Cai Quan-Ying, Xiao Pei-Yun, Chen Tong, Lü Huixiong, Zhao Hai-Ming, Zeng Qiao-Yun, Li Yan-Wen, Li Hui, Xiang Lei, Mo Ce-Hui
Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation of Guangdong Higher Education Institutions, School of Environment, Jinan University, Guangzhou 510632, China.
Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation of Guangdong Higher Education Institutions, School of Environment, Jinan University, Guangzhou 510632, China; Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong Higher Education Institutions, College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
Ecotoxicol Environ Saf. 2015 Jun;116:50-8. doi: 10.1016/j.ecoenv.2015.02.038. Epub 2015 Mar 10.
Agricultural soil in China contains high levels of di-(2-ethylhexyl) phthalate (DEHP), especially in paddy-field soil of Guangdong province of China, but the accumulation and translocation of DEHP by rice (Oryza sativa L.) remains unknown. In the present study, twenty rice cultivars were cultivated in paddy soil spiked with DEHP, and variations in DEHP accumulation and translocation among various cultivars were investigated. Our results showed that DEHP concentrations in roots and shoots of different rice cultivars at four growth stages (i.e., ripening, tillering, jointing, and flowering stages) varied greatly from 0.26 to 11.8 mg/kg (dry weight, dw) and 0.40 to 7.58 mg/kg (dw), respectively. No obvious change over time was observed. The greatest variation in DEHP concentrations among the rice cultivars occurred at ripening stage, whereas the lowest variation at flowering stage. During ripening stage, the largest variation in DEHP concentrations among cultivars were observed in stems (varying from 0.35 to 13.2 mg/kg), whereas the least one was observed in roots (ranging from 1.01 to 5.72 mg/kg). Significant differences in DEHP concentrations in the roots, stems, leaves and grains of most rice cultivars were found. The translocation factors of DEHP from roots to stems or stems to leaves were higher than those from shoots to grains. Overall, cultivars Tianfengyou 316, Wuyou 308, and Peizataifeng, which contained low levels of DEHP in grains but high levels in shoots, were ideal cultivars for simultaneous production of safe food and phytoremediation of contaminated soil.
中国农业土壤中邻苯二甲酸二（2-乙基己基）酯（DEHP）含量较高，尤其是中国广东省的稻田土壤，但水稻（Oryza sativa L.）对DEHP的积累和转运情况尚不清楚。在本研究中，在添加了DEHP的稻田土壤中种植了20个水稻品种，并研究了不同品种间DEHP积累和转运的差异。我们的结果表明，在四个生长阶段（即成熟期、分蘖期、拔节期和开花期），不同水稻品种根和地上部的DEHP浓度差异很大，根中DEHP浓度为0.26至11.8毫克/千克（干重），地上部为0.40至7.58毫克/千克（干重）。未观察到随时间的明显变化。水稻品种间DEHP浓度的最大差异出现在成熟期，而开花期差异最小。在成熟期，各品种间DEHP浓度差异最大的是茎（0.35至13.2毫克/千克），而根中差异最小（1.01至5.72毫克/千克）。发现大多数水稻品种的根、茎、叶和籽粒中DEHP浓度存在显著差异。DEHP从根到茎或从茎到叶的转运系数高于从地上部到籽粒的转运系数。总体而言，天丰优316、五优308和培杂泰丰这几个品种籽粒中DEHP含量低但地上部含量高，是同时生产安全食品和对污染土壤进行植物修复的理想品种。
