Japan International Research Center for Agricultural Sciences | JIRCAS

Seasonal Variability in Dormancy and Flowering Competence in Chrysanthemum: Chilling impacts on shoot extension growth and flowering capacity

Japan Agricultural Research Quarterly
ISSN
00213551
NII recode ID (NCID)
AA0068709X
Full text

Chrysanthemum (Chrysanthemum morifolium Ramat.), an herbaceous perennial short-day plant, shows seasonality in its regulation of shoot extension growth and flowering capacity. To enhance our understanding of the physiological mechanisms of the seasonality in chrysanthemum, we investigated the changes in growth and flowering capacity, and the variation among cultivars. We also evaluated seasonal changes and the response to chilling in shoot extension and flowering capacity in chrysanthemum under controlled environmental conditions (20°C/15°C (light/dark) with a 12-h light period). Both shoot extension and flowering capacity under the subsequent growing conditions were regulated by the temperature of prior growing conditions. After the temperature increased over the summer, chrysanthemums showed a reduced ability for extension growth, and became more difficult to induce flowering. Chilling stimulated the extension growth of shoots when the meristems were entering a dormant state. Chilling had the opposite effect on two regulatory pathways involved in flowering capacity. A pathway related to the meristem dormant state was suppressed by exposure to chilling and induced flowering, and chilling activated an inhibitory regulator in parallel.

Date of issued2017-10-02
CreatorTamotsu HISAMATSUKatsuhiko SUMITOMOMichio SHIBATAMasaji KOSHIOKA
Subject

Chrysanthemum morifolium

chilling

flowering

PublisherJapan International Research Center for Agricultural Sciences
Dates2017-10-02
NII resource type vocabularyJournal Article
Volume51
Issue4
spage343
epage350
DOI10.6090/jarq.51.343
RightsJapan International Research Center for Agricultural Sciences
URLJ-STAGE
Languageeng