Reducing arsenic in rice grains by leonardite and arsenic–resistant endophytic bacteria

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Dolphen R., Thiravetyan P.

ผู้เผยแพร่: Elsevier

ปีที่เผยแพร่ (ค.ศ.): 2019

วารสาร: Chemosphere (0045-6535)

Volume number: 223

หน้าแรก: 448

หน้าสุดท้าย: 454

จำนวนหน้า: 7

นอก: 0045-6535

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85062147875&doi=10.1016%2fj.chemosphere.2019.02.054&partnerID=40&md5=9a0d8402475a4d96f0903360e23e86d3

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

Arsenic contaminated in rice plants can cause many physiological, biochemical and productivity in rice. This also had a negative impact on human health. To decrease arsenic in grains, a combination of leonardite as amendment and arsenic-resistance endophytic bacteria was investigated. The results showed that 1% (w/v) leonardite (91.86 ± 2.04%) had the highest efficiency in adsorbing initial arsenic concentration of 2 mg L−1, which was higher than bagasse fly ash (16.25 ± 3.97%), rice husk ash (10.36 ± 1.28%), and sawdust fly ash (63.00 ± 5.67%) under the same condition. This was due to the higher aluminium and iron contents of leonardite strongly binding to arsenic anions. Meanwhile, Bacillus pumilus had an ability to decrease arsenic accumulation in rice grains to levels below those achieved by Pseudomonas sp. and Bacillus thuringiensis. This was possibly due to B. pumilus producing higher siderophore. Interestingly, a combination of microbe and leonardite addition could decrease arsenic accumulation in grains to below the permissible limit (0.2 mg As kg−1 for inorganic arsenic). It could also reduce oxidative stress and showed down-regulation of Lsi1, Lsi2 and OsPT4 at the heading stage, which coincided with low arsenic and high silicon accumulation in roots. Therefore, this result could be used to decrease arsenic accumulation in grains in arsenic-contaminated paddy fields, improved rice plants defense and endured of arsenic stress, and increased rice productivity. © 2019 Elsevier Ltd

คำสำคัญ

Bacillus pumilus, Leonardite, Rice plant