Herbicide chlorsulfuron decreases assimilate transport out of treated leaves of field pennycress (Thlaspi arvense L.) seedlings

• Published in: Plant physiology (Bethesda) Vol. 93; no. 4; pp. 1441 - 1448
• Main Authors: Bestman, H.D. (The King's College, Edmonton, Alberta, Canada), Devine, M.D, Vanden Born, W.H
• Format: Journal Article
• Language: English
• Published: Rockville, MD American Society of Plant Physiologists 01.08.1990
• Subjects: Agronomy. Soil science and plant productions; Amino acids; Animal, plant and microbial ecology; Applied ecology; Biological and medical sciences; Branched chain amino acids; CRUCIFERAE; Ecotoxicology, biological effects of pollution; Effects of pollution and side effects of pesticides on plants and fungi; Exudation; FEUILLE; FOTOSINTESIS; Fundamental and applied biological sciences. Psychology; HERBICIDAS; HERBICIDE; Herbicides; HOJAS; Leaves; METABOLISME; METABOLISMO; Phloem; PHOTOSYNTHESE; Plants; PLANTULAS; PLANTULE; Radiocarbon; Seedlings; Sugars; TRANSLOCACION; TRANSLOCATION; TRANSPORT DES SUBSTANCES NUTRITIVES; TRANSPORTE DE NUTRIENTES; Translocation; Radiolabelling; Weed; Metabolite; Carbon dioxide; Pesticides; Plant leaf; Absorption; Cruciferae; Dicotyledones; Angiospermae; Triazine derivatives; Spermatophyta; Carbohydrate
• DOI: 10.1104/pp.93.4.1441
• ISSN: 0032-0889

Treatment of field pennycress (Thlaspi arvense L.) leaves with the herbicide chlorsulfuron resulted in a decrease in the export of assimilate. Twelve hours after a spot application of 1 microgram, assimiliate translocation was 70% of that in control leaves. In excised leaves treated with chlorsulfuron the total amounts of sugars and free amino acids were 150 and 170%, respectively, of the amounts in control leaves, 30 hours after herbicide treatment. The amount of sucrose was 247% of that in control leaves. The increase in the concentration of sucrose in the chlorsulfuron-treated leaves, combined with the absence of an effect of chlorsulfuron on carbon dioxide fixation, suggests that the decrease in assimilate transport is not due to an effect on the synthesis of assimilates, but rather to an effect on their movement out of the leaves. Supplying branched-chain amino acids to the field pennycress seedlings prior to the application of chlorsulfuron prevented the occurrence of the effects described