CGA-43089 effects on metolachlor uptake and membrane permeability in grain sorghum ( Sorghum bicolor )

Ketchersid, M L and Vietor, M D and Merkle, M.G. (1982) CGA-43089 effects on metolachlor uptake and membrane permeability in grain sorghum ( Sorghum bicolor ). Journal of Plant Growth Regulation, 1. pp. 285-294.

[img] PDF - Published Version
Restricted to ICRISAT researchers only

Abstract

Phytotoxicity of metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide] toward grain sorghum [Sorghum bicolor (L.) Moench] increased as soil moisture increased. This was found with both unprotected sorghum and sorghum protected with 1.25 g CGA-43089 [α([cyanomethoxy]imino)benzeneacetonitrile] per kg of seed. However, under all conditions, metolachlor was less phytotoxic to protected sorghum than to unprotected sorghum. Metolachlor in sorghum coleoptiles increased as soil water increased. The rate of absorption of metolachlor and the total amount accumulated by excised sorghum coleoptiles was decreased by CGA-43089. Initial uptake of leucine by excised sorghum coleoptiles was decreased by metolachlor or metolachlor plus CGA-43089 but, after 24 h, uptake of leucine was increased by these treatments. Leucine incorporation into protein by coleoptiles was increased after 24 h treatment with CGA-43089. The apparent competitive effect of CGA-43089 on the absorption of metolachlor was most evident in the roots. Leakage of photosynthate from roots was highest following treatment with both CGA-43089 and metolachlor. Metolachlor did not increase leakage of labeled carbon from roots as compared with the control. These data indicate that the decreased rate of uptake of metolachlor in the presence of CGA-43089 was not a direct effect on cell permeability.

Item Type: Article
Author Affiliation: Soil and Crop Sciences Department, Texas A&M University, Texas 77843, USA
Subjects: Plant Production > Croping Systems
Divisions: Sorghum
Depositing User: Library ICRISAT-InfoSAT
Date Deposited: 20 Mar 2012 13:58
Last Modified: 20 Mar 2012 13:58
Official URL: http://dx.doi.org/10.1007/BF02498657
URI: http://eprints.icrisat.ac.in/id/eprint/4008

Actions (login required)

View Item View Item
EPrints Logo
eprints is powered by EPrints 3 which is developed by the School of Electronics and Computer Science at the University of Southampton. More information and software credits.