaction but also to use this knowledge to provide new resources for reducing the impact of nematodes on crop plants in California.”
Ronald, noted for her innovative work in crop genetics, especially rice, is recognized for her research in infectious disease biology and environmental stress tolerance. Thomson Reuters named her one of the world's most influential scientific minds and Scientfic American recognized her as among the world's 100 most influential people in biotechnology. In 2022 Ronald received the Wolf Prize in Agriculture.
The next steps? “Currently, we are working to understand the mechanism by which these peptides contribute to the nematode infection,” Siddique said. “This entails the characterization of receptors involved and gaining insights into transcriptional changes.”
- Author: Kathy Keatley Garvey
This year students in Carey's classrooms swept all three awards in the Science, Engineering and Mathematics (SEM) category of the 2023 Norma J. Lang Prize for Undergraduate Information Research.
Jenna Schafer won first place with a $1000 prize; Sarah Shores, second, $750; and Neha Gondra, third, $500. Maram Saada, a former student in Carey's longevity class who won the 2022 first-place SEM award, also won this year's Arts, Humanity and Social Sciences (AHSS) category.
Carey students are frequent winners, but this is the first year his students won all three awards in the SEM category. Since 2020, a Carey student has won eight of the 13 awards, including four consecutive first-place SEM awards.
The Lang Prize, launched in 2017 to encourage the use of library resources and to reward the best research papers, memorializes Norma J. Lang (1931-2015), professor emerita of botany, who taught at UC Davis from 1963 to 1991.
Shores submitted her paper on “Androgen Insensitivity Syndrome: Differences of Sex Development.”
Gondra's third-place paper, Evaluating the Influence of the Mediterranean Diet on Reducing Cardiovascular Disease Risk Factors in Obese Individuals, dealt with obesity.
The Basics. Carey, a member of the UC Davis faculty since 2008 and an international award-winning teacher, instructs his students how to research topics, use style sheets, and structure documents.
Carey tells his students that they need to consider their research term paper requirement, not as merely "a writing assignment," but as "a production concept" involving a number of writing concepts and components:
- Writing video series. Carey mandates that all his students view the 13-part video playlist he produced titled “How to Write a Research Term Paper.” The playlist—viewing time totals about an hour--covers technical aspects of term paper production, including best practices in word processing and typography as well as ethical writing (no plagiarism), researching, framing, drafting, editing, proofing and finalizing (Writing Instruction Playlist).
- Model papers. Just as all researchers can view example papers in journals, students also need models, too, Carey believes. He posts a term paper example, mocked up from his own writing, as well as links to all the award-winning student papers in the Lang Prize competition and such UC Davis student publications as Prized Writing and Aggie Transcripts.
- Technical fluency. Carey requires all students to learn best practices in both typography and word processing. Students must use exact 15-point spacing (not single or double), 11-point California FB typeface (not Times Roman), 1.5-inch page margins (for shorter lines) and, using style sheet tools, must create four formatting codes that cover 98 percent of the formatting—heading level 1, subheading level 2, body text and hanging paragraph. Submitted papers are not only technically uniform, but also possess an aesthetic beauty that Carey feels either consciously or sub-consciously inspires students to take pride of ownership that carries over to their efforts in other aspects of their paper. Carey requires his students to read and follow Butterick's Practical Typography.
Storytelling. Carey stresses storytelling as the overarching, unifying concept for writing a term paper, the basics of which are that the story must have structure (a beginning, a middle and an end), a voice (the student's) and character development (main theme or thread). The process of story development is inextricably linked to their paper development; once the story begins to form in a student's head and then on paper, the narrative flows more clearly, succinctly and with much less effort than a paper containing information “dumps.” - Writing and editing. Although Carey emphasizes the importance of producing clear, succinct and technically correct prose, he tells his students that this is only a part of the larger process concerned with a paper's structure and congruency.
Congrats to the first-place SEM winners from the Carey classrooms since 2020:
- 2020: Jessica Macaluso, “The Biological Basis for Alzheimer's Disease.”
- 2021: Barry Nguyen, “Allostasis: The Fundamental Biology and Implications for Social Standing and Longevity.”
- 2022: Maram Saada, “Huntington's Disease: Etiology, Research Models and Treatment.”
- 2023: Jenna Schafer, "Timeout with Torpor: History, Biology and Future Medical Applications of a Survival Strategy."
Carey's teaching methods shine light on what innovative, dedicated and detailed instruction can do to anyone struggling with "How do I write a term paper?"
And sometimes there's a monetary reward and campuswide recognition.
- Author: Kathy Keatley Garvey
Ever seen a honey bee packing red pollen?
Rock purslane (Calandrinia grandiflora) is one flower that yields red pollen.
It's a drought-tolerant perennial, a succulent. But the most striking part is its color: a neon pink that could stop traffic.
Other flowers that yield red pollen include henbit (Lamium amplexicaule) and horse chestnut (Aesulus hippocastanum).
Bees collect pollen as a protein source to rear their brood. If you're a beekeeper, you've probably seen the red pollen in your frames and asked "Where did that red come from?"
Some of it may have come from a nearby rock purslane.
- Author: Kathy Keatley Garvey
The seventh annual International Monarch Monitoring Blitz will take place Friday, July 28 through Sunday, Aug. 6.
That's when community scientists from across North America--United States, Canada and Mexico--will "come together with the shared goal of helping to protect and conserve the beloved and emblematic monarch butterfly," the organizers said. "Data collected by volunteers each year support trinational efforts to better understand the monarch butterfly's breeding productivity, range, and timing in North America."
So, during this 10-day period, we will look for monarchs, as well as eggs, caterpillars and chrysalids, and load the data via the Trinational Monarch Knowledge Network, "a central repository that, in combining data from various sources, assists researchers in performing large-scale temporal and spatial analyses. The data collected by volunteers help researchers answer key questions about monarch butterfly and milkweed distribution, timing of reproduction, and the use of natural resources. In turn, this information helps conservationists identify and prioritize actions to conserve the species."
Ready to participate? All you have to do is share your data with one of the community science programs below:
- Journey North (journeynorth.org)
- Mission Monarch (mission-monarch.org)
- Monarch Larva Monitoring Project (mlmp.org)
- Naturalista (naturalista.mx)
- Correo Real Program/PROFAUNA A.C. (https://www.correoreal.mx/)
- Western Monarch Milkweed Mapper (monarchmilkweedmapper.org)
The Blitz is organized by the Trinational Monarch Conservation Science Partnership, a collaboration of organizations, including the Commission for Environmental Cooperation, Insectarium/Montréal Space for Life, Environment and Climate Change Canada (ECCC), the Monarch Joint Venture, Journey North, the US Fish and Wildlife Service, the Xerces Society for Invertebrate Conservation, PROFAUNA AC/Correo Real Program, and Mexico's Comisión Nacional de Áreas Naturales Protegidas (Conanp).
Last year's effort resulted in 5988 observations, 2698 participants from 75 states and provinces, 19,222 monarchs observed, and 68,847 milkweeds examined.
Also, you can sign up for the Commission for Environmental Cooperation's newsletter here.
We remember that in 2016, our Vacaville pollinator garden thrived with 300 monarch eggs and caterpillars. The most exciting event? On Monday, Sept. 5, 2016 a citizen-tagged monarch fluttered into our yard from Ashland, Ore. This was part of a migratory monarch project headed by entomologist David James of Washington State University, my alma mater. Community scientist Steven Johnson of Ashland tagged it on Aug. 28, numbering it A6093.
"So, assuming it didn't travel much on the day you saw it, it flew 285 miles in 7 days or about 40.7 miles per day," James told us. "Pretty amazing. So, I doubt he broke his journey for much more than the five hours you watched him--he could be 100 miles further south by now." (See Bug Squad blog)
Now, to keep our eyes open for Danaus plexippus--the adults, eggs, caterpillars and chrysalids--during the July 28-Aug. 6 blitz.
Zero sightings in our yard so far this year!
- Author: Kathy Keatley Garvey
Where are all the monarchs? Not in our pollinator garden here in Vacaville.
Milkweed? Check.
Floral resources? Check.
Praying mantids? No. (Haven't seen any, but they're out there!)
Birds? Yes. (Nesting California scrub jays eat their fill of caterpillars, mainly Gulf Fritillary 'cats.)
Shade? Yes. (Crepe myrtles and cherry laurels await.)
Monarchs? No. (Danaus plexippus, where are you?)
On previous Fourths of July, monarchs fluttered, nectared, and eclosed in our pollinator garden.
Today, July 4, 2023, we celebrate our nation's birthday, and yes, it's "Hurrah for the Red, White and Blue!"
However, we are s-o looking forward to "Hurray for the Black and Orange!"