title: Physiological analyses indicate superoxide dismutase, catalase, and phytochelatins play important roles in Pb tolerance in Eremochloa ophiuroides.
abstract: Phytoremediation is considered to be a promising approach to restore or stabilize soil contaminated by lead (Pb). Turfgrasses, due to their high biomass yields, are considered to be suitable for use in phytoextraction of soil contaminated with heavy metal. It has been demonstrated that centipedegrass (Eremochloa ophiuroides (Munro) Hack., Poaceae) is a good turfgrass for restore of soil contaminated by Pb. However, the enhanced tolerant mechanisms in metallicolous (M) centipedegrass accessions remain unknown. In this study, we made a comparative study of growth performance, Pb accumulation, antioxidant levels, and phytochelatin concentrations in roots and shoots from M and nonmetallicolous (NM) centipedegrass accessions. Results showed that turf quality and growth rate were less repressed in M accessions than in NM accession. Pb stress caused generation of reactive oxygen species in centipedegrass with relatively lower levels in M accessions. Antioxidant activity analysis indicated that superoxide dismutase and catalase played important roles in Pb tolerance in M accessions. M accessions accumulated more Pb in roots and shoots. Greatly increased phytochelatins and less repressed sulfur contents in roots and shoots of M accessions indicated that they correlated with Pb accumulation and tolerance in centipedegrass.
authors.affiliation: a College of Landscape Architecture , Sichuan Agricultural University , Wenjiang , Sichuan , P. R. China.
authors.forename: Xi
authors.initials: X
authors.lastname: Li
authors.affiliation: a College of Landscape Architecture , Sichuan Agricultural University , Wenjiang , Sichuan , P. R. China.
authors.forename: Huameng
authors.initials: H
authors.lastname: Cen
authors.affiliation: b Chengdu Tian-kai-jin-cheng Plant Technology Co. Ltd , Chengdu , Sichuan , P. R. China.
authors.forename: Youxiang
authors.initials: Y
authors.lastname: Chen
authors.affiliation: a College of Landscape Architecture , Sichuan Agricultural University , Wenjiang , Sichuan , P. R. China.
authors.forename: Siying
authors.initials: S
authors.lastname: Xu
authors.affiliation: a College of Landscape Architecture , Sichuan Agricultural University , Wenjiang , Sichuan , P. R. China.
authors.forename: Lingli
authors.initials: L
authors.lastname: Peng
authors.affiliation: a College of Landscape Architecture , Sichuan Agricultural University , Wenjiang , Sichuan , P. R. China.
authors.forename: Hanmingyue
authors.initials: H
authors.lastname: Zhu
authors.affiliation: c Business School , Sichuan Agricultural University , Dujiangyan , Sichuan , P. R. China.
authors.forename: Yiqiao
authors.initials: Y
authors.lastname: Li
mesh_terms: D001673:Biodegradation, Environmental; D002374:Catalase / Q000378:metabolism*; D007854:Lead / Q000378:metabolism*; D054811:Phytochelatins / Q000378:metabolism*; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism; D006109:Poaceae / Q000254:growth & development / Q000378:metabolism*; D012989:Soil Pollutants / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000378:metabolism*
chemical_list: D012989:Soil Pollutants; D007854:Lead; D054811:Phytochelatins; D002374:Catalase; D013482:Superoxide Dismutase
keywords: Eremochloa ophiuroides; antioxidant enzymes; centipedegrass; lead; phytoremediation; stress response