The optimal temperature range for germination of achenes of the De Caen type of cultivated A. coronaria L. was 10-20°C. Continuous irradiation with white light retarded germination, particularly at supraoptimal temperature. The retardation was caused by the far-red component of the light. Blue light was inactive by itself but synergized with far-red. Gibberellic acid (GA,) promoted gerrnination only at supraoptimal temperature (2S°C). Abscisic acid (ABA) inhibited germination more at 20 than at 15°C. Rinsing the achenes with water completely removed the inhibition caused by 40 p.p.m. ABA. GA3 at a concentration of 100 p.p.m. partly overcame the inhibition caused by ABA.The growth retardants (2-chloroethyl)trimethylammonium chloride and Amo-1618 12'-isopropyl-4'-(trimethylammonium chloride)-5'-methylphenyl piperidine-1-carboxylate] inhibited germination more at
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