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Tomato Revolution: New Varieties Promise Resilience and Flavor Without Pesticides

For decades, tomato growers have faced a difficult choice: prioritize resilience against devastating pests and viruses, or focus on producing fruit that meets market standards for size and appearance. Now, a breakthrough from the World Vegetable Center (WorldVeg) is poised to change that, offering tomato varieties that combine robust resistance to whiteflies and the viruses they carry with commercially viable fruit quality.

The Whitefly Challenge and the Cost of Control

Whiteflies are a major threat to tomato production globally, transmitting viruses like the Tomato Yellow Leaf Curl Disease (TYLCD). Outbreaks can lead to significant yield losses, with global economic impacts already reaching hundreds of millions of dollars annually when factoring in lost yields, reduced fruit quality, and the expense of managing infestations. As growing conditions shift and temperatures rise, controlling whitefly populations is becoming increasingly difficult.

A Decade of Breeding for Dual Resistance

WorldVeg launched an ambitious breeding program over ten years ago, aiming to develop tomatoes resistant to both viruses and the whiteflies that spread them. “For a long time, seed companies and tomato farmers were faced with a trade-off – resilience or market quality. Now we have both in the same tomato, and that’s a huge breakthrough for everyone involved,” said Assaf Eybshitz, leader of the WorldVeg tomato breeding program since 2022.

Harnessing Wild Relatives for Natural Resistance

The key to this success lies in the genetic diversity found in wild tomato relatives, specifically Solanum galapagense. Some of these wild varieties possess a natural defense mechanism: a dense layer of tiny leaf hairs, called glandular trichomes, that secrete sticky compounds. These compounds deter whiteflies, hindering their ability to feed, settle, and reproduce.

Breeders used marker-assisted selection – a technique that utilizes DNA markers to identify and track desirable traits – to isolate this resistance and introduce it into elite tomato breeding lines. Through successive generations of crossing and selection, they were able to retain the resistance while simultaneously improving fruit size and appearance. The program also focused on developing resistance to tomato yellow leaf curl viruses, a major component of the whitefly-transmitted disease complex.

From Lab to Field: Rigorous Testing for Real-World Performance

The development process didn’t stop in the lab. WorldVeg conducted extensive field trials to evaluate the performance of the new tomato lines under real-world farming conditions. These trials spanned different seasons, climates, and production systems to ensure the resistance remained stable and fruit quality remained consistent outside of controlled environments.

Accelerating Access to Farmers Through Collaboration

WorldVeg is now accelerating the path to market through the APSA-WorldVeg Vegetable Breeding Consortium, a public-private partnership. This consortium allows seed companies to access the dual-resistant tomato seeds, conduct trials in their target regions, and further refine the lines to meet local needs and maximize yield and fruit quality. The overarching goal is to develop competitive commercial hybrids and deliver them to farmers worldwide.

The Potential for a More Sustainable Future

This breakthrough has significant implications for the future of tomato production. By reducing the need for chemical pesticides, these new varieties offer the potential for more sustainable farming practices, improved profitability for growers, and reduced health risks for both farmers and consumers. “From breeders to farmers and across the entire value chain, it opens the door to more stable production, reduced losses, and improved profitability under increasingly challenging growing conditions, while also reducing reliance on chemical inputs and offering potential health benefits for both farmers and consumers,” Eybshitz explained.

FAQ

Q: What is Tomato Yellow Leaf Curl Disease (TYLCD)?
A: TYLCD is a viral disease transmitted by whiteflies that can cause significant yield losses in tomato crops.

Q: What is marker-assisted selection?
A: Marker-assisted selection is a breeding technique that uses DNA markers to identify and track desirable traits in plants, speeding up the breeding process.

Q: How will farmers access these new tomato varieties?
A: Seed companies within the APSA-WorldVeg Vegetable Breeding Consortium will have access to the seeds and will be responsible for further development and distribution.

Did you know? Whiteflies can rapidly develop resistance to chemical pesticides, making integrated pest management strategies, like breeding for natural resistance, crucial for long-term control.

Pro Tip: Consider supporting seed companies that prioritize breeding for pest and disease resistance to promote more sustainable agricultural practices.

Want to learn more about sustainable agriculture and innovative breeding techniques? Explore our other articles on crop improvement and pest management. Share your thoughts in the comments below!