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| Influence of lead stress on the ascorbate-glutathione cycle and subcellular distribution in leaves and roots of Pogonatherum crinitum |
| Received:September 29, 2017 |
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| KeyWord:Pogonatherum crinitum;Pb stress;ascorbate-glutathione cycle;subcellular distribution |
| Author Name | Affiliation | E-mail | | HAN Hang | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | CHEN Shun-yu | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | ZHAO Ya-man | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | HOU Xiao-long | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
College of Resources and Environmental Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Cross-Strait Collaborative Innovation Center of Soil and Water Conservation, Fuzhou 350002, China | xl.hou@fafu.edu.cn | | CAI Li-ping | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Cross-Strait Collaborative Innovation Center of Soil and Water Conservation, Fuzhou 350002, China | | | LIU Ai-qin | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Cross-Strait Collaborative Innovation Center of Soil and Water Conservation, Fuzhou 350002, China | | | ZHOU Chui-fan | College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Cross-Strait Collaborative Innovation Center of Soil and Water Conservation, Fuzhou 350002, China | |
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| Abstract: |
| Pogonatherum crinitum, an effective plant for phytoremediation, can grow in soils polluted with heavy metals and subsequently accumulate large amounts of heavy metals. In order to understand its response to heavy metal stress, a pot culture experiment was carried out at different lead concentrations. The results showed that the contents of glutathione reductase(GR), glutathione(GSH), ascorbic acid(AsA) in the leaves of P. crinitum were higher than those of the control samples under low Pb concentrations(1000 mg·kg-1), but not significantly. The contents of GR, AsA, and ascorbate peroxidase(APX) in the roots significantly increased by 41.1%, 60.6%, and 74.0%, respectively, compared with those of the control samples. Low Pb concentrations had certain promotional effects on the total root length, root surface area, root mean diameter, and root volume. However, increasing Pb concentrations caused inhibitory effects on the plant, with the total root length, root surface area, and root volume decreasing significantly. In addition, increased subcellular damage occurred in the leaves and roots under high Pb concentrations(2000, 3000 mg·kg-1). The contents of GR, GSH, and AsA in the leaves and roots of P. crinitum were higher than those in the control samples under high Pb treatments and the Pb contents in cell wall and soluble constituent subcellular components accounted for over 69% of the total. These findings indicated that P. crinitum adapted to the Pb stress by inducing the ascorbate-glutathione(AsA-GSH) cycle and by changing the subcellular distribution of Pb, which showed potential application in the remediation of Pb-polluted soil. |
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