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Boron reduces aluminum deposition in alkali-soluble pectin and cytoplasm to release aluminum toxicity.
Yan, Lei; Riaz, Muhammad; Liu, Jiayou; Liu, Yalin; Zeng, Yu; Jiang, Cuncang.
Afiliação
  • Yan L; Microelement Research Center, College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, PR China. Electronic address: yanlei2015@webmail.hzau.edu.cn.
  • Riaz M; Microelement Research Center, College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, PR China; Root Biology Center, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, PR China. Electronic address: riaz1480@hotm
  • Liu J; Microelement Research Center, College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, PR China. Electronic address: ljiayou@163.com.
  • Liu Y; Microelement Research Center, College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, PR China. Electronic address: liuyalin@webmail.hzau.edu.cn.
  • Zeng Y; Microelement Research Center, College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, PR China. Electronic address: 2018303110055@webmail.hzau.edu.cn.
  • Jiang C; Microelement Research Center, College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, 430070, PR China. Electronic address: jcc2000@mail.hzau.edu.cn.
J Hazard Mater ; 401: 123388, 2021 01 05.
Artigo em Inglês | MEDLINE | ID: mdl-32653794
ABSTRACT
Boron (B) is indispensable for plant growth and has been reported in the mitigation of aluminum (Al) toxicity in different plants. This study focused on the efficacy of B in reducing Al toxicity to trifoliate orange seedlings in a hydroponic experiment. Boron supply had a positive effect on root length and plant growth-related parameters and attenuated Al-induced inhibition of plasma membrane H+-ATPase activity. X-ray photoelectron spectroscopy (XPS) in conjunction with scanning electron microscope-energy dispersive x-ray spectrometer (SEM-EDS) revealed that B reduced Al accumulation in root cell wall, especially on pectin fractions (alkali-soluble pectin), accompanied by suppressing pectin synthesis, pectin methylesterase (PME) activity and PME expression. Furthermore, B application inhibited NRAT1 expression while increased ALS1 expression, indicating restraining Al transport from external cells to cytoplasm and accelerating accelerating vacuolar sequestration. The results were further demonstrated by transmission electron microscope-energy dispersive x-ray spectrometer (TEM-EDS) analysis. Taken together, our results indicated that B mainly promoted the efflux of H+ by regulating the plasma membrane H+-ATPase activity, and reduced the demethylation of pectin to weaken Al binding to carboxyl. More importantly, B alleviated some of the toxic effects of Al by compartmentalizing Al into vacuoles and decreasing the deposition of Al in cytoplasm.
Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: J Hazard Mater Assunto da revista: Saúde Ambiental Ano de publicação: 2021 Tipo de documento: Artigo

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: J Hazard Mater Assunto da revista: Saúde Ambiental Ano de publicação: 2021 Tipo de documento: Artigo