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Physiological characteristics of linuron-resistant Portulaca oleracea

Published online by Cambridge University Press:  20 January 2017

Joseph G. Masabni  and
Bernard H. Zandstra
Joseph G. Masabni
Affiliation:
Department of Horticulture, Michigan State University, East Lansing, MI 48824-1325
Corresponding
E-mail address:
zandstra@msu.edu
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Abstract

Studies were conducted to compare physiological characteristics of linuron-susceptible and -resistant Portulaca oleracea. The susceptible biotype had heavier seed and germinated more rapidly than the resistant biotype. Eight weeks after seeding, fresh and dry weights of susceptible P. oleracea plants were significantly greater than those of resistant plants. Susceptible P. oleracea had a significantly higher CO2 assimilation rate at 30 C, but was similar to that of resistant P. oleracea at 40 C. The susceptible biotype had a significantly higher CO2 assimilation rate at CO2 concentrations ≥ 600 ppm and at incident light levels ≥ 900 µmol m−2 s−1. The susceptible biotype had higher carboxylation and photochemical efficiencies.

Keywords

Atrazine cyanazine diuron linuron prometryn simazine Portulaca oleracea L. POROL, common purslane Carboxylation efficiency CO2 compensation point total dark respiration growth rate herbicide resistance internal CO2 concentration light compensation point photochemical efficiency stomatal conductance stomatal limitation
Type
Research Article
Information
Weed Science , Volume 48 , Issue 4 , August 2000 , pp. 420 - 425
Copyright
Copyright © Weed Science Society of America 

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