Germination frequencies of A. crenata seeds with seed coat and some or all of the endosperm removed (see Figure 1). Seeds were cultured on MS medium supplemented with sucrose (a) or without sucrose (b). Open circle: intact seeds with seed coat; filled circle: seeds without seed coat; triangles: seeds without seed coat and micropylar endosperm; squares: seeds without seed coat and half of the endosperm; diamonds: seeds without seed coat and endosperm (isolated embryos). Note that open circles and triangles, and squares and diamonds overlapped in (b).
