Journal
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
Volume 169, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2019.103897
Keywords
Cd stress; Nitrogen form; Sphytoremediation; Cd sequestration; Populus clones
Categories
Funding
- Zhejiang Provincial Natural Science Foundation of China [LQ18C030004]
- Natural Science Foundation of China [31800507]
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Although nitrogen (N) influences plant response to cadmium (Cd) stress, little information has been suggested on how N forms affect Cd distribution and tolerance in Populus clones with different sensitivities to N deficiency. In this study, we examined physiological, chemical and microstructural traits involving in Cd accumulation, distribution and tolerance under different N forms (NH4+-N and NO3--N). We found that N limitation-insensitive clone Nanlin 1388 had stronger Cd tolerance than N limitation-sensitive clone Nanlin 895 under both N forms, which is associated with Cd elaborate arrangement in tissues and/or cellular compartments, as well as an enhanced antioxidation capacity. NH4+ supply significantly promoted Cd uptake and accumulation in leaves, especially in Nanlin 895, when compared to NO3- supply. Furthermore, NO3- and NH4+ differently regulated Cd distribution in leaves and roots of Nanlin 1388 and Nanlin 895. NO3- supply promoted Cd distribution in leaf epidermis, especially in the upper epidermis of leaf blades and veins in Nanlin 1388. In contrast, NH4+ induced more Cd distribution in the leaf lower epidermis and vascular tissues for Nanlin 895. These results collectively suggested that Nanlin1388 had stronger Cd tolerance, especially under NO3- supply, which provided new insights to engineer woody plants for phytoremediation.
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