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

Wang, S; Li, H; Lin, C

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 5 mg L�1. However, a significant further biomass reduction only occurred
when the dosage level of butachlor was increased to 40 mg L�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 5 mg L�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.

Citation

Wang, S., Li, H., & Lin, C. (2013). Physiological, biochemical and growth responses of Italian ryegrass to butachlor exposure. Pesticide Biochemistry and Physiology, 106(1-2), 21-27. https://doi.org/10.1016/j.pestbp.2013.03.007

• Journal Article Type: Article
• Acceptance Date: Mar 11, 2013
• Publication Date: Mar 25, 2013
• Deposit Date: Mar 22, 2016
• Journal: Pesticide Biochemistry and Physiology
• Print ISSN: 0048-3575
• Electronic ISSN: 1095-9939
• Publisher: Elsevier
• Volume: 106
• Issue: 1-2
• Pages: 21-27
• DOI: https://doi.org/10.1016/j.pestbp.2013.03.007
• Publisher URL: http://dx.doi.org/10.1016/j.pestbp.2013.03.007
• Related Public URLs: http://www.journals.elsevier.com/pesticide-biochemistry-and-physiology/