Mn accumulation and tolerance in Celosia argentea Linn.: a new Mn-hyperaccumulating plant species.
Identifying a hyperaccumulator is an important groundwork for the phytoextraction of heavy metal-contaminated soil. Celosia argentea Linn., which grew on a Mn tailing wasteland, was found to hyperaccumulate Mn (14 362mgkg(-1) in leaf dry matter) in this study. To investigate Mn tolerance and accumulation in C. argentea, a hydroponic culture experiment was conducted in a greenhouse. Results showed that the biomass and the relative growth rate of C. argentea were insignificantly different (p>0.05) at the Mn supply level ranging from 2.5mgL(-1) (control) to 400mgL(-1). Manganese concentrations in leaves, stems, and roots reached maxima of 20228, 8872, and 2823mgkg(-1) at 600mgMnL(-1), respectively. The relative rate of Mn accumulation increased by 91.2% at 400mgMnL(-1). Over 95% of the total Mn taken up by C. argentea was translocated to shoots. Thus, C. argentea exhibits the basic characteristics of a Mn-hyperaccumulator. This species has great potential to remediate Mn-contaminated soil cheaply and can also aid the studies of Mn uptake, translocation, speciation, distribution and detoxification in plants.
Guangxi Scientific Experiment Center of Mining, Metallurgy, and Environment, Guilin University of Technology, Guilin, Guangxi 541004, China. Electronic address: Liu-j7775@163.com.
Jie
J
Liu
Guangxi Scientific Experiment Center of Mining, Metallurgy, and Environment, Guilin University of Technology, Guilin, Guangxi 541004, China.
Weiwei
W
Shang
Guangxi Scientific Experiment Center of Mining, Metallurgy, and Environment, Guilin University of Technology, Guilin, Guangxi 541004, China.
Xuehong
X
Zhang
Guangxi Scientific Experiment Center of Mining, Metallurgy, and Environment, Guilin University of Technology, Guilin, Guangxi 541004, China.
Yinian
Y
Zhu
Guangxi Scientific Experiment Center of Mining, Metallurgy, and Environment, Guilin University of Technology, Guilin, Guangxi 541004, China.
Ke
K
Yu
D018533:Biomass; D034762:Celosia / Q000378:metabolism*; D004787:Environmental Pollution; D052918:Environmental Restoration and Remediation / Q000379:methods; D018527:Hydroponics; D007700:Kinetics; D008345:Manganese / Q000378:metabolism* / Q000633:toxicity*; D008906:Mining; D012639:Seeds; D012987:Soil; D012989:Soil Pollutants / Q000032:analysis; D014018:Tissue Distribution
D012987:Soil; D012989:Soil Pollutants; D008345:Manganese
Celosia argentea Linn.; Hyperaccumulation; Manganese; Phytoremediation; Tolerance