Fig. 3

Dormancy shoot bud (DSB) developmental phases in the first node. a–c Three typical developmental phases of DSB (arrow) at the early stage of primary stolon elongation. d–e DSB covered by a young trifoliolate leaf bract. f Closed bract with a DSB inside. g–j Scanning electron microscope (SEM) photomicrographs of DSB in (a–c) and (f). The scale bar is 10 μm in (a) and (g–h) 25 μm in B, 50 μm in (c), 100 μm in (d–e) 150 μm in F, and 20 μm in (i–j)