Developmental Stage and Temperature Influence Elongation Response of Petiole to Low Irradiance in Cyclamen persicum

Title
Developmental Stage and Temperature Influence Elongation Response of Petiole to Low Irradiance in Cyclamen persicum
Author(s)
오욱김기선[김기선]
Keywords
F1 ROSEMUNDE PRIMULACEAE; GIBBERELLIN CONTENT; LIGHT-INTENSITY; DWARF WHEAT; GROWTH; LEAF; SHADE; LEAVES; TALL; RESPONSIVENESS
Issue Date
201010
Publisher
KOREAN SOC HORTICULTURAL SCIENCE
Citation
KOREAN JOURNAL OF HORTICULTURAL SCIENCE & TECHNOLOGY, v.28, no.5, pp.719 - 727
Abstract
Reduced irradiance promotes shoot elongation depending on developmental stage and environmental factors and decreases plant quality in Cyclamen persicum Mill. To determine the petiole elongation responses to low irradiance, 'Metis Scarlet Red' cyclamen at different developmental stages [juvenile (5-6 unfolded leaves), transitional (1-3 visible flower buds), or mature (1-3 elongating peduncles)] was grown in growth modules at 60 (low light, LL) or 240 (high light, HL) mu mol.m(-2).s(-1) PPFD within the growth chambers at different temperatures [16/12 (low temperature, LT), 22/18 (medium temperature, MT), or 28/24 degrees C (high temperature, HT) (day/night)]. In Experiment 1, juvenile plants were either kept in an LL or HL module during, the entire treatment of 4 weeks or were transferred to the other module at 1, 2, or 3 weeks after treatment in an MT chamber. In Experiment 11, juvenile, transitional, or mature plants were moved to the HL module at 0, 3, 6, 9, or 12 days after being placed in the LL module at the MT chamber and grown for 21 days. In Experiment III, transitional plants were moved to the HL module at 0, 3, 6, 9, or 12 days after being placed in the LL module at the LT, MT, or HT chambers. As the exposure duration to LL increased from 0 to 4 weeks or from 0 to 12 days, petiole length and plant height increased at all temperatures and developmental stages. In Experiment I, the exposure to LL during the latter period, rather than the early period, increased elongation rate. In Experiment II, petiole elongation in transitional plants was more sensitive to LL than juvenile or mature plants during the early period of the treatment for 12 days. In Experiment III, petiole length increased with increasing temperature and exposure duration to LL. Petiole elongation rate at HT increased rapidly from the beginning of LL exposure as compared to LT. Increase of 6 degrees C in temperature had the similar effect to LL exposure for 3 days in petiole elongation. To conclude, transitional cyclamen under higher temperatures responds more immediately to low irradiance and elongates its petioles.
URI
http://hdl.handle.net/YU.REPOSITORY/23485
ISSN
1226-8763
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자연자원대학 > 원예생명과학과 > Articles
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