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Nanoscale Sulfur Improves Plant Growth and Reduces Arsenic Toxicity and Accumulation in Rice (Oryza sativa L.)

文献类型： 外文期刊

作者： Meselhy, Ahmed G. 1 ; Sharma, Sudhir 1 ; Guo, Zhi 1 ; Singh, Gurpal 1 ; Yuan, Haiyan 1 ; Tripathi, Rudra D. 5 ; Xing, 1 ;

作者机构： 1.Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA

2.Al Azhar Univ, Fac Agr, Dept Biotechnol, Cairo 11651, Egypt

3.Jiangsu Acad Agr Sci, Minist Agr, Inst Agr Resources & Environm, Key Lab Crop & Anim Integrated Farming, Nanjing 210014, Peoples R China

4.Jiangsu Prov & Chinese Acad Sci, Inst Bot, Nanjing 210014, Peoples R China

5.CSIR Natl Bot Res Inst, Lucknow 226001, Uttar Pradesh, India

6.Connecticut Agr Expt Stn, New Haven, CT 06511 USA

关键词： Oryza sativa; arsenic; accumulation; productivity; food safety; nanoscale sulfur; nanofertilizer

期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：9.028； 五年影响因子：9.922 ）

ISSN： 0013-936X

年卷期： 2021 年 55 卷 20 期

页码：

收录情况： SCI

摘要： Rice is known to accumulate arsenic (As) in its grains, posing serious health concerns for billions of people globally. We studied the effect of nanoscale sulfur (NS) on rice seedlings and mature plants under As stress. NS application caused a 40% increase in seedling biomass and a 26% increase in seed yield of mature plants compared to untreated control plants. AsIII exposure caused severe toxicity to rice; however, coexposure of plants to AsIII and NS alleviated As toxicity, and growth was significantly improved. Rice seedlings treated with AsIII + NS produced 159 and 248% more shoot and root biomass, respectively, compared to plants exposed to AsIII alone. Further, AsIII + NS-treated seedlings accumulated 32 and 11% less As in root and shoot tissues, respectively, than the AsIII-alone treatment. Mature plants treated with AsIII + NS produced 76, 110, and 108% more dry shoot biomass, seed number, and seed yield, respectively, and accumulated 69, 38, 18, and 54% less total As in the root, shoot, flag leaves, and grains, respectively, compared to AsIII-alone-treated plants. A similar trend was observed in seedlings treated with AsV and NS. The ability of sulfur (S) to alleviate As toxicity and accumulation is clearly size dependent as NS could effectively reduce bioavailability and accumulation of As in rice via modulating the gene expression activity of As transport, S assimilatory, and glutathione synthesis pathways to facilitate AsIII detoxification. These results have significant environmental implications as NS application in agriculture has the potential to decrease As in the food chain and simultaneously enable crops to grow and produce higher yields on marginal and contaminated lands.

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