图4. 芳香堆心菊下胚轴愈伤组织诱导的阶段(C4) (A) 下胚轴外植体; (B) 愈伤组织(20天)。Bars=1 cm。C4同表1。
Figure 4. Several stages of callus induction of Helenium aromaticum hypocotyls (C4) (A) Hypocotyl explants; (B) Calli (20 d). Bars=1 cm. C4 is the same as Table 1.