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Changes in phytohormone are one of the adaptive strategies to confront adversity in plants.Boron(B)deficiency is a worldwide problem,and Brassica napus is one of the most hypersensitive crops to B deficiency.In this study,the different phytohormone responses to boron deficiency between Brassica napus B-efficient cultivar QY10 and B-inefficient cultivar W10 were investigated.