A Deep Dive into Tissue Culture with Nathan Johnson

Cannabis tissue culture, plant genetics, micropropagation, and pathogen testing are transforming modern cultivation. In this episode of the Bioactive Podcast, Dr. Riley Kirk is joined by Dr. Nathan Johnson, President & CEO of Verne Bio, for a fascinating deep dive into one of the most powerful—and misunderstood—tools in cannabis cultivation.

Together they explore how tissue culture is helping preserve elite cannabis genetics, eliminate plant pathogens, improve cultivation consistency, and solve some of the industry's biggest challenges. Drawing from Dr. Johnson's extensive background in molecular biology, microbiology, bioinformatics, and plant science, the conversation breaks down how tissue culture works, why it's becoming essential for commercial cultivation, and what growers should know before adopting it.

The discussion also examines cannabis testing, microbial contamination, remediation methods, irradiation, and the science behind maintaining healthy plants without sacrificing quality. They unpack how beneficial microbes interact with cannabis, why current testing regulations remain controversial, and the differences between qPCR, culture-based testing, sequencing, and pathogen detection. The episode also explores THC testing variability, why cannabinoid percentages aren't always the best indicator of quality, and how cultivation practices influence the chemistry consumers ultimately experience.

Whether you're a home grower, commercial cultivator, cannabis scientist, breeder, laboratory professional, or simply curious about the future of cannabis science, this episode is packed with practical insights and evidence-based discussion.

CHAPTERS:

00:00 Welcome and Topic Setup

01:00 Nathan’s Background and Mission

01:59 Why Mother Plants Decline

03:28 Tissue Culture Origins and Bananas

04:39 Media and Hormones Explained

06:03 Meristem vs Node Methods

07:11 Sterile Lab and Decontamination