Effect of arsenate on endogenous levels of cytokinins with different existing forms in two Pteris species

Li, Qinchun; Wang, Hongbin; Wang, Haijuan; Li, Yang; Wang, Zhongzhen; Zhang, Xuemei

doi:10.1016/j.plaphy.2018.10.009

Cited by 7 publications

(6 citation statements)

References 35 publications

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“…The accumulation of sAAs and tAAs is associated with the biosynthesis of other AAs [74]. As previously mentioned, increased bCK delays senescence, while C assimilation in As hyperaccumulators is augmented by increased photosynthesis [45,46]. bCKs restored photosynthesis by causing an increase in chlorophyll synthesis [1,2,60,[62][63][64][65][66][67] via the precursor 5-aminolevulonic acid synthesized from Glu [62].…”

Section: Plos Onementioning

confidence: 90%

“…An increase in bCK content induces the metabolism of stress antioxidants, delay of senescence and overcoming of stress via increased photosynthetic activity via a change in the unfavourable C/N ratio [2,[62][63][64][65][66][67]. Increased bCK delays senescence, and C assimilation in As hyperaccumulators is increased by the enhanced photosynthetic activity [45,46].…”

Section: Plos Onementioning

confidence: 99%

“…nervosa, but decreased in As-non-hyperaccumulator Pteris ensiformis in the presence of As(V) in the growth medium [45]. The content of many endogenous CKs in fronds of P. ensiformis was decreased by As and is likely to resist the phytotoxicity imposed by As [46]. Arsenate also caused severe depletion of endogenous CKs in the model plant Arabidopsis thaliana [47].…”

Section: Introductionmentioning

confidence: 97%

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Response of cytokinins and nitrogen metabolism in the fronds of Pteris sp. under arsenic stress

et al. 2020

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Given the close relationship between cytokinins (CKs), photosynthesis and nitrogen metabolism, this study assessed the effect of arsenic (As) contamination on these metabolic components in the As-hyperaccumulators Pteris cretica L. var. Albo-lineata (Pc-A) and var. Parkerii (Pc-P) as well as the As-non-hyperaccumulator Pteris straminea Mett. ex Baker (Ps). The ferns were cultivated in a pot experiment for 23 weeks in soil spiked with As at the levels 20 and 100 mg�kg-1. For the purpose of this study, the CKs were placed into five functionally different groups according to their structure and physiological roles: bioactive forms (bCKs; CK free bases); inactive or weakly active forms (dCKs; CK N-glucosides); transport forms (tCKs; CK ribosides); storage forms (sCKs; O-glucosides); and primary products of CK biosynthesis (ppbCKs; CK nucleotides). An important finding was higher CKs total content, accumulation of sCKs and reduction of dCKs in As-hyperaccumulators in contrast to non-hyperaccumulator ferns. A significant depletion of C resources was confirmed in ferns, especially Ps, which was determined by measuring the photosynthetic rate and chlorophyll fluorescence. A fluorescence decrease signified a reduction in the C/N ratio, inducing an increase of bioactive CKs forms in Pc-P and Ps. The impact of As on N utilization was significant in As-hyperaccumulators. The glutamic acid/glutamine ratio, an indicator of primary N assimilation, diminished in all ferns with increased As level in the soil. In conclusion, the results indicate a large phenotypic diversity of Pteris species to As and suggest that the CKs composition and the glutamic acid/glutamine ratio can be used as a tool to diagnose As stress in plants.

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Section: Plos Onementioning

confidence: 90%

Section: Plos Onementioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Response of cytokinins and nitrogen metabolism in the fronds of Pteris sp. under arsenic stress

et al. 2020

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“…Similar results were observed in the shoots of J. communis growing in the presence of different metals 18 , wheat seedlings 17 and D. cespitosa 19 treated with Cd, A. thaliana leaves exposed to ZnO nanoparticle 37 and hyperaccumulator Pteris cretica var. nervosa 16 subjected to As stress.…”

Section: Discussionmentioning

confidence: 99%

“…Treatment with phytohormones gives promising results for vascular plants 12,15,16 and algae 13,25 under abiotic stress. Exogenous auxins and cytokinins significantly alleviated Pb toxicity in A. obliquus cells by reducing oxidative stress through the activation of enzymatic and non-enzymatic antioxidant defense systems 4 .…”

mentioning

confidence: 99%

Auxins and Cytokinins Regulate Phytohormone Homeostasis and Thiol-Mediated Detoxification in the Green Alga Acutodesmus obliquus Exposed to Lead Stress

Piotrowska‐Niczyporuk

Bajguz

Kotowska

et al. 2020

Sci Rep

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Phytohormones, such as auxins and cytokinins, take part in the integration of growth control and stress response, but their role in algal adaptation to heavy metal remains to be elucidated. The current research indicated that lead (Pb), one of the most toxic metals in nature, causes severe depletion of endogenous cytokinins, auxins, and gibberellin and an increase in abscisic acid content in the green alga Acutodesmus obliquus. Exogenous auxins and cytokinins alleviate Pb toxicity through the regulation of the endogenous phytohormones' levels. Exogenously applied auxins provoked the coordinated activation metal tolerance mechanisms leading to the increase in phytochelatin synthase activity and accumulation of phytochelatins and their precursors, which are essential for Pb sequestration. On the other hand, phytochelatin synthesis decreased in algal cells treated with cytokinins. Significant changes in the levels of low molecular weight metabolites, mainly involved in metal chelation and glutathione synthesis pathway under the influence of phytohormones in algal cells growing in the presence of Pb stress, were observed. This is the first report showing that auxins and cytokinins are important regulatory factors in algal adaptation strategies to heavy metal stress based on thiol-mediated compounds and the maintenance of phytohormone homeostasis.

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Exploring the transporters and mechanisms of arsenic detoxification in plants and potential role of nanoparticles in alleviating arsenic stress

Khan,

Farhan,

Maqbool

et al. 2024

Plant Growth Regul

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Effect of arsenate on endogenous levels of cytokinins with different existing forms in two Pteris species

Cited by 7 publications

References 35 publications

Response of cytokinins and nitrogen metabolism in the fronds of Pteris sp. under arsenic stress

Response of cytokinins and nitrogen metabolism in the fronds of Pteris sp. under arsenic stress

Auxins and Cytokinins Regulate Phytohormone Homeostasis and Thiol-Mediated Detoxification in the Green Alga Acutodesmus obliquus Exposed to Lead Stress

Exploring the transporters and mechanisms of arsenic detoxification in plants and potential role of nanoparticles in alleviating arsenic stress

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