ISHS


Acta
Horticulturae
Home


Login
Logout
Status


Help

ISHS Home

ISHS Contact

Consultation
statistics
index


Search
 
ISHS Acta Horticulturae 515: XXV International Horticultural Congress, Part 5: Culture Techniques with Special Emphasis on Environmental Implications Chemical, Physical and Biological Means of Regulating Crop Growth in Ornamentals and Other Crops

EFFECT OF DAY AND NIGHT TEMPERATURE ALTERNATIONS ON MORPHOGENESIS IN DENDRANTHEMA GRANDIFLORUM (RAMAT.)

Author:   M. Nonaka
Keywords:   Chrysanthemum, temperature, DIF, internode, leaf growth, plant height
Abstract:
The difference (DIF) between day-temperature and night-temperature strongly influences plant morphogenesis such as internode length, flower stalk length, leaf area and plant height of Chrysanthemum (Dendranthema grandiflorum Ramt.). Positive DIF and temperature-rise treatment at the start of the day increased internode length and flower stalk length. Three days photoperiodic re-lighting treatment during short day-length treatment promoted flower stalk length. And upper leaf area. Consisting of a morning-drop and negative DIF, treatment at the start of short day-length treatment or at a visible bud stage reduced growth of flower stalk and upper leaf. Stem elongation rate (SER) was determined in light and in darkness under various temperature regimes. SER was strongly light dependent under alternation 14-hour days and 10-hour nights. Light-dark and dark-light transition had marked effects on SER. SER peaked immediately following the start of the night, and a minimum in SER occurred shortly after the start of the day, regardless positive or negative DIF.
  • Full Text (PDF format, 330453 bytes)
  • Citation
  • Translate

Download Adobe Acrobat Reader (free software to read PDF files)

515_18     515     515_20

URL www.actahort.org      Hosted by KU Leuven      © ISHS