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ABSTRACT
Strigolactone can improve the tolerance of plants to abiotic stress. To improve the phytoremediation capacity of cadmium (Cd) hyperaccumulator Galinsoga parviflora Cav., the effects of strigolactone (using strigolactone analog GR24 with the concentration of 1 and 2 μmol/L) on the Cd accumulation of G. parviflora were studied. Cd treatment at 0.1 mg/L inhibited the growth of G. parviflora. Under Cd stress (0.1 mg/L), GR24 had no significant effect on the biomass and catalase activity of G. parviflora, while it decreased the peroxidase activity and increased the superoxide dismutase activity. In addition, GR24 decreased the root Cd content and root Cd extraction. GR24 at 1 μmol/L increased the shoot Cd content, shoot Cd extraction, bioconcentration factor, and translocation factor, while at 2 μmol/L, the opposite effect was observed. When the concentration of GR24 was 1 μmol/L, the shoot Cd content and shoot Cd extraction increased by 8.75% and 12.35%, respectively, compared with control. Moreover, correlation and grey relational analyses showed that the translocation factor, shoot Cd content, and plant height were the top three most highly correlated parameters with the shoot Cd extraction. These findings suggest that GR24 at 1 μmol/L can improve the phytoremediation capacity of G. parviflora for Cd.
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Notes on contributors
Yuanxiang Yang
Yuanxiang Yang is an associate professor in Sichuan Agricultural University.
Qinfeng Zheng
Qinfeng Zheng is a postgraduate student of Sichuan Agricultural University.
Kexuan Zhou
Kexuan Zhou is an undergraduate student of Sichuan Agricultural University.
Yunying Xiao
Yunying Xiao is a postgraduate student of Sichuan Agricultural University.
Chengyi Huang
Chengyi Huang is an associate professor in Sichuan Agricultural University.
Rongping Hu
Rongping Hu is a research fellow in Sichuan Academy of Agricultural Sciences.
Lijin Lin
Lijin Lin is a professor in Sichuan Agricultural University.
Jin Wang
Jin Wang is an associate professor in Sichuan Agricultural University.