https://scholars.lib.ntu.edu.tw/handle/123456789/417075
標題: | Field experiment for determining lead accumulation in rice grains of different genotypes and correlation with iron oxides deposited on rhizosphere soil | 作者: | CHIHHAO FAN Lai, Y.-C. Syu, C.-H. Wang, P.-J. Lee, D.-Y. Fan, C. DAR-YUAN LEE |
公開日期: | 2018 | 卷: | 610-611 | 起(迄)頁: | 845-853 | 來源出版物: | Science of the Total Environment | 摘要: | Paddy rice (Oryza sativa L.) is a major staple crop in Asia. However, heavy metal accumulation in paddy soil poses a health risk for rice consumption. Although plant uptake of Pb is usually low, Pb concentrations in rice plants have been increasing with Pb contamination in paddy fields. It is known that iron oxide deposits in the rhizosphere influence the absorption of soil Pb by rice plants. In this study, 14 rice cultivars bred in Taiwan, including ten japonica cultivars (HL21, KH145, TC192, TK9, TK14, TK16, TN11, TNG71, TNG84, and TY3) and four indica cultivars (TCS10, TCS17, TCSW2, and TNGS22), were used in a field experiment. We investigated the genotypic variation in rice plant Pb in relation to iron oxides deposited in the rhizosphere, as seen in a suspiciously contaminated site in central Taiwan. The results showed that the cultivars TCSW2, TN11, TNG71, and TNG84 accumulated brown rice Pb exceeding the tolerable level of 0.2 mg kg? 1. In contrast, the cultivars TNGS22, TK9, TK14, and TY3 accumulated much lower brown rice Pb (< 0.1 mg kg? 1); therefore, they should be prioritized as safe cultivars for sites with potential contamination. Moreover, the iron oxides deposited on the rhizosphere soil show stronger affinity to soil-available Pb than those on the root surface to form iron plaque. The relative tendency of Pb sequestration toward rhizosphere soil was negatively correlated with the Pb concentrations in brown rice. The iron oxides deposited on the rhizosphere soil but not on the root surface to form iron plaque dominate Pb sequestration in the rhizosphere. Therefore, the enhancement of iron oxide deposits on the rhizosphere soil could serve as a barrier preventing soil Pb on the root surface and result in reduced Pb accumulation in brown rice. ? 2017 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85027571777&doi=10.1016%2fj.scitotenv.2017.08.034&partnerID=40&md5=2011bf5f5d12d503956a7b41e4d9c2f8 https://scholars.lib.ntu.edu.tw/handle/123456789/417075 |
DOI: | 10.1016/j.scitotenv.2017.08.034 | SDG/關鍵字: | Bioaccumulation; Deposits; Health risks; Heavy metals; Iron deposits; Iron oxides; Soils; Contaminated sites; Field experiment; Genotypic variations; Heavy metal accumulation; Iron plaques; Paddy soils; Radial oxygen loss; Rhizosphere soils; Soil pollution; iron oxide; lead; ferric ion; ferric oxide; lead; bioaccumulation; biological uptake; deposition; genotype; heavy metal; iron oxide; lead; oxygen; paddy field; rhizosphere; rice; root; soil pollution; Article; bioaccumulation; controlled study; cultivar; genetic variability; genotype; nonhuman; priority journal; rhizosphere; rice; soil pollution; Taiwan; chemistry; genetics; Oryza; pharmacokinetics; plant root; rhizosphere; soil; soil pollutant; Taiwan; Japonica; Oryza sativa; Ferric Compounds; Genotype; Lead; Oryza; Plant Roots; Rhizosphere; Soil; Soil Pollutants; Taiwan |
顯示於: | 生物環境系統工程學系 |
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