Abstract
Leaf blades of Crepis capillaris were cultured for one month in the dark on Linsmaier and Skoog's basic agar medium containing indoleacetic acid (IAA) and kinetin, singly or in combination, to examine a relation of plant hormones to organ differentiation. On a basal medium, leaf blades showed no morphological changes. IAA (0.1-10ppm) stimulated stronger rooting with an increase of concentration. Single addition of kinetin initiated adventitious bud on leaf blades isolated from the seedlings grown on basal medium. However, coexistence of IAA and kinetin was required for bud initiation on the leaf blades severed from leaves developing on kinetin medium. The optimum concentration of kinetin was 0.5ppm. Kinetin suppressed the rooting at a higher concentration.
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