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Two Resistant Lines against Maize Head Smut utilizing RsrR gene Developed in China

Two Resistant Lines against Maize Head Smut utilizing RsrR gene Developed in China

In the 6th July online publication of Euphytica, WH Li and nine other authors published a review paper entitled, “Characterization and molecular mapping of RsrR, a resistant gene to maize head smut (MHS).” In recent years MHS caused by Sporisorium reilianum (Kühn) Landon and Fullerton has turned out to be one of most devastating diseases of maize in China. In other parts of the globe, this devastating disease was reported from time to time. In this paper the above authors report of a resistant gene RsrRagainst the pathogen Shenyang-1 of S. reilianum. They discovered the resistant gene in the resistant inbred line ‘R24’ and mapped it in the long arm of maize chromosome 1. The technique they used for this purpose was simple sequence repeat-bulked segregant analysis (SSR-BSA) and sequence related amplified polymorphism (SRAP)-BSA analysis. They observed
the nearest linkage marker is 2.5 cM apart from the RsrR gene. The maize breeders in China have successfully transferred the resistant gene RsrR into two elite maize inbred lines, ‘Huangzao4’ and ‘Qi319’, through conventional hybridization and marker assisted selection.

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