Comparisons of cadmium bioaccumulation potentials and resistance physiology of Microsorum pteropus and Echinodorus grisebachii

Yan, Yichao; Junjun, Wang; Lan, Xinyu; Wang, Qingmei; Xu, Fu-Liu

doi:10.1007/s11356-018-1486-4

Cited by 11 publications

(1 citation statement)

References 43 publications

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“…Though the MDA content under Cd stress after the fifth day was significantly lower than on the third day, tea plants were severely damaged at both stages. An increase in ROS content and a redox imbalance can lead to cell death, as reported in Echinodorus grisebachii and Microsorum pteropus (Yan et al 2018). Glutathione (GSH), as a ROS scavenger, plays a key role in plant survival under salt stress (Wingate et al 1988, Noctor andFoyer 1998).…”

Section: Discussionmentioning

confidence: 99%

The impact of cadmium stress on the ascorbate-glutathione pathway and ascorbate regeneration in tea plants

WANG¹,

LIU²,

CHEN³

et al. 2023

Biologia plant.

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Ascorbic acid (AsA) and glutathione (GSH) contribute to defense responses under abiotic stresses. The present study explored the ascorbate-glutathione cycle and ascorbate regeneration under high concentration (30 mM) of cadmium in the tea plant (Camellia sinensis L.). The tea leaves showed speckles and necrosis from the third day of Cd treatment. The content of superoxide anion (O2 .-) and hydrogen peroxide (H2O2) in the leaves were significantly higher until the seventh day after Cd treatment. The content of O2 .and H2O2 were the highest on the fifth day (212.7 and 153.6 % of the control, respectively). The AsA content increased (86.9 %) on the first day after Cd treatment and decreased significantly in the subsequent days, while GSH showed a reverse trend. The enzymatic activity assays showed that dehydroascorbate reductase (DHAR) and glutathione reductase (GR) involved in AsA regeneration were downregulated considerably after Cd foliar application. In contrast, the activities of ascorbate peroxidase (APX) and monodehydroascorbate reductase (MDHAR) increased on the first day and then declined. Reverse-transcription quantitative PCR showed upregulation of glutathione synthetase (CsGSHS), γ-glutamylcysteine synthetase (Csγ-ECS), and CsMDHAR of the AsA regeneration pathway and downregulation of CsDHAR and CsGR. The expressions of GDP-L-galactose phosphorylase (CsGGP), L-galactose-1-phosphate phosphatase (CsGPP), and L-galactono-1,4-lactone dehydrogenase (CsGaILDH) of the L-galactose pathway were also downregulated. The results indicated that AsA, which can respond to Cd stress of plants by increasing antioxidant ability, was consumed to scavenge ROS; moreover, Cd stress inhibited AsA synthesis and regeneration, which made that tea plants suffering severe damage.

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Section: Discussionmentioning

confidence: 99%