Schematic diagram showing the mechanisms for mitigation of inorganic As accumulation in rice grains by rhizosphere processes and in-vivo transport with synergistic application of Si. (IMAGE)
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Schematic diagram showing the mechanisms for mitigation of inorganic As accumulation in rice grains by rhizosphere processes and in-vivo transport with synergistic application of Si. Synergistic Si application decreased As concentration on root surface with reductive dissolution of Fe plaque by enhancing root suberization. The strengthened root suberization along with reduced expression of Lsi6 gene in roots critically inhibited As influx into root cells. This coincided with the significantly decreased As concentration in the basal stems of rice plants in R-F treatment by X-ray fluorescence spectrometry analysis. Only with the synergistic application of Si-rich combusted rice husk (CRH) and foliar Si spraying did the downregulated expression of Lsi6 occur in node I, which further restricted As unloading into grains. CK = control without application of Si and CRH; R-F = root application of CRH plus foliar application of CRH-derived Si; ROL = radial oxygen loss.
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Pedosphere
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