Temperature affects leaf unfolding rate and flowering of cyclamen

Citation
M. Karlsson et J. Werner, Temperature affects leaf unfolding rate and flowering of cyclamen, HORTSCIENCE, 36(2), 2001, pp. 292-294
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
HORTSCIENCE
ISSN journal
0018-5345 → ACNP
Volume
36
Issue
2
Year of publication
2001
Pages
292 - 294
Database
ISI
SICI code
0018-5345(200104)36:2<292:TALURA>2.0.ZU;2-9
Abstract
The rate of leaf unfolding for Cyclamen persicum Mill. was determined at 8 to 24 degreesC. Temperature treatments started 9 weeks from seeding and aft er 8 weeks all plants were moved to 16 degreesC. The cultivars Miracle Salm on, Miracle Scarlet, and Miracle White produced leaves at a similar rate. T he relationship of (leaves/d) = - 0.01727 - 0.02284 * degreesC + 0.005238 * (degreesC)(2)- 0.000162 * (degreesC)(3) (R-2 = 0.99) best described the le af unfolding rate in response to temperature. The maximum leaf unfolding ra te was estimated to 0.329 leaves/day at 19.1 degreesC. Flower buds (2 mm di ameter) developed within 60 days from the start of temperature treatments e xcept at 8 degreesC. Thirty-five additional days at 16 degreesC were requir ed for cyclamen initially grown at 8 degreesC for 8 weeks to produce flower buds. Despite similar conditions during bud development, flowering was del ayed 14 to 18 days for plants initially grown at 24 degreesC compared to th ose grown at 12 to 20 degreesC. Plants initially at 8 degreesC did not flow er within 70 days at 16 degreesC. Leaf and flower numbers at first open flo wer increased as initial temperature increased from 12 to 24 degreesC while dry weight and height only increased to 20 degreesC. No correlation betwee n Leaf unfolding and rate of flowering or flower number was detected. Recom mendations for 20 degreesC during early cyclamen growth can be expected to support rapid rates of leaf unfolding and development, and large flower num bers.