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Dual virus-resistant cassava developed

Researchers from the Swiss Federal Institute of Technology (ETH _ Zurich) have developed genetically modified cassava varieties resistant to two major cassava viral diseases. The plants are resistant to cassava brown streak disease (CBSD) which is caused by cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus (UCBSV), and cassava mosaic disease (CMD). Natural resistance has so far only been reported for CMD, which, in Africa, is caused by at least seven cassava mosaic geminivirus species. CMD-resistant cassava varieties are also commonly susceptible to CBSD.



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