Document Detail

Elevated carbon dioxide increases nectar production in Epilobium angustifolium L.
MedLine Citation:
PMID:  16086093     Owner:  NLM     Status:  MEDLINE    
Effects of elevated CO2 and nutrient availability on nectar production and onset of flowering in five different seed families (genotypes) of Epilobium angustifolium were investigated in a greenhouse experiment. Elevated CO2 significantly increased nectar production per day (+51%, p < 0.01), total sugar per flower (+41%, p < 0.05), amino acid concentration (+65%, p < 0.05) and total amino acids per flower (+192%, p < 0.001). All other parameters tested, i.e., nectar sugar concentration, proportion of glucose/fructose and proportion of sucrose/(glucose + fructose), were not significantly affected by elevated CO2 and/or fertilization. However, elevated CO2 caused a marginally significant trend for earlier flowering in highly fertilized plants. No significant family x CO2 interaction was found in any of the tested parameters, but the response in nectar production varied considerably among seed families (+10 to +104%) and was significantly positive in two of the five seed families investigated. Our results are not consistent with earlier studies on effects of elevated CO2 on nectar production and flowering phenology in other plant species. It seems, on the other hand, that CO2 effects on nectar production are specific to species and genotype. Hence, no general conclusions about effects of elevated CO2 on these floral traits can be drawn at present, but it must be cautioned that elevated CO2 might not only increase floral rewards as in E. angustifolium, but might also lead to shifts or even disruptions in fine-tuned plant-pollinator interactions.
Andreas Erhardt; Hans-Peter Rusterholz; Jürg Stöcklin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-10-28
Journal Detail:
Title:  Oecologia     Volume:  146     ISSN:  0029-8549     ISO Abbreviation:  Oecologia     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2005-11-02     Completed Date:  2006-01-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0150372     Medline TA:  Oecologia     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  311-7     Citation Subset:  IM    
Department of Integrative Biology, Section of Conservation Biology, University of Basel, St Johanns-Vorstadt 10, CH 4056, Basel, Switzerland.
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MeSH Terms
Carbon Dioxide / pharmacology*
Environment, Controlled
Epilobium / drug effects,  metabolism*
Flowers / drug effects*,  metabolism*
Reg. No./Substance:
124-38-9/Carbon Dioxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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