New Evidence of Semi-Mangrove Plant Barringtonia racemosa in Soil Clean-Up: Tolerance and Absorption of Lead and Cadmium

Fang Liang, Ju Hu, Bing Liu, Lin Li, Xiuling Yang, Caihong Bai () and Xiaohui Tan ()
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Fang Liang: College of Biology and Pharmacy, Yulin Normal University, Yulin 537000, China
Ju Hu: College of Biology and Pharmacy, Yulin Normal University, Yulin 537000, China
Bing Liu: Forestry of College, Guangxi University, Nanning 530001, China
Lin Li: College of Biology and Pharmacy, Yulin Normal University, Yulin 537000, China
Xiuling Yang: College of Biology and Pharmacy, Yulin Normal University, Yulin 537000, China
Caihong Bai: College of Biology and Pharmacy, Yulin Normal University, Yulin 537000, China
Xiaohui Tan: Guangxi Subtropical Crops Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530001, China

IJERPH, 2022, vol. 19, issue 19, 1-14

Abstract: Mangrove plants play an important role in the remediation of heavy-metal-contaminated estuarine and coastal areas; Barringtonia racemosa is a typical semi-mangrove plant. However, the effect of heavy metal stress on this plant has not been explored. In this study, tolerance characteristics and the accumulation profile of cadmium (Cd) and lead (Pb) in B. racemosa were evaluated. The results indicated that B. racemosa exhibited a high tolerance in single Cd/Pb and Cd + Pb stress, with a significant increase in biomass yield in all treatment groups, a significant increase in plant height, leaf area, chlorophyll and carotenoid content in most treatment groups and without significant reduction of SOD, POD, MDA, proline content, Chl a, Chl b, Chl a + b, Car, ratio of Chl a:b and ratio of Car:Chl (a + b). Cd and Pb mainly accumulated in the root (≥93.43%) and the content of Cd and Pb in B. racemosa was root > stem > leaf. Pb showed antagonistic effects on the Cd accumulation in the roots and Cd showed antagonistic or synergistic effects on the Pb accumulation in the roots, which depended on the concentration of Cd and Pb. There was a significant synergistic effect of Cd and Pb enrichment under a low Cd and Pb concentration treatment. Thus, phytoremediation could potentially use B. racemosa for Cd and Pb.

Keywords: Barringtonia racemosa; cadmium and lead stress; tolerance; absorption (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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