Silicon-Mediated Amelioration of Fe2+ Toxicity in Rice (Oryza sativa L.) Roots
Silicon-Mediated Amelioration of Fe2+ Toxicity in Rice (Oryza sativa L.) Roots
复制标题
硅介导改善水稻 (Oryza sativa L.) 根部 Fe2+ 毒性
DOI：
10.1016/s1002-0160(12)60065-4
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发表时间：
2012-12-01
期刊：
影响因子：
5.7
通讯作者：
Cai Kun-Zheng
中科院分区：
文献类型：
--
作者：
Fu You-Qiang;Shen Hong;Cai Kun-Zheng
硅（Si）可以增强植物对许多非生物胁迫的抗性。为了探究Si是否能改善Fe2+毒性，本研究通过水培试验研究了Si是否以及如何解毒水稻（Oryza sativa L.）根系中的Fe2+毒性。结果表明，天佑998 （TY998）对Fe2+毒性的敏感性高于培子泰丰（PZTF）。0.1 mmol L-1 Fe2+处理显著抑制TY998根伸长和根生物量。两个品种根表面均形成微红色铁斑。TY998的铁斑块数量高于PZTF。在铁处理溶液中添加Si可使水稻根表面铁膜数量减少17.6% ~ 37.1%，根系铁吸收量减少37.0% ~ 40.3%，并使TY998因Fe2+中毒引起的根系伸长恢复13.5%。与铁处理相比，在铁处理溶液中添加1 mmol L-1 Si使木质部液流增加19.3% ~ 24.8%，根尖铁运输增加45.0% ~ 78.6%。此外，在铁溶液中添加硅可以诱导根细胞壁增厚。上述结果表明，硅能够解毒，硅介导的水稻根中铁毒性的改善与根表面铁斑块减少和铁从根到茎的运输增加有关。
Silicon (Si) can enhance the resistance of plants to many abiotic stresses. To explore whether Si ameliorates Fe2+ toxicity, a hydroponic experiment was performed to investigate whether and how Si detoxifies Fe2+ toxicity in rice (Oryza sativa L.) roots. Results indicated that rice cultivar Tianyou 998 (TY998) showed greater sensitivity to Fe2+ toxicity than rice cultivar Peizataifeng (PZTF). Treatment with 0.1 mmol L-1 Fe2+ inhibited TY998 root elongation and root biomass significantly. Reddish iron plaque was formed on root surface of both cultivars. TY998 had a higher amount of iron plaque than PZTF. Addition of Si to the solution of Fe treatment decreased the amount of iron plaque on root surface by 17.6% to 37.1% and iron uptake in rice roots by 37.0% to 40.3%, and subsequently restored root elongation triggered by Fe2+ toxicity by 13.5% in the TY998. Compared with Fe treatment, the addition of 1 mmol L-1 Si to the solution of Fe treatment increased xylem sap flow by 19.3% to 24.8% and root-shoot Fe transportation by 45.0% to 78.6%. Furthermore, Si addition to the solution of Fe treatment induced root cell wall to thicken. These results suggested that Si could detoxify Fe2+ toxicity and Si-mediated amelioration of Fe2+ toxicity in rice roots was associated with less iron plaque on root surface and more Fe transportation from roots to shoots.