Fig. 6.

Requirement of cytokinin for callus induction on wild-type leaf explants. Leaf sections of wild-type (SR1) plants were cultured for indicated days on media containing 2.0 μg/ml naphthaleneacetic acid (NAA) and 0.2 μg/ml kinetin, and then cultured on media containing 2.0 μg/ml NAA without kinetin until 28 days after the start of culture. (Bar, 1 cm.)