Hydrogen sulfide mediated alleviation of cadmium toxicity in Phlox paniculata L. and establishment of a comprehensive evaluation model for corresponding strategy

Autor:	Dan Huang, Hong Ao, Yan-Hui Che, Hong-Rui Wang
Rok vydání:	2020
Předmět:	0106 biological sciences Cadmium biology Hydrogen sulfide CADMIUM TOXICITY chemistry.chemical_element Plant Science 010501 environmental sciences equipment and supplies biology.organism_classification 01 natural sciences Pollution chemistry.chemical_compound chemistry Environmental chemistry Toxicity Environmental Chemistry Laboratory experiment Phlox paniculata 010606 plant biology & botany 0105 earth and related environmental sciences
Zdroj:	International Journal of Phytoremediation. 22:1085-1095
ISSN:	1549-7879 1522-6514
DOI:	10.1080/15226514.2020.1730299
Popis:	A laboratory experiment was performed to evaluate the potential role of H2S on cadmium (Cd) toxicity in Phlox paniculata L. Seeds pretreated with 0.3, 0.6, 0.9, and 1.2 mM NaHS as a donor of H2S for 24 h and subsequently exposed to 100, 200, and 300 μM CdCl2 for 26 days had significantly higher germination rate compared with Cd alone. Meanwhile, 2-year-old seedlings sprayed with 0.3, 0.6, and 0.9 μM NaHS were grown in soil with 0.3, 0.6, and 1.2 mg/kg CdCl2, respectively. We observed that H2S decreased Cd accumulation in leaves and elevated Cd concentration in roots. Cd toxicity in seedlings resulted in a substantial increase in Cd-induced overproduction of malondialdehyde (MDA), Cd accumulation, and electrolyte leakage. Meanwhile, addition of NaHS increased photosynthetic performance compared with Cd alone. Exogenous H2S significantly elevated biomass, improved antioxidant enzyme activities, and reduced ABA content compared with Cd alone. H2S also plays an important role in the ABA signaling pathway during stress. Notably, NaHS promoted Cd uptake by Phlox paniculate L. from soil. The prediction model of H2S for increasing plant resistance and reducing soil Cd pollution was established by factor analysis method based on comprehensive evaluation of plant stress physiology.
Databáze:	OpenAIRE
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