Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, Hong Kong Special Administrative Region, PR China.
School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, People's Republic of China.
Environ Pollut. 2022 Oct 1;310:119829. doi: 10.1016/j.envpol.2022.119829. Epub 2022 Jul 30.
The natural occurrence of arsenic (As) in groundwater & soils and its bioaccumulation in rice grains is a major health concern worldwide. To combat the problem, best combination of irrigation management and suitable rice variety altering As content in grains must be ensured. With this aim, a field trial was conducted with two rice varieties and water management including alternate wetting and drying (AWD) and continuous flooding (CF) irrigation regimes with As contaminated groundwater (AsW) and temporarily stored groundwater (TSG) and river water for only CF (as control). Results revealed that As content in different portions of paddy plant was significantly different (P < 0.001) with irrigation practices and rice varieties. AWD irrigation with TSG accumulated lower As in rice grains compared with CF-AsW for both varieties. Data showed that AWD-TSG practice led to 61.37% and 60.34% grain As reduction for BRRI dhan28 and BRRI dhan29, respectively, compared with CF-AsW. For Principle Component Analysis (PCA), first principle component (PC1) explained 91.7% of the variability and irrigation water As, soil total and available As, straw As, root As and husk As were the dominating parameters. With significant (P < 0.05) variation in yields between the genotypes, AWD increased grain yield by 29.25% in BRRI dhan29 Compared with CF. However, translocation factor (TF) and bioconcentration factor (BCF) for both varieties were less than one for all the treatments. The addition of this study to our knowledge base is that, AWD-TSG with BRRI dhan29 can be an As-safe practice without compromising yields.
砷（As）在地下水和土壤中的自然存在及其在稻谷中的生物累积是全球主要的健康关注点。为了解决这个问题，必须确保灌溉管理和适宜的水稻品种的最佳组合能够改变稻谷中的砷含量。为此，进行了一项田间试验，使用两种水稻品种和包括交替湿润和干燥（AWD）和连续淹水（CF）灌溉制度的水管理，以及受砷污染的地下水（AsW）和临时储存的地下水（TSG）和仅用于 CF 的河水（作为对照）。结果表明，不同水稻植株部位的砷含量因灌溉方式和水稻品种的不同而有显著差异（P<0.001）。与 CF-AsW 相比，AWD 灌溉 TSG 会使两种品种的稻谷中砷含量降低。数据表明，与 CF-AsW 相比，AWD-TSG 可使 BRRI dhan28 和 BRRI dhan29 的稻谷砷含量分别降低 61.37%和 60.34%。主成分分析（PCA）表明，第一主成分（PC1）解释了 91.7%的变异性，灌溉水中的砷、土壤总砷和有效砷、稻草砷、根砷和稻壳砷是主要参数。基因型之间的产量有显著差异（P<0.05），与 CF 相比，AWD 使 BRRI dhan29 的稻谷产量增加了 29.25%。然而，两种品种的迁移因子（TF）和生物浓缩因子（BCF）都小于所有处理的 1。本研究的加入增加了我们的知识库，即 AWD-TSG 与 BRRI dhan29 结合可以在不影响产量的情况下实现砷安全。
