Thermoperiodic control of stem elongation and endogenous gibberellins in Campanula isophylla |
| |
Authors: | E Jensen S Eilertsen A Ernsten O Juntilla R Moe |
| |
Institution: | (1) Department of Pharmacy, University of Tromsø, N-9037 Tromsø;(2) Department of Plant Physiology and Microbiology, University of Tromsø, N-9037 Tromsø;(3) Department of Horticulture, Agricultural University of Norway, P.O. Box 502, N-1432 As, Norway |
| |
Abstract: | The effect of day/night temperature regimes on stem elongation and on the content of endogenous gibberellins (GAs) in vegetatively propagated plants of Campanula isophylla cv. Hvit have been studied. Compared with a constant temperature regime at 18°C (18/18°C), stem and internode elongation was enhanced significantly by a combination of high day/low night temperature (21/15°C) and inhibited by an opposite regime (15/21°C). Gibberellins A1, A19, A44, A53, and A97 were identified as endogenous components in Campanula. (GA97 was earlier referred to as 2 -OH-GA53.) Quantitative analysis of the endogenous GAs indicates that temperature regimes that stimulate elongation growth are accompanied by an increase in the level of GA1, GA19, and GA44. On the other hand, in plants grown under conditions that reduced stem elongation growth, there was an increased level of GA97.Abbreviations DIF
difference between day temperature and night temperature
- GA
gibberellin
- HPLC
high performance liquid chromatography
- GC-MS
gas chromatography-mass chromatography
- SPE
solid phase extraction
- TMS
trimethylsilyl
- MSTFA
N-methyl-N-TMS-trifluoroacetamide
- KRI
Kovats retention index
- SIM
selected ion monitoring
- D2
deuterated |
| |
Keywords: | Campanula Stem elongation Endogenous GAs GA application Internode elongation Thermoperiodicity |
本文献已被 SpringerLink 等数据库收录! |
|