design: Genomic DNA was extracted using a Bacterial DNA Kit according to the manufacturer protocol. DNA concentration and purity were determined via Qubit fluorometer and Nanodrop 2000 spectrophotometer. DNA integrity was assessed by 0.5% agarose gel electrophoresis. Library construction and sequencing with BGISEQ500 Whole genome sequencing was performed on the BGISEQ-500 platform at BGI.