CSIRO Publishing blank image blank image blank image blank imageBooksblank image blank image blank image blank imageJournalsblank image blank image blank image blank imageAbout Usblank image blank image blank image blank imageShopping Cartblank image blank image blank image You are here: Journals > Functional Plant Biology   
Functional Plant Biology
Journal Banner
  Plant Function & Evolutionary Biology
blank image Search
blank image blank image
blank image
  Advanced Search

Journal Home
About the Journal
Editorial Structure
Online Early
Current Issue
Just Accepted
All Issues
Special Issues
Research Fronts
Evolutionary Reviews
Sample Issue
Call for Papers
For Authors
General Information
Submit Article
Author Instructions
Open Access
Awards and Prizes
For Referees
Referee Guidelines
Review an Article
Annual Referee Index
For Subscribers
Subscription Prices
Customer Service
Print Publication Dates

blue arrow e-Alerts
blank image
Subscribe to our Email Alert or RSS feeds for the latest journal papers.

red arrow Connect with us
blank image
facebook twitter LinkedIn

red arrow PrometheusWiki
blank image
Protocols in ecological and environmental plant physiology


Article << Previous     |     Next >>   Contents Vol 29(12)

Influence of rising atmospheric CO2 since 1900 on early growth and photosynthetic response of a noxious invasive weed, Canada thistle (Cirsium arvense)

Lewis H. Ziska

Functional Plant Biology 29(12) 1387 - 1392
Published: 19 December 2002


Using climate-controlled growth chambers, the growth, morphology and photosynthetic response of Canada thistle (Cirsium arvense L. Scop.), a recognized invasive weed, was determined at CO2 concentrations ([CO2]) of 285, 382 and 721 μmol mol–1 during the vegetative state. These concentrations correspond roughly to ambient [CO2] from 1900, 2001 and those projected for 2100, respectively. At the end of the vegetative stage, leaves grown at 721 μmol mol–1 still had significantly higher photosynthetic rates under the growth conditions, relative to the 285 or 382 μmol mol–1 CO2 treatment. Significant differences in leaf morphology, particularly the number and length of leaf spines, were also observed, with spine number and length increasing as a function of [CO2]. At the end of the vegetative stage, at 54 d after sowing (DAS), whole plant biomass had increased by 69% for the elevated (720 μmol mol–1) CO2 treatment relative to current ambient CO2. However, biomass had increased by 126% for current ambient (380 μmol mol–1) relative to the concentration that existed in 1900 (285 μmol mol–1). Data from this study indicate that rising [CO2] may have already had a substantial influence on the vegetative development of Canada thistle, by significantly stimulating growth and photosynthesis, as well as altering leaf defenses to potential herbivory. Overall, these changes could have important implications for growth and control of this noxious weed as atmospheric CO2 continues to increase.

Keywords: carbon dioxide, climate change, growth, morphology, photosynthesis.

Full text doi:10.1071/FP02052

© CSIRO 2002

blank image
Subscriber Login

PDF (273 KB) $25
 Export Citation
Legal & Privacy | Contact Us | Help


© CSIRO 1996-2015