Foliar-applied zinc promotes cadmium allocation from leaf surfaces to grains in rice

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Sciences-china Pub Date : 2024-04-27 DOI:10.1016/j.jes.2024.04.033
Ya-Ting Liu , Bo-Fang Yan , Xuan Cai , Hong-Xiang Zheng , Rong-Liang Qiu , Ye-Tao Tang
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Abstract

The accumulation of Cd by rice poses significant health risks. Foliar fertilization with Zn can reduce grain Cd contents in rice grown in Cd-contaminated soils. However, atmospheric deposition on leaves is another vector of Cd contamination, and it remains unclear how Zn application affects the allocation of such Cd. We conducted an experiment where the flag leaves of rice plants were treated with solutions with various Zn concentrations and a constant Cd concentration. The 111Cd stable isotope was used to trace the flux of foliar-applied Cd. Higher levels of foliar-applied Zn enhanced Cd efflux and grain allocation. This is attributed to limited sequestration of foliar-applied Cd in the leaf cell symplasm and increased Cd desorption from leaf cell walls when a high Zn2+ concentration occurs in the apoplast. Nonionic Zn oxide nanoparticles mitigated these effects. Additionally, the expressions of OsLCT1 and OsZIP7 in flag leaves and OsHMA2 and OsZIP7 in the uppermost nodes were upregulated under high-Zn2+ treatment, which may facilitate Cd phloem loading and grain allocation. Caution is advised in using foliar Zn in areas with high atmospheric Cd due to potential grain-contamination risks.

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叶面喷施锌可促进镉从水稻叶面向谷粒的分配
水稻中镉的积累对健康构成重大威胁。在镉污染土壤中种植的水稻,叶面施肥锌可以降低谷粒中的镉含量。然而,叶片上的大气沉积物是镉污染的另一个载体,目前还不清楚施锌如何影响这些镉的分配。我们进行了一项实验,用不同锌浓度和恒定镉浓度的溶液处理水稻植株的旗叶。111Cd 稳定同位素被用来追踪叶面施肥镉的通量。叶面施用锌的水平越高,镉的外流和谷粒的分配就越多。这归因于叶面施肥的镉在叶细胞质中的螯合作用有限,以及当细胞质中 Zn2+ 浓度较高时,叶细胞壁对镉的解吸作用增强。非离子氧化锌纳米颗粒减轻了这些影响。此外,在高Zn2+处理下,旗叶中OsLCT1和OsZIP7以及最上层节中OsHMA2和OsZIP7的表达上调,这可能会促进镉的韧皮部负载和谷粒分配。由于潜在的谷物污染风险,建议在大气镉含量高的地区谨慎使用叶面锌。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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