Chitooligosaccharide application enhanced the growth and phytoremediation efficiency of industrial hemp in Cd-contaminated soils

Xinlin Zhao; Yuanchang Wang; Chenyuan Wang; Wei Zhou; Da Ouyang; Shuaishuai Gao; Xiaofei Tan; Rong Huang; Yuan Guo

doi:10.1016/j.biortech.2024.131998

Chitooligosaccharide application enhanced the growth and phytoremediation efficiency of industrial hemp in Cd-contaminated soils

Bioresour Technol. 2024 Dec 17:418:131998. doi: 10.1016/j.biortech.2024.131998. Online ahead of print.

Authors

Xinlin Zhao¹, Yuanchang Wang², Chenyuan Wang², Wei Zhou², Da Ouyang³, Shuaishuai Gao⁴, Xiaofei Tan⁵, Rong Huang², Yuan Guo⁶

Affiliations

¹ Institute of Bast Fiber Crops and Center for Southern Economic Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, Hunan, China; Hunan Provincial Key Laboratory of the TCM Agricultural Biogenomics, Changsha 410205, Hunan, China.
² Institute of Bast Fiber Crops and Center for Southern Economic Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, Hunan, China.
³ Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental & Resource Sciences, Zhejiang Agriculture and Forestry University, Hangzhou 311300, China.
⁴ Hunan Provincial Engineering and Technology Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Hunan Academy of Agricultural Sciences, Changsha, Changsha 410009, China.
⁵ College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, China; Shenzhen Research Institute of Hunan University, Shenzhen 518055, China.
⁶ School of Materials and Environmental Engineering, Changsha University, Changsha 41000, Hunan, China; Institute of Bast Fiber Crops and Center for Southern Economic Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, Hunan, China. Electronic address: guoyuan@caas.cn.

PMID: 39701391
DOI: 10.1016/j.biortech.2024.131998

Abstract

Hemp has been widely used for cadmium (Cd) remediation. However, its remediation efficiency needs to be improved. Chitooligosaccharides can enhance plant resistance and growth; however, their effects on hemp for Cd-remediation remain unclear. Herein, a greenhouse pot experiment was conducted to investigate the effects of three doses (0, 22.5, and 45 μg m^-2) of chitooligosaccharides (COS), chitin-oligosaccharides (NACOS), and hetero-chitooligosaccharides (HTCOS) on the growth and Cd-remediation efficiency of hemp. Results showed that chitooligosaccharides promoted the antioxidant system and aerial biomass (maximum 84 %) depending on doses and types. COS (22.5 μg m^-2 under 60 mg cadmium kg^-1 soil), NACOS, and HTCOS significantly elevated the Cd concentration in hemp. Consequently, NACOS and HTCOS (45 μg m^-2) significantly increased the average Cd removal up to 61 % and 81 %, respectively, compared with the control. Therefore, spraying chitooligosaccharides can enhance growth and phytoremediation efficiency of hemp by elevating aerial biomass and cadmium concentration of hemp.

Keywords: Antioxidant; Bioconcentration; Biomass; Cannabis sativa; Heavy metal; Phytomanagement.