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As �°������ϲ���Ļ��Ϣ Davis’ biggest and most versatile classroom, the arboretum was made for weekends like this: a plant sale on Saturday, offering lessons in drought-tolerant landscaping; and “Walking in the Woods with Chemistry” on Sunday, launching an exhibit that will run through Dec. 7.

• Plant sale — This is the first of three sales this fall, all of them  celebrating 10 years of the , a collection of arboretum-tested plants that make for attractive, easy-care landscapes with low water needs.
 

ABIETIC ACID

This is one of the 13 molecules in the exhibit Walking in the Woods with Chemistry. Abietic acid is the major ingredient of pine resin and what sticks to your hands when decorating the Christmas tree.

Natural tree defense: When stem-boring insects attack the tree, pine resin flows out of the wound and traps the insect. Abietic acid also acts as an antibiotic, protecting the tree against invading fungi and bacteria.

Industrial uses: As a byproduct of the wood and paper industry, abietic acid is used in your printer ink, lubricants, paint thinner and linoleum.

Research at �°������ϲ���Ļ��Ϣ Davis: The Zerbe and Tantillo groups, and researchers around the world, study the biology and chemistry of this fascinating terpene compound to better understand its formation, protective properties and industrial uses.

WHERE IN THE ARBORETUM

You’ll find the exhibit in four of the arboretum’s collections:

“It’s an anniversary worth noting not just because it’s been a decade, but because of the impact the plants and overall program have had on the improvement in sustainability of our landscapes,” Ellen Zagory, director of horticulture, wrote in the latest edition of the arboretum’s newsletter.

Sale hours are 9 a.m. to 1 p.m. Saturday (Oct. 10) at the (it’s across from the Veterinary Medical Teaching Hospital on Garrod Drive, south of La Rue Road).

As usual with the first sale of the season, the first two hours are reserved for members of . You’re welcome to join at the gate or you can call ahead, (530) 752-4880; all members receive a 10 percent discount on plant purchases, and each new member also receives a $10-off coupon. The sale is open to the public from 11 a.m. to 1 p.m.

This season's other sales are scheduled for Saturday, Oct. 24, and Saturday, Nov. 14 (clearance sale), both open to the public, 9 a.m. to 1 p.m.

• Walking in the Woods with Chemistry — Brought to you by Dean Tantillo, professor of chemistry; Philipp Zerbe, assistant professor of plant biology; and Nhu Nguyen, a chemistry Ph.D. candidate.

The opening event, billed as a talk and tour, is set for 1 p.m. Sunday (Oct. 11) at the . Admission is free and open to the public, with all ages welcome.

Walking in the Woods with Chemistry is about molecules produced by plants, and how we use those molecules in our daily lives and how those molecules have inspired research at �°������ϲ���Ļ��Ϣ Davis and other universities.

The exhibit explores such questions as: Have you ever wondered what makes up the flavor of your wine? Or how a plant can cure cancer? What the smell is in your perfume? Or how a tree defends itself?

The exhibit comprises 13 molecules in multiple locations in the arboretum (see box). Each site includes a model of a molecule that comes from a nearby plant, and a sign identifying the molecule and its uses. Each sign also has a QR code leading you to more information.

The model-making started on a computer, using the same programs the researchers use in their labs, and ended with the models coming out of a 3-D printer. Each one is identified by Braille type.

‘The (bio)chemistry behind it all’

All of the molecules in the exhibit are also known as metabolites, which describes molecules that are part of biosynthetic pathways, i.e., the formation of chemical compounds by groups of enzymes.

Zerbe, who identified plants of interest for the exhibition, said: “My great motivation to join Dean and Nhu in this project is that we use plant-derived metabolites every day, but rarely recognize this fact. The arboretum is a fantastic place to showcase just how much our daily life depends on plants, and how researchers at �°������ϲ���Ļ��Ϣ Davis work together to better understand the (bio)chemistry behind it all.”

Tantillo and Zerbe described Nguyen as the “mastermind” behind “Walking in the Woods with Chemistry,” and she in turn credited Elaine Fingerett, the arboretum’s academic coordinator, for welcoming the idea and helping to make the project a reality.

Nguyen did her undergraduate studies at �°������ϲ���Ļ��Ϣ Davis, earning a Bachelor of Science degree in chemistry in the spring of 2012 and then joining Tantillo’s lab in the fall.

“Art has always been a big part of my life, and I hope this project illustrates a place where art meets science, as well as offering a glimpse into the many connections between science and nature,” Nguyen said.

She’s no stranger to the arboretum, having been on campus since 2008. On her walks and bike rides, she said, she’s collected “an arboretum photo collection that I’m very proud of.”

Tantillo also is on familiar ground: “This exhibit allows me to combine my interests in trees, molecules they produce and walking through the woods.”

(theoretical organic chemistry)

(unraveling plant metabolic diversity for improved human well-being)