What is obturator in plant embryology?

In plant embryology, the obturator is a structure that aids in the development and dispersal of seeds. It is a tissue that forms at the base of the ovule and helps guide the pollen tube toward the egg cell during fertilization. After fertilization, the obturator often facilitates the movement of the developing embryo and may assist in seed dispersal by producing a mucilaginous substance that attracts animals or helps in the germination process. Its role can vary significantly among different plant species.