Physiological, biochemical and growth responses of Italian ryegrass to butachlor exposure

Wang, Shaorui and Li, Huashou and Lin, Chuxia (2013) Physiological, biochemical and growth responses of Italian ryegrass to butachlor exposure. Pesticide Biochemistry and Physiology , 106 (1-2). pp. 21-27. ISSN 0048-3575

Abstract

A dose-response experiment was conducted to examine the effects of butachlor on the growth, physiology and biochemistry of Italian ryegrass. The plant suffered a >50% reduction in fresh biomass when exposed to a butachlor dose of 5mgL-1. However, a significant further biomass reduction only occurred when the dosage level of butachlor was increased to 40mgL-1. The root was more sensitive than the shoot to butachlor toxicity. It appears that the inhibition of fine root development under butachlor stress was the upstream cause for the retarded plant growth. A butachlor dose of 5mgL-1 was sufficiently high to cause significant H2O2-induced oxidative damage in the plant cells, as indicated by the increased MDA and the lower production rate relative to consumption rate of CAT. The plants tended to maintain sufficiently high levels of root activity and photosynthesis, and possibly relied on these mechanisms for survival in such a stressed environment. Butachlor had a stimulatory effect on the release of dissolved organic carbon but not amino acids from the plant roots. There were 5 types of organic acids in the root exudates, which all exhibited a trend to decrease with increasing level of butachlor.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2013 Elsevier Inc. Published version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - USQ Other
Date Deposited: 18 Jul 2013 03:55
Last Modified: 14 Jul 2014 06:19
Uncontrolled Keywords: antioxidant enzymes; butachlor; Italian ryegrass; plant growth; root exudates
Fields of Research : 06 Biological Sciences > 0603 Evolutionary Biology > 060303 Biological Adaptation
06 Biological Sciences > 0607 Plant Biology > 060704 Plant Pathology
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Socio-Economic Objective: D Environment > 96 Environment > 9604 Control of Pests, Diseases and Exotic Species > 960413 Control of Plant Pests, Diseases and Exotic Species in Farmland, Arable Cropland and Permanent Cropland Environments
Identification Number or DOI: 10.1016/j.pestbp.2013.03.007
URI: http://eprints.usq.edu.au/id/eprint/23765

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