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Photosynthesis and Growth Responses to Irradiance in Soybean (Glycine max) and Three Broadleaf Weeds

Published online by Cambridge University Press:  12 June 2017

Emilie E. Regnier
Affiliation:
Dep. Agron., Univ. Illinois, Plant Physiol., U.S. Dep. Agric., Agric. Res. Serv., Univ. Kentucky, N-222, AXC-N, Lexington, KY 40546
Michael E. Salvucci
Affiliation:
Dep. Agron., Univ. Illinois, Plant Physiol., U.S. Dep. Agric., Agric. Res. Serv., Univ. Kentucky, N-222, AXC-N, Lexington, KY 40546
Edward W. Stoller
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., 1102 S. Goodwin Ave., Urbana, IL 61801

Abstract

Photosynthesis and growth responses to irradiance level during growth were compared in soybean (Glycine max L. Merr. ‘Century’) and three broadleaf weeds to determine if these responses were associated with differences in shade tolerance among species. In response to reduced irradiance during growth, leaf thickness of all species decreased, while chlorophyll content per unit leaf volume and photosynthetic rate per unit leaf volume, measured at low irradiance, increased. Soybean and common cocklebur (Xanthium strumarium L. #3 XANST) also exhibited a decrease in soluble proteins on a leaf volume basis under reduced irradiance, and common cocklebur further exhibited a decrease in ribulose-1,5-bisphosphate carboxylase (RuBPcase) protein per unit leaf volume. Decreased irradiance during growth did not alter the content of RuBPcase or other soluble proteins per unit leaf volume in jimsonweed (Datura stramonium L. # DATST) or velvetleaf (Abutilon theophrasti Medic. # ABUTH). The superior shade tolerance of common cocklebur compared to the other species was attributed in part to the levels of RuBPcase and other photosynthetic proteins in leaves developed at low irradiance.

Type
Weed Biology and Ecology
Copyright
Copyright © 1988 by the Weed Science Society of America 

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