Polyphenol deposition in pistachios - what is it, and how do cultivar and irrigation influence it?

Polyphenol deposition in pistachio kernels, also known as internal kernel discoloration, is a harmless phenotype of pistachios, where dark coloration appears on the internal surface of the pistachio cotyledons (the two halves of the kernel). It started showing up widely in the late 2010s/early 2020s, and researchers Georgia Drakakaki, Phoebe Gordon, and Minmin Wang have been investigating it from different angles (Phoebe from the field perspective; Georgia and Minmin from the anatomical and physiochemical perspective). In this episode, they share some initial results. We still don’t know what truly causes it, but we have some answers to basic questions. Episode transcript The views, thoughts, and opinions expressed are the speaker’s own and do not represent the views, thoughts, and opinions of the University of California. The material and information presented here is for general information purposes only. The "University of California" name and all forms and abbreviations are the property of its owner and its use does not imply endorsement of or opposition to any specific organization, product, or service.

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Polyphenol deposition in pistachios - what is it, and how do cultivar and irrigation influence it? is an episode from Growing the Valley by Phoebe Gordon.

This episode is 00:31:58 long.

This episode was published on Apr 1, 2026.

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