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Carbon allocation and translocation in chlorsulfuron-treated canola (Brassica napus)

Published online by Cambridge University Press:  12 June 2017

Songmun Kim  and
William H. Vanden Born
Songmun Kim
Affiliation:
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5
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Abstract

Our objective was to determine if the chlorsulfuron-induced reduction in assimilate export from leaves can be attributed to a shortage of carbohydrates. Treated canola leaves showed no reduction in carbon fixation or carbohydrate production during the first 24 h, but they exuded only 17 to 27% of the amount of sucrose exuded by corresponding control leaves. Exposure of the leaves to higher concentrations of CO2 (500 vs. 350 μl L−1) resulted in greater net carbon exchange and higher starch content, but failed to overcome the reduction in sucrose export, presumably because of increased carbon allocation to starch.

Keywords

Chlorsulfuron, 2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamidecanola, Brassica napus L.Sucrose translocationcarbon dioxidenet carbon exchange rate

Information

Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 45 , Issue 4 , August 1997 , pp. 466 - 469
Copyright
Copyright © 1997 by the Weed Science Society of America 

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