Most of us think new crop horticulture cultivars are invented behind closed doors, then handed to farmers as a finished product. We wanted to explore that assumption, so we sat down with Dr. Ambar Carvallo Lopez, currently a Post Doctoral Research Associate at the University of British Columbia and an ASHS award-winning author and plant breeder whose work shows how research progresses when growers and consumers Participate in the science. If you care about better-tasting tomatoes, resilient organic agriculture, and the future of local food systems, this conversation connects the dots from seed to plate.

In this episode we walk through the concept of participatory plant breeding, where farmers are involved early to define breeding objectives and then help shape selection by trialing lines on their farms. This is a unique form of citizen-science.

Ambar shares how the University of Wisconsin-Madison, Where she completed her PhD, tomato breeding program uses iterative seed exchange and real-world feedback to shorten the “will this work on my farm?” gap that often slows adoption. Along the way, we talk about genotype by environment interactions, high tunnel production, and why building trust with stakeholders can be as important as collecting data.

Ambar explains why tomato flavor may have declined over time as breeding programs prioritized yield, disease resistance, and plant structure, and how accessing heirloom tomato diversity can help recover the genes and volatile compounds tied to better aroma and taste. In the conversation also digs into practical breeding targets for organic systems, including foliar diseases like Septoria leaf spot and early blight, plus the behind-the-scenes reality of deciding when a line is ready to release and how to handle credit and IP when farmers are true co-creators.

If you finish this episode thinking differently about what’s behind a great tomato, share it with a friend, subscribe for more horticultural science, and leave a review so more listeners can find the show.

Read "Improved Tomato Breeding Lines Adapted to Organic Farming Systems Have Enhanced Flavor, Yield, and Disease Resistance", winner of the 2025 ASHS Outstanding Vegetable Publication Award. https://doi.org/10.21273/HORTSCI17799-24

Send us Fan Mail

Learn more about the American Society for Horticultural Science (ASHS) at https://ashs.org/.
HortTechnology, HortScience and the Journal of the American Society for Horticultural Science are all open-access and peer-reviewed journals, published by the American Society of Horticultural Science (ASHS). Find them at journals.ashs.org.

Consider becoming an ASHS member at https://ashs.org/page/Becomeamember!

You can also find the official webpage for Plants, People, Science at ashs.org/plantspeoplesciencepodcast, and we encourage you to send us feedback or suggestions at https://ashs.org/webinarpodcastsuggestion.

Podcast transcripts are available at https://plantspeoplescience.buzzsprout.com.

On LinkedIn find Sam Humphrey at linkedin.com/in/samson-humphrey. Curt Rom is at https://www.linkedin.com/in/curt-rom-611085134/. Lena Wilson is at https://www.linkedin.com/in/lena-wilson-2531a5141/.

Thank you for listening!

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A sunrise ride to an apple orchard changed everything for Dr. Gina Fernandez—and it might change how you think about berries. We sit down with the NC State distinguished professor and berry breeder to trace the path from cold-hardy apple rootstocks in Minnesota, to thornless blackberries in Arkansas, to a career defining strawberries, raspberries, and blackberries across the Southeast. Along the way, Gina reveals what makes a cultivar truly stand out: not just yields or firmness, but flavor that keeps people coming back.

Gina explains how she first joined NC State to tackle cultural management and methyl bromide alternatives, then stepped into breeding as the program shifted. We dig into the trials that helped launch a North Carolina blackberry industry, why thornlessness and resistance to double blossom were pivotal, and how later threats like orange rust and fusarium reshaped goals. On strawberries, she unpacks the split between shipping acreage and local pick-your-own farms, and more. We also talk about berry varieties Gina and her team have released over the years, specifically the blackberry 'Von' and the raspberry 'Nantahala', as well as the upcoming release of her new blackberry, NC740, to be called 'Ervin'.

Beyond genetics, Gina shares how science moved from solo wins to team science, and how she mentors through “Team Rubus” with weekly cadence, trust, and room for students to grow. Expect practical wisdom for early‑career researchers: travel to see different systems, build writing muscle, and collaborate across pathology, entomology, breeding, and economics to solve real grower problems. If you care about berry breeding, flavor, disease resistance, and how ideas become fruit on the table, this conversation delivers a full plate.

Additional information is available in these articles:

HortScience "'Von" Thornless Blackberry": https://journals.ashs.org/view/journals/hortsci/48/5/article-p654.xml

HortScience article, "'Nantahala' Red Raspberry" is available at https://journals.ashs.org/view/journals/hortsci/44/1/article-p25.xml

There are also many other relevant ASHS Journal articles available

Send us Fan Mail

Learn more about the American Society for Horticultural Science (ASHS) at https://ashs.org/.
HortTechnology, HortScience and the Journal of the American Society for Horticultural Science are all open-access and peer-reviewed journals, published by the American Society of Horticultural Science (ASHS). Find them at journals.ashs.org.

Consider becoming an ASHS member at https://ashs.org/page/Becomeamember!

You can also find the official webpage for Plants, People, Science at ashs.org/plantspeoplesciencepodcast, and we encourage you to send us feedback or suggestions at https://ashs.org/webinarpodcastsuggestion.

Podcast transcripts are available at https://plantspeoplescience.buzzsprout.com.

On LinkedIn find Sam Humphrey at linkedin.com/in/samson-humphrey. Curt Rom is at https://www.linkedin.com/in/curt-rom-611085134/. Lena Wilson is at https://www.linkedin.com/in/lena-wilson-2531a5141/.

Thank you for listening!

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Think a great wine grape can’t survive where winters drop to minus forty? We sit down with breeder Dr. Harlene Hatterman-Valenti from North Dakota State University to unpack how a young industry, a focused research program, and some stubborn optimism produced two new cultivars built for the northern plains. From the early days of variety trials and policy hurdles to the release of Dakota Primus and Radiant, Harlene shares how hybrid genetics, gritty selection, and clever management turned a hostile climate into an advantage.

We dig into the science of cold hardiness: why photoperiod sensitivity matters more than you think, how vines must read shortening days to lay down periderm before sudden freezes, and the three critical windows where cold injury strikes—fall acclimation, deep midwinter lows, and late-winter temperature whiplash. Harlene explains the growth calendar for a North Dakota vineyard with just 130 frost-free days, from delayed pruning and cautious budbreak to early-August veraison and mid-September harvests.

Beyond the vineyard, we explore how the state’s wine scene found its footing, why regulations evolved to support consistent supply, and how tourism now fuels growth. The conversation closes with what’s next: chasing an ultra-cold-hardy red, expanding into table grapes for farmers markets, and celebrating the team effort—students, specialists, and collaborators—that made progress possible. If you’re curious about cold-climate viticulture, breeding under polar vortex pressure, or how science builds regional wine identities, this one’s for you.

Additional information in available in these articles:

Complex Plant Process Trait Evaluation Through Decomposition of Higher-order Interaction: A Case Study in Acclimation Responses of Cold-climate Hybrid Grapevine Through Bilinear and Multiway Methods

Cold Climate Winegrape Cultivar Sensitivity to Sulfur in the Northern Great Plains Region of the United States

‘NDMutant1’: A Novel Determinate Interspecific Grapevine for Genetic and Physiological Study and Breeding Applications

Enjoyed the conversation? Follow the show, share it with a friend, and leave a review to help more growers and wi

Send us Fan Mail

Learn more about the American Society for Horticultural Science (ASHS) at https://ashs.org/.
HortTechnology, HortScience and the Journal of the American Society for Horticultural Science are all open-access and peer-reviewed journals, published by the American Society of Horticultural Science (ASHS). Find them at journals.ashs.org.

Consider becoming an ASHS member at https://ashs.org/page/Becomeamember!

You can also find the official webpage for Plants, People, Science at ashs.org/plantspeoplesciencepodcast, and we encourage you to send us feedback or suggestions at https://ashs.org/webinarpodcastsuggestion.

Podcast transcripts are available at https://plantspeoplescience.buzzsprout.com.

On LinkedIn find Sam Humphrey at linkedin.com/in/samson-humphrey. Curt Rom is at https://www.linkedin.com/in/curt-rom-611085134/. Lena Wilson is at https://www.linkedin.com/in/lena-wilson-2531a5141/.

Thank you for listening!

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