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Researchers Identify Genes Making Strawberries Resistant to Fusarium Wilt

Resistant Varieties to Be Released Later This Year to Growers

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Rows of strawberries, some disease-free, some dead.
Resistant variety strawberries planted amid cultivars susceptible to Fusarium wilt. (Glenn Cole/嘿嘿视频)

Strawberry losses from Fusarium wilt could become less of a threat after researchers at the University of California, Davis, discovered genes that are resistant to the deadly soil-borne disease.

The findings, published in the journal , are the culmination of several years鈥 work, and the discovery will help protect against disease losses, said Steve Knapp, director of the at 嘿嘿视频.

鈥淲hat we鈥檝e accomplished here is important and it鈥檚 valuable for the industry and it鈥檚 going to protect growers,鈥 Knapp said.

Strawberries are a key crop in California, where about 1.8 billion pounds of the nutritious fruit are grown each year, making up roughly 88% of what is harvested in the United States.

Finding the genes could prevent a Fusarium wilt pandemic.

鈥淭he disease has started to appear more often up and down the state,鈥 said Glenn Cole, a breeder and field manager with the Strawberry Breeding Program. 鈥淥nce the wilt gets in, the plant just crashes. You have total die out.鈥

Searching for resistance

嘿嘿视频 scientists screened thousands of strawberry plants in the College of Agricultural and Environmental Sciences鈥 nursery and took DNA samples. They then used genetic screening and developed DNA diagnostics to identify genes that are resistant to the primary race of Fusarium wilt.

鈥淭he genes have been floating around in the strawberry germplasm for thousands of years,鈥 Cole said, but no one worked to identify them.  

Strawberry plant affected by Fusarium wilt
Strawberry plants affected by Fusarium wilt. (Fred Greaves/嘿嘿视频)

 

This latest development brings 鈥渟trawberry into the 21st century in terms of solving this problem,鈥 Knapp said.

Protecting future crops

This work means breeders can introduce the resistant gene into future strawberry varieties. This fall the program will release new cultivars that have the Fusarium wilt resistance gene. And the DNA diagnostic tools will help breeders respond to new Fusarium wilt variants that develop.

鈥淭here will be new threats and we want to be prepared for them,鈥 Knapp said. 鈥淲e want to understand how this works in strawberries so that as new threats emerge, we can address them as rapidly as possible.鈥

鈥淚f you don鈥檛 have Fusarium resistance, you鈥檙e done,鈥 Cole said. 鈥淭he disease could be around more than you think.鈥

Fusarium wilt hasn鈥檛 traditionally been an issue, but when the fumigant methyl bromide was phased out in 2005, things changed. The disease was in the soil, and without the fumigant, instances of wilt increased, especially in areas where crops weren鈥檛 rotated.

Breeding new varieties

Knapp and Cole have informed the industry about current strawberry varieties that have the resistance so they can select plants with that added protection. The new resistant varieties coming out later this year will be suitable for several growing seasons. 

鈥淚t鈥檚 a big deal,鈥 Cole said. 鈥淓verything is incremental in plant breeding, but it鈥檚 a big deal.鈥

Plant scientists have been breeding strawberries at 嘿嘿视频 since the 1930s, and they have released more than 60 patented varieties through the public breeding program.

All of the work happened at 嘿嘿视频. Dominique Pincot, Mitchell Feldmann, Mishi Vachev, Marta Bjornson, Alan Rodriguez, Randi Famula and Gitta Coaker from the Department of Plant Sciences, and Thomas Gordon from the Department of Plant Pathology contributed to the research, as did Michael Hardigan and Peter Henry, who are now at the U.S. Department of Agriculture Agricultural Research Service, and Nicholas Cobo, who is at University of La Frontera in Chile.

The research was funded by 嘿嘿视频 and grants from the USDA National Institute of Food and Agriculture Specialty Crop Research Initiative.

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