Salinity elevates Cd bioaccumulation of sea rice cultured under co-exposure of cadmium and salt

Xu Yang; Jiachun Li; Yuze Zheng; Huashou Li; Rongliang Qiu

doi:10.1016/j.jes.2022.05.053

Salinity elevates Cd bioaccumulation of sea rice cultured under co-exposure of cadmium and salt

J Environ Sci (China). 2023 Apr:126:602-611. doi: 10.1016/j.jes.2022.05.053. Epub 2022 Jun 10.

Authors

Xu Yang¹, Jiachun Li², Yuze Zheng², Huashou Li³, Rongliang Qiu⁴

Affiliations

¹ School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China; College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
² College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
³ College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China. Electronic address: lihuashou@scau.edu.cn.
⁴ School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China; College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China. Electronic address: eesqrl@mail.sysu.edu.cn.

PMID: 36503786
DOI: 10.1016/j.jes.2022.05.053

Abstract

Salt-tolerant rice (sea rice) is a key cultivar for increasing rice yields in salinity soil. The co-existence of salinity and cadmium (Cd) toxicities in the plant-soil system has become a great challenge for sustainable agriculture, especially in some estuaries and coastal areas. However, little information is available on the Cd accumulating features of sea rice under the co-stress of Cd and salinity. In this work, a hydroponic experiment with combined Cd (0, 0.2, 0.8 mg/L Cd²⁺) and saline (0, 0.6%, and 1.2% NaCl, W/V) levels and a pot experiment were set to evaluate the Cd toxic risks of sea rice. The hydroponic results showed that more Cd accumulated in sea rice than that in the reported high-Cd-accumulating rice, Chang Xianggu. It indicated an interesting synergistic effect between Cd and Na levels in sea rice, and the Cd level rose significantly with a concomitant increase in Na level in both shoot (r = 0.54, p < 0.01) and root (r = 0.66, p < 0.01) of sea rice. Lower MDA content was found in sea rice, implying that the salt addition probably triggered the defensive ability against oxidative stress. The pot experiment indicated that the coexistent Cd and salinity stress further inhibited the rice growth and rice yield, and the Cd concentration in rice grain was below 0.2 mg/kg. Collectively, this work provides a general understanding of the co-stress of Cd and salinity on the growth and Cd accumulation of sea rice. Additional work is required to precisely identify the phytoremediation potential of sea rice in Cd-polluted saline soil.

Keywords: Cadmium; Interaction; Salt; Sea rice.

MeSH terms

Cadmium* / toxicity
Hydroponics
Oryza*
Salinity
Soil

Substances

Cadmium
Soil