Copper regulated the expressions of MdLAC7 and MdCCR1 to promote the biosynthesis of lignin in apple peel

Soil pollution caused by copper (Cu) is a serious environmental pollution problem, which seriously affects the normal growth and development of plants. The excessive accumulation of copper Cu2+ in apple peel seriously affects the appearance quality and commerciality of fruits, but research on the relationship between copper Cu2+ and lignin biosynthesis in apple peel are rare.