International Sugar Journal

Detection, breeding and selection of durable resistance to brown rust in sugarcane* [Full subscriber]

Abstract Brown rust, caused by Puccinia melanocephala, is an important disease of sugarcane in Louisiana. The adaptability of the pathogen has repeatedly resulted in resistant cultivars becoming susceptible once they are widely grown. The frequency of the brown rust resistance gene Bru1 was low in the breeding and selection populations in Louisiana. Through markers-assisted screening and selection, the frequency of Bru1 is increasing in the breeding populations being developed for gene introgression. Bru1 has provided resistance in diverse germplasm across widespread regions. However, over reliance on one resistance source is inadvisable. Development of a controlled conditions inoculation method allowed evaluation…

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