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Melon production in China is threatened by cucurbit powdery mildew incited by  Podosphaera xanthii , which can cause severe yield losses. Disease reactions of 10 melon  P. xanthii  race differentials indicated the presence of a unique race of  P. xanthii , denoted pxCh1, in the Shanghai area. Resistance to  P. xanthii  race pxCh1 in melon PI 134198, which originated from India, was controlled by a single, dominant gene, designated  Pm -8, in a cross with susceptible melon inbred S717. A search for a molecular marker linked to  Pm -8 was initiated using the same cross. Bulk segregant analysis of their F 2  progeny revealed one sequence-related amplified polymorphism (SRAP) marker of 148 bp linked to  Pm -8, at 3.9 cM. The SRAP segment was recovered, cloned, and sequenced and converted into a sequence-amplified characterized region marker for marker-assisted selection of  Pm -8 in breeding programs to develop melon cultivars resistant to  P. xanthii  race pxCh1.

hortscience

A Sequence-amplified Characterized Region Marker for a Single, Dominant Gene in Melon PI 134198 that Confers Resistance to a Unique Race of Podosphaera xanthii in China