Synergistic application of silver nanoparticles and indole acetic acid alleviate cadmium induced stress and improve growth of Daucus carota L

Cadmium (Cd) is one of the major hazardous elements that is very toxic to the health of both human and plants. The toxicity of Cd causes plants to suffer by disabling their overall physiological mechanisms. Therefore, present study was intended to investigate the synergistic role of AgNPs and IAA in...

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Published in:Chemosphere (Oxford) 2022-03, Vol.290, p.133200-133200, Article 133200
Main Authors: Faiz, Samia, Shah, Anis Ali, Naveed, Naima Huma, Nijabat, Anila, Yasin, Nasim Ahmad, Batool, Aima Iram, Ali, Hayssam M., Javed, Talha, Simon, Phillip W., Ali, Aamir
Format: Article
Language:English
Subjects:
Antioxidant enzymes
Antioxidants
Cadmium
Cadmium - toxicity
Daucus carota
Daucus carota L
Humans
IAA
Indoleacetic Acids
Metal Nanoparticles - toxicity
Plant Roots
Silver - toxicity
Silver nanoparticles
Soil Pollutants - toxicity
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Summary:Cadmium (Cd) is one of the major hazardous elements that is very toxic to the health of both human and plants. The toxicity of Cd causes plants to suffer by disabling their overall physiological mechanisms. Therefore, present study was intended to investigate the synergistic role of AgNPs and IAA in improving the resilience against Cd toxicity and underlaying physiological and biochemical mechanisms in carrot (Daucus carota L.) plants. Also, the existence of genotypic variation for Cd tolerance in D. carota was also studied. The results revealed that Cd stress decreased plant growth attributes like root diameter, root length, root weight, shoot weight, shoot length, leaves fresh weight and leaves dry weight. Nonetheless, AgNPs and IAA mitigated Cd stress by detoxifying reactive oxygen species (ROS). Additionally, the application of AgNPs and IAA boosted plant growth through reducing the level of malondialdehyde (MDA). Enhancement in the activity of phenol synthesizing and oxidizing enzymes including peroxidase, polyphenol oxidase and phenylalanine ammonia-lyase was also observed by application of AgNPs and IAA. The increased activities of antioxidant enzymes including POX, PPO and PAL by the combined application of AgNPs and IAA advocate stress ameliorative role against Cd stress in plants. The enhanced Cd content was detected in the roots as compared to shoots of treated plants. Pre breed 22 was found as a Cd tolerant genotype. [Display omitted] •Cadmium (Cd) toxicity impaired growth performance of Daucus carota.•Exogenous AgNPs and IAA suppressed overproduction of ROS under cadmium stress.•Exogenous AgNPs and IAA improved root development under Cd toxicity conditions.•AgNPs and IAA synergistically regulated antioxidant system and phenolics biosynthesis in D. carota.•Pre breed 22 was the most Cd tolerant genotype.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2021.133200