Effects of silicon (Si) on arsenic (As) accumulation and speciation in rice (Oryza sativa L.) genotypes with different radial oxygen loss (ROL).
Effects of silicon (Si) on arsenic (As) accumulation and speciation in rice (Oryza sativa L.) genotypes with different radial oxygen loss (ROL).
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DOI：
10.1016/j.chemosphere.2015.06.081
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发表时间：
2015-11
期刊：
影响因子：
8.8
通讯作者：
Chuan Wu;Qi Zou;Sheng-guo Xue;Jing-yu Mo;Wei-song Pan;L. Lou;M. Wong
中科院分区：
文献类型：
--
作者：
Chuan Wu;Qi Zou;Sheng-guo Xue;Jing-yu Mo;Wei-song Pan;L. Lou;M. Wong
稻田土壤砷 (As) 污染对数以百万计以大米为主食的人们的健康产生了不利影响。本研究旨在研究硅（Si）施肥对不同径向氧损失（ROL）水稻植株砷吸收和形态形成的影响。将六种基因型在温室条件下种植在盆土中直至分蘖后期。结果表明，19.76~27μmol O2g−1根干重h−1范围内的杂交水稻基因型的ROL率高于9.55~15.41μmol O2g−1根干重h−1范围内的常规籼稻基因型。添加硅显着增加了秸秆生物量（p < 0.005），但对根生物量没有显着影响。在 40 毫克砷/千克土壤中生长的六种基因型中，施硅显着降低了地上部和根部总砷浓度 (p< 0.001)。添加Si使ROL较低的‘香风优9号’和ROL较高的‘香晚鲜12号’地上部无机砷分别降低了31%和25%，并有增加DMA浓度的趋势。通过施硅肥和选择径向氧损失高的基因型相结合，有望有效减少水稻砷污染。
Arsenic (As) contamination of paddy soils has adversely affected the health of millions of people those consuming rice for staple food. The present study was aimed at investigating the effects of silicon (Si) fertilization on As uptake, speciation in rice plants with different radial oxygen loss (ROL). Six genotypes were planted in pot soils under greenhouse conditions until late tillering state. The results showed that the rates of ROL were higher in hybrid rice genotypes varying from 19.76 to 27 μmol O2g−1root dry weight h−1than that in conventional indica rice genotypes varying from 9.55 to 15.41 μmol O2g−1root dry weight h−1. Si addition significantly increased straw biomass (p< 0.005), but with no significant effects on root biomass. Si fertilization significantly reduced shoot and root total As concentrations (p< 0.001) in six genotypes grown in 40 mg As/kg soil. Si addition decreased the inorganic As in shoots of ‘Xiangfengyou-9’ with lower ROL and ‘Xiangwanxian-12’ with higher ROL by 31% and 25% respectively and had the tendency to increase DMA concentrations. It is potential to reduce As contamination of rice efficiently by combining Si fertilization and selecting genotypes with high radial oxygen loss.