Accumulation of silicon in shoots is required for reducing lead uptake in rice

IF 6 1区 农林科学 Q1 AGRONOMY Crop Journal Pub Date : 2023-08-01 DOI:10.1016/j.cj.2022.09.014
Xiuxiu Gong , Fan Yang , Xianyu Pan, Jifeng Shao
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引用次数: 2

Abstract

Silicon (Si) treatment has been shown to reduce the toxicity and accumulation of lead (Pb) in many plants, including rice. The mechanisms responsible for this effect are poorly understood. We investigated the effects of Si treatment on Pb toxicity and accumulation in two rice mutants (lsi1 and lsi2) defective in Si uptake and in their wild types. Si did not alleviate Pb-induced inhibition of root elongation in short-term experiments, but reduced Pb accumulation in wild types, but not in mutants, in long-term experiments. Pre-treatment with Si reduced Pb concentration in xylem sap and Pb accumulation in wild types but not in mutants. In split-root experiments, Si treatment reduced Pb accumulation but did not alter Pb localization in roots. Si treatment suppressed the expression of many genes encoding proteins that may participate in Pb uptake and transport in the wild type, but not in the lsi1 mutant. These results indicate that Si accumulation in shoots is required to reduce Pb uptake in rice and that the effect is achieved via Si-induced suppression of genes encoding proteins involved in Pb uptake and/or transport.

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减少水稻对铅的吸收需要在芽中积累硅
硅处理已被证明可以降低包括水稻在内的许多植物中铅的毒性和积累。人们对造成这种影响的机制知之甚少。我们研究了硅处理对两个缺硅水稻突变体(lsi1和lsi2)及其野生型铅毒性和积累的影响。Si在短期实验中没有减轻Pb诱导的根伸长抑制,但在长期实验中减少了Pb在野生型中的积累,而在突变体中没有。Si预处理降低了野生型木质部汁液中的Pb浓度和Pb积累,但没有降低突变体中的Pb含量。在裂根实验中,Si处理减少了Pb的积累,但没有改变Pb在根中的定位。Si处理抑制了许多编码蛋白质的基因的表达,这些蛋白质在野生型中可能参与Pb的摄取和转运,但在lsi1突变体中没有。这些结果表明,减少水稻对Pb的吸收需要在芽中积累Si,并且这种效果是通过Si诱导的对编码参与Pb吸收和/或转运的蛋白质的基因的抑制来实现的。
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来源期刊
Crop Journal
Crop Journal Agricultural and Biological Sciences-Agronomy and Crop Science
CiteScore
9.90
自引率
3.00%
发文量
638
审稿时长
41 days
期刊介绍: The major aims of The Crop Journal are to report recent progresses in crop sciences including crop genetics, breeding, agronomy, crop physiology, germplasm resources, grain chemistry, grain storage and processing, crop management practices, crop biotechnology, and biomathematics. The regular columns of the journal are Original Research Articles, Reviews, and Research Notes. The strict peer-review procedure will guarantee the academic level and raise the reputation of the journal. The readership of the journal is for crop science researchers, students of agricultural colleges and universities, and persons with similar academic levels.
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