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| Combined Effects of Perchlorate and Lead on Seedling Growth of Eight Ipomoea aquatica Forsskal Varieties |
| Received:September 28, 2014 |
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| KeyWord:perchlorate;lead;combined pollution;Ipomoea aquatica Forsskal;interaction |
| Author Name | Affiliation | E-mail | | ZHANG Ru | College of Agriculture, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China | | | CHEN Gui-kui | College of Agriculture, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China | guikuichen@scau.edu.cn | | LI Hua-shou | College of Agriculture, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China | | | HE Hong-zhi | College of Agriculture, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China | | | ZHANG Ze-min | College of Agriculture, South China Agricultural University, Guangzhou 510642, China | zmzhang@scau.edu.cn |
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| Abstract: |
| Perchloratte(ClO4-) and lead(Pb) are both inorganic contaminants in soils. However, their interactive effects on plants have not been well investigated. Here the root length, shoot length and biomass of 8 Ipomoea aquatica Forsskal varieties were examined under different rates of ClO4- and Pb and their combinations. Results showed that increasing ClO4-, Pb, and ClO4- +Pb concentrations increased inhibitory effects on the root length, shoot length and fresh weight of I. aquatica seedlings, with the most obvious inhibition found in the root length, in which a significant dose-effect relationship(P<0.05) was present. Different varieties of I. aquatica responded differently to ClO4- and Pb. The root lengths of Thailand and wide-leaf white skin(Hong Kong) I. aquatica were only 31.66% and 38.64% of that of the controls. The interaction of ClO4- and Pb showed synergism for most varieties of I. aquatica at low concentrations, but antagonism at higher concentrations. The narrow-leaf(Thailand), narrow-leaf green-skin(Hong Kong) and narrow-leaf white-skin I. aquatica were relatively tolerant to, whereas the Thailand and wide-leaf white-skin(Hong Kong) varieties were susceptible to perchlorate and lead stresses. |
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