雌蕊受精后,由子房壁的组织分化、发育而成的多层不同的组织。成熟的果皮一般可分为外果皮、中果皮和内果皮三层。
After the pistil is fertilized, it differentiates and develops into multiple different layers of tissue from the ovary wall. The mature fruit peel can generally be divided into three layers: the outer peel, the middle peel, and the inner peel.