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Pak-choi(Brassica campestris ssp.chinensis Makino L.)originated from China,and is one of the most important vegetable crops in China and worldwide that has the largest planting area and total yield.In Pak-choi production,premature bolting occurred from time to time is the important issues that need to be addressed in the spring vegetable production.The most cost effective solution to solve this problem is to develop boltingresistant varieties and germplasms.