Abstract
To improve the potential of cadmium phytoremediation, distant hybridization between tobacco (Nicotiana tabacum L. var. 78–04), a high-biomass crop, and Perilla frutescens var. frutescens, a wild Cd-hyperaccumulator, was carried out, developing a new variety N. tabacum L. var. ZSY. Seedlings at the six-leaf stage were grown in hydroponics and treated with 0 (control), 10 µM, 180 µM, and 360 µM CdCl2 for 7 days; then, the differences in Cd tolerance and accumulation and physiological and metabolic responses were evaluated among “ZSY” and its parents. At high Cd dose, the growth of “ZSY,” such as fresh weight, plant height, and root length, was evidently better than “78–04.” In contrast to P. frutescens and “78–04,” “ZSY” could accumulate more Cd in shoots than roots. Under the same treatment, “ZSY” accumulated greater amounts of Cd in both shoots (195–1523 mg kg−1) and roots (140–1281 mg kg−1) than “78–04” (shoots: 35–89 mg kg−1, roots: 39–252 mg kg−1), followed by P. frutescens (shoots: 156–454 mg kg−1, roots: 103–761 mg kg−1). BCF and TF values of “ZSY” reached 38–195 and 1.2–1.4, which were far higher than those of “78–04” (BCF: 2.2–35.3, TF: 0.35–0.9). Perilla frutescens was found with BCF and TF of 11–156 and 0.5–1.5. Cd stress obviously promoted the production of ROS and MDA in seedlings but reduced chlorophyll contents, especially in “78–04.” As a response to Cd stress, “ZSY” had higher SOD and CAT activities when compared to P. frutescens and “78–04,” while “78–04” produced more POD and proline than those of P. frutescens and “ZSY.” Cd stress could affect the production and accumulation of alkaloids and phenolic compounds in root (endodermis and cortex) and mesophyll. At high Cd doses, P. frutescens and “ZSY” had more alkaloids in tissues than “78–04.” Phenolic compounds in “78–04” were more obviously inhibited compared with P. frutescens and “ZSY.” These secondary metabolites may play an important role in eliminating oxidative damage and enhancing Cd tolerance and accumulation in “ZSY” and P. frutescens. Results indicated that distant hybridization could be one of effective methods for introducing excellent genes from metal-hyperaccumulators into high biomass species, creating plants with superior phytoremediation potential.
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This work was supported by the Shanxi Provincial Key Technologies Research and Development Program (201603D321002).
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All authors contributed to the study conception and design. Keqiang Wei: conceptualization, methodology, supervision, writing, and funding acquisition; Tingting Guo: methodology, experiments and data analysis.
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Highlights
• Hybrid tobacco displayed larger biomass, stronger tolerance, and higher accumulation than female parent.
• Introducing Perilla frutescens genes changed Cd distribution and accumulation in tobacco tissues.
• Introducing Perilla frutescens genes alleviated Cd-induced oxidative stress in tobacco.
• Introducing Perilla frutescens genes changed metabolic response of tobacco to Cd.
• Distant hybridization could create plant with superior phytoremediation potential.
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Wei, K., Guo, T. Enhancing the potential for cadmium phytoremediation by introducing Perilla frutescens genes in tobacco. Environ Sci Pollut Res 30, 70039–70053 (2023). https://doi.org/10.1007/s11356-023-27392-5
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DOI: https://doi.org/10.1007/s11356-023-27392-5