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| Physiological Responses of Pennisetum spp. to Cadmium Stress in Three Types of Soils |
| Received:June 04, 2015 |
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| KeyWord:Pennisetum spp;Cd stress;growth;physiological response;soil type |
| Author Name | Affiliation | E-mail | | WANG Li-ping | Institute of Ecology & Forestry, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Jian | Institute of Ecology & Forestry, Sichuan Agricultural University, Chengdu 611130, China
College of Forestry, Sichuan Agricultural University, Chengdu 611130, China | sicauzhangjian@163.com | | HU Hong-ling | College of Forestry, Sichuan Agricultural University, Chengdu 611130, China | | | JIANG Xiao-mei | College of Forestry, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Ru-yi | College of Forestry, Sichuan Agricultural University, Chengdu 611130, China | | | HE Shu-hui | Institute of Ecology & Forestry, Sichuan Agricultural University, Chengdu 611130, China | | | SONG Jun-xiang | Sichuan Yingji New Energy Investment Co, LTD, Chengdu 610000, China | | | ZHANG Xue-cai | Sichuan Yingji New Energy Investment Co, LTD, Chengdu 610000, China | |
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| Abstract: |
| Pennisetum spp is an adversity-resistant perennial energy plant. However, there is little information available about its physical responses to cadmium(Cd) stresses. A pot experiment was designed to study the effects of Cd at different concentrations(0, 20, 50 and 100 mg·kg-1) on the growth and physiological indexes, including antioxidant enzyme activity, and MDA, soluble sugar, soluble protein and chlorophyll content of Pennisetum spp grown in three types of soils(alluvial soil, purple soil and yellow soil). Results showed that the growth of Pennisetum spp was not significantly influenced by Cd up to 20 mg·kg-1, but it was significantly inhibited at higher Cd concentrations in all three soils. The belowground and aboveground biomass of Pennisetum spp decreased with increasing Cd concentrations. Such reduction was in order of yellow soil >purple soil >alluvial soil. The content of Cd in Pennisetum spp increased with increasing Cd concentrations, with increment being yellow soil >purple soil >alluvial soil. The activities of superoxide dismutase(SOD), peroxidase(POD) and catalase(CAT)increased at low Cd but decreased at high Cd concentrations. As Cd concentrations increased, soluble protein decreased whereas soluble sugar and malondialdehyde(MDA) increased. Overall, Pennisetum spp had certain tolerance to and absorption and bioaccumulation of Cd in contaminated soils. The physiological responses of Pennisetum spp to Cd were different among three soils. Antioxidant enzyme activity and MDA content were lower, but soluble protein and chlorophyll content was higher in alluvial soil than in other two soils. |
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