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Diurnal Fluctuations in Ethylene Formation in Chenopodium rubrum.
MedLine Citation:
PMID:  12223658     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Ethylene formation was studied in 5- to 6-d-old Chenopodium rubrum seedlings under the following light regimes: continuous light (CL), continuous darkness (CD), and alternating light/darkness (12 h of each). No significant regular oscillations in ethylene formation were found in either the CL or CD groups. In the light/dark regime, pronounced diurnal fluctuations in ethylene formation were observed. Activity of 1-aminocyclopropane-1-carboxylic acid (ACC) oxidase was transiently increased on transfer from light to dark and vice versa. In CL, ACC oxidase activity did not change significantly, whereas in CD, it decreased continuously after the initial increase. The in vivo levels of ACC and N-malonyl-ACC (MACC) were constant for the first few hours of darkness, then decreased dramatically, but increased again in the light. In constant darkness, the level of ACC displayed endogenous rhythm, with minimum values at h 12 and 44, and a maximum value at h 32 to 36. The level of MACC in both shoots and roots decreased in the CD group until h 12, and then remained constant until h 30 before decreasing continuously. We conclude that the photoperiodic regime affects both ACC and MACC levels, as well as the conversion of ACC to ethylene. Correlation of the described changes in ethylene formation to photoperiodic flower induction is discussed.
Authors:
I. Machackova; N. Chauvaux; W. Dewitte; H. Van Onckelen
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Plant physiology     Volume:  113     ISSN:  1532-2548     ISO Abbreviation:  Plant Physiol.     Publication Date:  1997 Mar 
Date Detail:
Created Date:  2002-Sep-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  981-985     Citation Subset:  -    
Affiliation:
De Montfort University, Norman Borlaug Centre for Plant Science, Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Ke dvoru 15, 166 00 Praha 6, Czech Republic (I.M.).
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