caa a22 4500 477111475 CHVBK 20180405111610.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00015407 doi (NATIONALLICENCE)springer-10.1007/BF00015407 The influence of chlorsulfuron and metsulfuron methyl on root growth and on the ultrastructure of root tips of germinating maize seeds [Elektronische Daten] [A. Flaburiari, U. Kristen] Seeds of Zea mays L., germinating in soil, were exposed to very low doses of the sulfonylurea herbicides chlorsulfuron and metsulfuron methyl. At a concentration of 0.012 mg L−1, chlorsulfuron caused 72% and metsulfuron methyl 55% growth reduction of the young primary roots. Both herbicides also caused obvious injuries to the root tips. Scanning electron microscopic observations of the root tip surfaces indicated an inhibition of slime secretion at a herbicide concentration of 1.5 mg L−1. Transmission electron microscopy revealed obvious changes to the nuclei and deformation of radial cell walls in the primary root cortex at 0.012 and 1.5 mg L−1 for both herbicides. Moreover, the secretory cells of the root cap periphery showed partially irregular deposition of premature cell wall or slime material at a concentration of 0.012 mg L−1 of both herbicides. From the results of our electron microscopic observations we conclude that the primary roots of maize seedlings are seriously affected by extremely low concentrations of even those herbicides which (as chlorsulfuron and metsulfuron methyl) have been developed to inhibit the growth of dicotyledonous weeds. Moreover, we suggest that the frequently observed growth retardation of crop seedlings is a consequence of early root tip injuries caused by herbicide residues in the soil. ei]H Lambers Kluwer Academic Publishers, 1996 herbicides nationallicence chlorsulfuron nationallicence metsulfuron methyl nationallicence root tip ultrastructure nationallicence root growth nationallicence Zea mays nationallicence Flaburiari A. Institut für Allgemeine Botanik, Universität Hamburg, Ohnhorststrasse 18, D-22609, Hamburg, Germany aut Kristen U. Institut für Allgemeine Botanik, Universität Hamburg, Ohnhorststrasse 18, D-22609, Hamburg, Germany aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 180/1(1996-03-01), 19-28 0032-079X 180:1<19 1996 180 11104 https://doi.org/10.1007/BF00015407 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00015407 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Flaburiari A. Institut für Allgemeine Botanik, Universität Hamburg, Ohnhorststrasse 18, D-22609, Hamburg, Germany aut NATIONALLICENCE 700 1- Kristen U. Institut für Allgemeine Botanik, Universität Hamburg, Ohnhorststrasse 18, D-22609, Hamburg, Germany aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 180/1(1996-03-01), 19-28 0032-079X 180:1<19 1996 180 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer