Journal of the Japanese Society for Horticultural Science
Online ISSN : 1880-358X
Print ISSN : 0013-7626
ISSN-L : 0013-7626
Changes in the Depth of Dormancy in Freesia Corms during Growth and Storage
Eiichi KANEKOHideo IMANISHI
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1985 Volume 54 Issue 3 Pages 388-392

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Abstract

Freesia corms freshly harvested late in spring are known to be in a state of deep dormancy and can be released from dormancy after exposure to high summer temperatures. This study was carried out to determine when dormancy starts duringthe growth period and when it ends during storage.
New corms gradually entered dormancy as they increased in size. They reached a state of true dormancy at flowering time of the mother plants in mid-April. At this stage, differentiation of leaves on the uppermost axillary buds stopped and sprouting percentage of these excised buds cultured in vitro was very low. Similarly, intact corms cultured in vitro also sprouted poorly. The state of true dormancy continued till harvest time at the end of May.
The dormancy disappeared at the end of August, when corms showed a high rate of sprouting and resumption of leaf differentiation on their uppermost buds. At the same time, the total sugar content of the corms increased greatly.

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