Document Detail

Acute drought stress and plant age effects on alkamide and phenolic acid content in purple coneflower roots.
MedLine Citation:
PMID:  12567279     Owner:  NLM     Status:  MEDLINE    
The effects of acute periods of drought stress on dry weight, and alkamide and phenolic acid content in purple coneflower [Echinacea purpurea (L.) Moench, Asteraceae] roots are described. Plants subjected to brief drought stress periods for two seasons during the initial flowering stage (D-F2) produced fall-harvested roots with significantly greater cichoric acid concentration (mg/g) than corresponding well-watered controls of the same age (C-2). Total alkamide, including the tetraenoic acid isomers, and chlorogenic acid concentrations from fall-harvested roots were largely unaffected by drought stress, regardless of when the stress occurred developmentally. The alkamide concentration in three-year roots was significantly less than that in two-year roots, with an average decrease of 50.5 %. Conversely, total phenolic acids increased an average of 67.1 % for all treatments from two to three years of age. Root dry weight increased significantly by an average of 70.0 % for all drought-stressed plants from two to three years of age, compared to an increase of 35.2 % for well-watered controls. The results suggest that controlled drought stress can stimulate increased root dry weight and root cichoric acid content, and that root age is the predominant factor determining overall phytochemical content variation.
Dean E Gray; Stephen G Pallardy; H E Garrett; George E Rottinghaus
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Planta medica     Volume:  69     ISSN:  0032-0943     ISO Abbreviation:  Planta Med.     Publication Date:  2003 Jan 
Date Detail:
Created Date:  2003-02-04     Completed Date:  2003-04-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0066751     Medline TA:  Planta Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  50-5     Citation Subset:  IM    
Life Sciences Division, Agricultural Sciences, Midwest Research Institute, Kansas City, Missouri 64110, USA.
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MeSH Terms
Alkynes / metabolism*
Amides / metabolism*
Echinacea / chemistry,  metabolism*,  physiology
Hydroxybenzoic Acids / metabolism*
Plant Roots / chemistry,  metabolism*,  physiology
Time Factors
Reg. No./Substance:
0/Alkynes; 0/Amides; 0/Hydroxybenzoic Acids; 29656-58-4/phenolic acid; 7732-18-5/Water

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