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| Cd-phytotoxicity Species Sensitivity Distributions and Root Cd Forms of Different Tobacco Cultivars |
| Received:July 27, 2015 |
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| KeyWord:tobacco cultivars;cadmium;species sensitivity distribution(SSD);translocation factors;binding forms |
| Author Name | Affiliation | E-mail | | LEI Li-ping | Yunnan Academy of Tobacco Sciences, Kunming 650021, China | | | LIU Bin | Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | CHEN Shi-bao | Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | chenshibao@caas.cn | | LI Ning | Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | ZHENG Han | Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | |
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| Abstract: |
| The dose-response curves and the species sensitivity distribution(SSD) model of Cd toxicity to 16 different tobacco cultivars were investigated in hydroponic culture using log logistic model and probability function(Burr-Ⅲ) model. The binding forms of Cd in the roots of varied Cd-sensitive tobaccos were further examined using sequential extraction method. Root elongation test showed that the thresholds(EC50) of Cd toxicity to tobacco were significantly different(P <0.05) among cultivars, with EC50 values ranging from 18.76~60.77 mg·L-1, a maximum variation of 223.9%. The cumulative frequencies of species sensitivity distributions of Cd toxicity varied significantly(P <0.05) among the tested tobacco cultivars. The most Cd-sensitive cultivar was Y85 but the highest Cd-tolerant one was K346. Percentages of insoluble phosphate Cd(PO4)n and pectin bound Cd were greater in Cd-tolerant cultivars(K346 and K326) than in Cd-sensitive cultivars of Y85 and TN86, implying that the formation of insoluble Cd in root cells may be one of tolerance mechanisms in Cd-tolerant tobaccos. |
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