检索结果-南通市图书馆

Different effects of foliar application of silica sol on arsenic translocation in rice under low and high arsenite stress

引用

Journal of Environmental Sciences 2021年第7期33卷 22-32页

作者： Dandan Pan Chuanping Liu Jicai Yi Xiaomin Li Fangbai Li SCNU Environmental Research Institute Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety&MOE Key Laboratory of Theoretical Chemistry of EnvironmentSouth China Normal UniversityGuangzhou 510006China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642China School of Environment South China Normal UniversityGuangzhou 510006China College of Life Sciences South China Agricultural UniversityGuangzhou 510642China

Foliar application of Si can generally reduce As translocation from roots to shoots in rice;however, it does not always work, particularly under high As stress. Here, the effects of foliar application of nanoscale silica sol on As accumulation in rice were investigated under low(2 μmol/L) and high(8 μmol/L) arsenite stress. The results revealed that foliar Si application significantly decreased the As concentration in shoots under low arsenite stress, but showed different effects under high arsenite stress after 7 days of incubation. The reduction in root-to-shoot As translocation under the 2 As + Si treatment was related to the down-regulation of Os Lsi1 and Os Lsi2 expression and up-regulation of Os ABCC1 expression in roots. In the 8 As + Si treatment, the expressions of Os Lsi1, Os Lsi2, and Os ABCC1 were significantly promoted, which resulted in substantially higher As accumulation in both the roots and shoots. In the roots, As predominantly accumulated in the symplasts(90.6%–98.3%), in which the majority of As was sequestered in vacuoles(79.0%–94.0%) under both levels of arsenite stress. Compared with that of the 8 As treatment, the 8 As + Si treatment significantly increased the As concentration in cell walls, but showed no difference in the vacuolar As concentration, which remained constant at approximately 69.1–71.7 mg/kg during days 4–7. It appeared that the capacity of root cells to sequester As in the vacuoles had a threshold, and the excess As tended to accumulate in the cell walls and transfer to the shoots via apoplasts under high arsenite stress. This study provides a better understanding of the different effects of foliar Si application on As accumulation in rice from the view of arseniterelated gene expression and As subcellular distribution in roots.

关键词： Gene expression Apoplast symplast Vacuolar sequestration Cell wall

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Silicon reduces cadmium accumulation in Moso bamboo(Phyllostachys edulis)root cell sap by sequestering cadmium in hemicellulose 1

引用

Pedosphere 2024年第6期34卷 1002-1013页

作者： Yuzhen CHANG Fan YANG Chaofeng YANG Yiting ZHENG Xianyu PAN Shanshan MA Haibao JI Ji Feng SHAO State Key Laboratory of Subtropical Silviculture Zhejiang Agriculture and Forestry University Agricultural and Forestry Technology Promotion Center of Lin'an

Moso bamboo is one of the most important economic bamboo species in China, but cadmium（Cd） pollution has become a potential threat of its sustainable development. Silicon（Si） reduces Cd accumulation in many plant species. However, the exact mechanisms of this effect in Moso bamboo are still poorly understood. Here, we investigated the effect of Si on Cd accumulation in Moso bamboo in terms of Cd concentration in roots, Cd cellular and subcellular distribution, root cell morphology, and gene expression. Seedlings（ten days old） were exposed to different concentrations of Cd(0, 1, 5, and 50 μmol L-1) in a 0.5 mmol L-1CaCl2solution treated with（+Si） and without（-Si） 1 mmol L-1Si（as silicic acid） for two days. The effect of Si on the alleviation of Cd-induced inhibition of root elongation was not obvious, but Si could significantly reduce Cd accumulation in roots at all tested Cd concentrations(1, 5, and50 μmol L-1). Cadmium was localized in all cells of roots, but Si application altered the Cd distribution from all cells to distal side of exodermis cells in roots. Semi-quantitative determination of Cd using energy-dispersive X-rays revealed higher Cd concentrations in exodermis, but lower concentrations in the stele when Si was applied. However, Si increased Cd accumulation in root cell wall, but decreased it in cell sap. Moreover, more than 70% of Cd and Si were found in hemicellulose 1 of the cell wall. These results suggested that Si reduced Cd accumulation by sequestering Cd in hemicellulose 1 in the root cell wall at the subcellular level and retaining most of the Cd in the root exodermis at the cellular level in Moso bamboo under short-term Si application.

关键词： apoplast cell wall heavy metals pectin seedling symplast

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：