Abstract
Dormancy development in four Lilium genotypes,L. speciosum, Star Gazer, C. King and Snow Queenregenerated in vitro was compared. Major factorsinfluencing dormancy development were the same for different genotypes andespecially L. speciosum and Star Gazer, that are closelyrelated, reacted similarly. Temperature was the main factor in dormancyinduction and breaking. The range of temperatures that induced dormancy and thelevel of dormancy that developed differed per genotype. In Star Gazer, dormancydeveloped gradually but in Snow Queen, dormancy developed very fast. Thereactions to temperature, reflected the climate in the area of origin. Abscisicacid deepened the level of dormancy induced by temperature but had no effectunder non-inductive temperature conditions. When abscisic acid synthesis wasblocked, no dormancy developed. Dormancy in all genotypes was broken by coldincubation for severalweeks. The cold requirement of the genotypes differed in line with the naturalwinter conditions in their habitat. The effect of hormones on dormancy breakingwas also investigated. A gibberellin treatment of 24 h brokedormancy in L. speciosum, Star Gazer and Snow Queen.
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