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Variability in Photosynthetic Rates and Accumulated Biomass Among Greenhouse-Grown Common Cocklebur (Xanthium strumarium) Accessions

Published online by Cambridge University Press:  20 January 2017

James J. Wassom ,
Andrew W. Knepp ,
Patrick J. Tranel  and
Loyd M. Wax
James J. Wassom
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Andrew W. Knepp
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Patrick J. Tranel*
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Loyd M. Wax
Affiliation:
USDA/ARS, Invasive Weed Management Research Unit, Urbana, IL 61801
*
Corresponding author's E-mail: tranel@uiuc.edu
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Abstract

Common cocklebur is an adaptable and competitive weed with variable morphology. To learn how the rate of net photosynthesis (Pn) by common cocklebur relates to traits that may influence competitiveness, we compared Pn, accumulation of biomass (shoot mass, root mass, and total plant mass), and total leaf area among six accessions of common cocklebur grown in a greenhouse. There were highly significant (P ≤ 0.01) differences among accessions for all measured traits. Correlations of each measure of biomass with total leaf area were positive and highly significant, but correlations of Pn with each biomass measure and with total leaf area were negative. The negative correlations were largely a result of relatively low biomass accumulation by the two accessions with the highest Pn. This contrasted with results from a previous experiment on field-grown common cocklebur plants, in which the correlation of Pn with shoot mass was positive (r = 0.64). Despite the negative Pn-to-biomass correlations in the greenhouse study, the rank among accessions for Pn in the greenhouse was nearly the same as with the field-grown plants (Spearman rank correlation r = 0.89). We conclude that the relative Pn rates among common cocklebur accessions grown in the greenhouse may be used to predict their relative Pn rates in the field, but relationships of Pn with biomass or leaf area observed in the greenhouse may not be a reliable indicator of relationships in the field.

Keywords

Common cocklebur, Xanthium strumarium L. #3 XANTHBiotypecompetitivenessleaf areaphotosynthesisstomatal densityCDT, Central Daylight TimePn, net photosynthetic ratePPFD, photosynthetic photon flux densityTOD, time of day
Type
Research
Information
Weed Technology , Volume 17 , Issue 1 , March 2003 , pp. 84 - 88
Copyright
Copyright © Weed Science Society of America 

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