ANATOMY OF THE ROOT TUBER FORMATION OF SWEET POTATO VARIETIES——Ⅰ.COMPARATIVE STUDIES ON THE PRIMARY STRUCTURE OF THE ROOT OF DIFFERENT CULTIVARS IN IPOMOEA BATATAS LAM
ANATOMY OF THE ROOT TUBER FORMATION OF SWEET POTATO VARIETIES——Ⅰ.COMPARATIVE STUDIES ON THE PRIMARY STRUCTURE OF THE ROOT OF DIFFERENT CULTIVARS IN IPOMOEA BATATAS LAM