[Effect of 2-chloro-9-fluorenolo-9-carbonic acid on stem elongation of peas in light and darkness].

Fluorenole in small amounts promotes, in high concentrations inhibits growth of normal peas. With given amounts of fluorenole the relative inhibition of growth is constant for all gibberellin-concentrations. A competitive effect of fluorenole against gibberellin is therefore excluded.Growth of peas in light is inhibited less by fluorenole than in darkness. On the other hand cycocel inhibits growth of peas in light much more than in darkness. Growth seems to depend in darkness and light on two differently effective and independent processes, one of which is cycocel-sensitive, i.e. gibberellin-dependent, and the other fluorenole- and light-sensitive.