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| Effects of Soil Sterilization and Fungicide Application on Growth and Heavy Metal Accumulation of Alfalfa (Medicago sativa L.) |
| Received:October 19, 2014 |
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| KeyWord:soil sterilization;benomyl;biomass;antioxidant physiology;heavy metal accumulation |
| Author Name | Affiliation | E-mail | | HE Yong-mei | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | YANG Zhi-xin | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | QIN Li | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Cheng-xue | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZU Yan-qun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHAN Fang-dong | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | zfd97@ynau.edu.cn |
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| Abstract: |
| Research has shown that soil microbes have profound impacts on plant tolerance to heavy metals. A greenhouse experiment was carried out to investigate the effects of soil sterilization and fungicide(benomyl) application on growth, antioxidant physiology and heavy metal accumulation of alfalfa(Medicago sativa L.) grown in heavy metals-polluted soils from a lead-zinc mining area of Huize, Yunnan Province. Soil sterilization significantly increased malondialdehyde(MDA) content by 44%, but decreased -SH content by 54%, chlorophyll a by 27%, chlorophyll b by 23%, and carotenoid content by 30%. Plant height, shoot biomass and root biomass were also reduced by soil sterilization by 45%, 74% and 85%, respectively. Both soil sterilization and benomyl application led to a significant increase in available Pb in soils and Pb content in alfalfa roots but a decrease in Zn content in the roots. In addition, soil sterilization significantly increased Cd content of alfalfa shoots. The accumulation of Pb, Zn, Cd and Cu in alfalfa was significantly decreased by soil sterilization by 74%, 78%, 68% and 76%, respectively. Applying benomyl did not significantly affect growth, antioxidant physiology, and heavy metal accumulation of alfalfa. These results indicate that soil microbial elimination reduces plant's ability to tolerate and accumulate heavy metals. |
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