Effects of CO2 application coupled with endophyte inoculation on rhizosphere characteristics and cadmium uptake by Sedum alfredii Hance in response to cadmium stress

Lin Tang; Yasir Hamid; Zulfiqar Ali Sahito; Hanumanth Kumar Gurajala; Zhenli He; Xiaoe Yang

doi:10.1016/j.jenvman.2019.03.084

Effects of CO₂ application coupled with endophyte inoculation on rhizosphere characteristics and cadmium uptake by Sedum alfredii Hance in response to cadmium stress

J Environ Manage. 2019 Jun 1:239:287-298. doi: 10.1016/j.jenvman.2019.03.084. Epub 2019 Mar 23.

Authors

Lin Tang¹, Yasir Hamid¹, Zulfiqar Ali Sahito¹, Hanumanth Kumar Gurajala¹, Zhenli He², Xiaoe Yang³

Affiliations

¹ Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China.
² University of Florida, Institute of Food and Agricultural Sciences, Indian River Research and Education Center, Fort Pierce, Florida, 34945, United States.
³ Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, People's Republic of China. Electronic address: xeyang@zju.edu.cn.

PMID: 30913479
DOI: 10.1016/j.jenvman.2019.03.084

Abstract

Comparative impact of CO₂ application and endophyte inoculation was investigated on the growth, rhizosphere characteristics, and cadmium (Cd) absorption of two ecotypes of Sedum alfredii Hance in response to Cd stress under hydroponic or rhizo-box culture conditions. The results showed that both CO₂ application and endophyte inoculation significantly (P < 0.05) promoted plant growth (fresh weight and dry weight), improved root morphological properties (SRL, SRA, SRV, ARD and RTN) and exudation (pH, TOC, TN, soluble sugar and organic acids), changed Cd uptake and distribution of both ecotypes of S. alfredii. Meanwhile soil total and DTPA extractable Cd in rhizo-box decreased by biofortification treatments. Superposition biofortification exhibits utmost improvement for the above mentioned parameters, and has potential for enhancing phytoremediation efficiency of hyperaccumulator and sustaining regular growth of non-hyperaccumulator in Cd contaminated soils.

Keywords: Biofortification; Heavy metal; Hyperaccumulator; Root exudation; Root morphological properties.

MeSH terms

Cadmium / pharmacology*
Carbon Dioxide / metabolism*
Endophytes / drug effects
Endophytes / metabolism*
Hydroponics
Plant Roots / chemistry
Rhizosphere*
Sedum / chemistry
Sedum / drug effects
Sedum / metabolism*
Soil / chemistry

Substances

Soil
Cadmium
Carbon Dioxide