The Tea Bud Gene

December 29, 2025

Hello everyone,

It’s almost the end of 2025, and what a year it has been. For me, it has been a year of going from high highs to low lows, and repeat, but that’s life, right? I hope all of you have had some good memories to take with you into the year.

For Tea Journey, I wanted to close the year on a note of hope and promise. So, we close with the last article of 2025, a scientific one at that. Earlier in 2025, researchers at China’s Tea Research Institute identified the molecular switch controlling the tea bud size. In the article published in the Horticulture Research, the researchers describe how their findings enhance our understanding of the KNOX genes in tea plants and provide some references for uncovering the genetic regulatory mechanisms behind tea bud size.

If that sounds overwhelming and complicated, let me break it down for you. Scientists have uncovered the genes responsible for the bud size in Camelia sinensis. This is going to have a huge impact on tea breeding, helping build new varietals for different types of teas and enabling tea breeders to strike a balance between cup quality, climate resilience, environmental stress tolerance, and disease resistance, eventually also contributing to economic sustainability.

I break the research down further in my article, so do check it out. I am also sharing a little excerpt below, because I truly believe that this discovery holds the potential to change tea breeding in the future, and I really want all my readers to know more about it.

Going into the new year, I am going to share my list of the Top 10 articles from Tea Journey, a recap of 2025, launch our new issue (super excited about this), and share all about my trip to the tea lands in Darjeeling. I will also present a final recap of our Sri Lanka issue. I am truly thankful for all the love all our readers have shown us.

Do you have any story ideas that I should focus on, or maybe something you would like to share? Drop me a line, or just hit reply to this email.

Immensely thankful to all of you. Tea Journey would not be what it is without all of you. Wishing you a very happy 2026 in advance!

Yours in tea,

By Bhavi Patel

The Tea Bud Gene Making Waves In The Teacup

Discover how the scientists identified CsKNOX6, the master gene behind tea bud size—ushering in a new era of precision breeding, flavor control, and climate-smart cultivation.

Sharing an excerpt from the article, because this is a really significant discovery.

Decoding Tea Plant DNA: A Genetic Detective Story

The research team assembled an impressive collection: 280 distinct tea varieties representing wild ancestors, heritage cultivars, and contemporary hybrids. Using advanced digital imaging technology, they measured bud characteristics with remarkable precision across this diverse population.

The findings revealed extraordinary natural variation. Bud lengths spanned from under 1.5 centimeters to nearly 5 centimeters, while surface areas varied by almost five times. These measurements showed normal distribution patterns, suggesting multiple genes influence the trait—but some matter far more than others.

Heritability: Nature Over Nurture

Perhaps most importantly, the study demonstrated that bud dimensions show heritability rates between 60% and 90%. This means genetics, not growing conditions, primarily dictate bud size. A Yunnan variety maintains its characteristic large buds regardless of terroir, while Zhejiang cultivars keep their delicate proportions everywhere they’re planted.

For plant breeders, high heritability translates to predictability. Selecting for specific bud traits will reliably pass those characteristics to offspring, generation after generation.

Revolutionary Applications for Tea Breeding

Marker-Assisted Selection for the Tea Bud: Accelerating Traditional Breeding

Traditional tea breeding requires crossing desirable parent plants, then evaluating offspring phenotypes—a process demanding years per generation for perennial species. Marker-assisted selection accelerates this timeline by identifying superior genotypes at the seedling stage based on DNA markers, eliminating the wait for plants to mature.

The genetic marker linked to CsKNOX6 enables breeders to rapidly screen thousands of seedlings, selecting only those matching breeding objectives. For premium white or green teas requiring smaller, tender buds, breeders can select genotypes with active CsKNOX6. For black tea or high-yield cultivars benefiting from larger leaves, they can select for reduced CsKNOX6 activity.

This precision dramatically improves efficiency while reducing time and cost investments.

A New Chapter in Tea’s Ancient Story

From the misty mountains of Yunnan to the manicured tea gardens of Japan, Camellia sinensis has been humanity’s companion for millennia. Now, armed with knowledge of genes like CsKNOX6, we stand at the threshold of a new era in tea cultivation.

The identification of this molecular master switch does not diminish tea’s cultural significance or artisanal craftsmanship—it enhances our ability to preserve and perpetuate these traditions in an uncertain world. Whether you prefer the delicate complexity of white tea or the bold intensity of black, you are participating in an agricultural legacy now backed by precision genomics.

The next time you cradle a warm teacup, remember: the quality of that brew was determined long before harvest, written in the genetic code of a tiny gene controlling an even tinier bud. Science and tradition, working together, ensure your tea tastes as exceptional tomorrow as it does today.

There is another interesting article that we published a few weeks ago, which shares the research about the role of oxygen in fermentation during tea processing.

Oxygen Boost: The Science Behind Better Black Tea

Strategic oxygen treatment during black tea fermentation significantly improves taste profiles and liquor color quality through optimized processing methods. This scientific breakthrough offers tea producers, manufacturers, and sellers evidence-based methods to enhance their product quality through optimized fermentation processes.

So, that’s it from me today. If you aren’t already, please follow us on LinkedIn, Instagram, and YouTube.
It means a lot to us!

Until next time.

Bhavi Patel, Editor, Tea Journey Magazine

Bhavi Patel, known as Banjaran Foodie, is the editor of the Tea Journey Magazine and a distinguished tea and coffee expert with a background in dairy technology and brand building. As a trusted writer for renowned publications including Perfect Daily Grind, Barista, and STiR Magazines, she combines scientific expertise with storytelling to explore specialty beverages.

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Bhavi Patel

Bhavi Patel, known as Banjaran Foodie, is a distinguished tea and coffee expert with a background in dairy technology and brand building. As a trusted writer for renowned publications including Perfect Daily Grind, Barista, and STiR Magazines, she combines scientific expertise with storytelling to explore specialty beverages.