Hormesis Effects Induced by Cadmium on Growth and Photosynthetic Performance in a Hyperaccumulator, Lonicera japonica Thunb.

Jia, Liguo; Liu, Zhouli; Chen, Wei; Ye, Yin; Yu, Shuai; He, Xingyuan

doi:10.1007/s00344-014-9433-1

Cited by 100 publications

(42 citation statements)

References 43 publications

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“…This result linked to ΦPSII clearly reveals a higher efficiency of the reaction centres aiming the capture of excited light energy (Yu et al 2004). The increases in qP and ETR promoted by the EBR reveals the positive interference on the activation of the PSII reaction centres, inducing the oxidation of QA, the primary quinone molecule responsible for receiving and transferring electrons between PSII and PSI (Maxwell and Johnson 2000, Singh and Prasad 2014, Jia et al 2015. Li et al (2015) found benefits for PSII after EBR application in seedlings of Capsicum annuum subjected to oxidative stress by low temperature, in which plants exposed to low temperature + 0.l μM EBR exhibited significant increases of 13.2 and 5.6% in ΦPSII and qP, respectively, compared to the treatment under low temperature without EBR.…”

Section: Discussionmentioning

confidence: 93%

Brassinosteroids increase electron transport and photosynthesis in soybean plants under water deficit

Pereira¹,

Rodrigues²,

Lima³

et al. 2019

Photosynt.

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Drought frequently results in significant losses in agricultural systems, including the soybean yield. Brassinosteroids exhibit multiple actions on essential processes, including chlorophyll fluorescence and gas exchange. Considering that the electron transport rate (ETR) into photosystems can exercise interference on net photosynthetic rate (PN), this research aims to determine whether 24-epibrassinolide (EBR) affects electron transport and find out if there is any repercussion on photosynthesis in soybean plants affected by the water deficit. The experiment was performed using a randomized factorial design, with two water conditions (control and water deficit) and three EBR concentrations (0, 50, and 100 nM EBR). The water deficit reduced effective quantum yield of PSII photochemistry, ETR, PN, and water-use efficiency. However, the exogenous application of 100 nM EBR mitigated these negative effects, increasing these variables. EBR reduced the oxidant compounds (superoxide and hydrogen peroxide) and membrane damages (malondialdehyde and electrolyte leakage) in stressed plants. Our study proved that EBR increased ETR and PN in control and stressed plants, revealing that ETR had a strong relationship with PN. These results suggest that soybean plants with higher values of ETR are more efficient in relation to PN.Additional key words: chlorophyll fluorescence; drought; gas exchange; Glycine max; 24-epibrassinolide. transport rate; ETR/PN -ratio between the apparent electron-transport rate and net photosynthetic rate; EXC -relative energy excess at the PSII level; F0 -minimal fluorescence yield of the dark-adapted state; Fm -maximal fluorescence yield of the dark-adapted state; Fv -variable fluorescence; Fv/Fm -maximal quantum yield of PSII photochemistry; gs -stomatal conductance to water vapor; LDM -leaf dry matter; MDA -malondialdehyde; NPQ -nonphotochemical quenching; PEG -polyethylene glycol; PN -net photosynthetic rate; PN/Ci -instantaneous carboxylation efficiency; qP -photochemical quenching; RDM -root dry matter; ROS -reactive oxygen species; STM -stem dry matter; TDM -total dry matter; WUE -water-use efficiency; ΦPSII -effective quantum yield of PSII photochemistry. Acknowledgements: This research had financial support from Fundação Amazônia de Amparo a Estudos e Pesquisas (FAPESPA/Brazil), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq/Brazil) and Universidade Federal Rural da Amazônia (UFRA/ Brazil) to AKS Lobato. While YC Pereira and WS Rodrigues were supported with scholarships from Programa de Educação Tutorial (PET/Brazil).

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Section: Discussionmentioning

confidence: 93%

Brassinosteroids increase electron transport and photosynthesis in soybean plants under water deficit

Pereira¹,

Rodrigues²,

Lima³

et al. 2019

Photosynt.

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“…However, hormesis has been gaining more and more interest in recent years [2][3][4]41]. The stimulatory effect of low concentrations of Cd on plant growth was reported for Lonicera japonica by Jia et al [8,42] and for Brassica juncea by Seth et al [43]. Moreover, it was reported that Pb also had a stimulatory effect on the growth of corn [44] and Arabis paniculata [45].…”

Section: Discussionmentioning

confidence: 99%

Hormesis in Plants: The Role of Oxidative Stress, Auxins and Photosynthesis in Corn Treated with Cd or Pb

Małkowski

Sitko

Szopiński

et al. 2020

IJMS

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Hormesis, which describes the stimulatory effect of low doses of toxic substances on growth, is a well-known phenomenon in the plant and animal kingdoms. However, the mechanisms that are involved in this phenomenon are still poorly understood. We performed preliminary studies on corn coleoptile sections, which showed a positive correlation between the stimulation of growth by Cd or Pb and an increase in the auxin and H 2 O 2 content in the coleoptile sections. Subsequently, we grew corn seedlings in hydroponic culture and tested a wide range of Cd or Pb concentrations in order to determine hormetic growth stimulation. In these seedlings the gas exchange and the chlorophyll a fluorescence, as well as the content of chlorophyll, flavonol, auxin and hydrogen peroxide, were measured. We found that during the hormetic stimulation of growth, the response of the photosynthetic apparatus to Cd and Pb differed significantly. While the application of Cd mostly caused a decrease in various photosynthetic parameters, the application of Pb stimulated some of them. Nevertheless, we discovered that the common features of the hormetic stimulation of shoot growth by heavy metals are an increase in the auxin and flavonol content and the maintenance of hydrogen peroxide at the same level as the control plants.

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“…Although the palisade parenchyma was reduced by Cd on the adaxial leaf side, the absence of significant changes on the abaxial side may have balanced the photosynthetic capacity. In tolerant species Cd has no effect or may increase the leaf and chlorenchyma thickness (Luković et al, 2012;Jia et al, 2015;Pereira et al, 2016). It is known that T. domingensis photosynthetic activity is related to palisade parenchyma thickness (Santos et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…The lower growth capacity under Cd contamination is related to lower photosynthesis (Pietrini et al, 2003). However, in tolerant species such as Lonicera japonica (Jia et al, 2015), Schinus molle and Eichhornnia crassipes (Pereira et al, 2017) increased photosynthesis and growth can be found in response to Cd stress.…”

Section: Introductionmentioning

confidence: 99%

Cadmium tolerance of Typha domingensis Pers. (Typhaceae) as related to growth and leaf morphophysiology

et al. 2017

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Typha domingensis (cattail) is a native macrophyte known by its capacity to tolerate several heavy metals effects and the potential use for phytoremediation. However, in despite that cadmium (Cd) is one of the most toxic pollutants; its effects in T. domingensis biology remain uninvestigated. Thus, the objective of this study was to study the tolerance of T. domingensis to cadmium contamination by evaluating its growth, Cd uptake, leaf anatomy and gas exchange. The experiment was designed using three cadmium concentrations (0, 10 and 50 µM) and ten replicates for 90 days. The cadmium uptake, growth, gas exchange, chlorophyll content and leaf anatomy were evaluated. Data was submitted to ANOVA and Scott-Knott test for P<0.05. Typha domingensis accumulates Cd proportionally to its concentration on the solution and the content of this metal was higher in roots as compared to shoots. Plants showed no significant modifications on growth parameters such as the biomass production, number of leaves, number of clones and the biomass allocation to organs. The photosynthesis, transpiration and chlorophyll content were not modified by Cd. Most anatomical traits evaluated were not modified by the metal but the stomatal density and the proportion of vascular tissues were reduced under 50 µM of Cd. In despite, the leaf anatomy showed no toxicity evidences for any Cd level. The absence of growth reduction and the stability of anatomical and physiological traits give insight about the Cd tolerance of this species. Therefore, T. domingensis is able to overcome Cd toxicity and shows potential for phytoremediation. Keywords

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Hormesis Effects Induced by Cadmium on Growth and Photosynthetic Performance in a Hyperaccumulator, Lonicera japonica Thunb.

Cited by 100 publications

References 43 publications

Brassinosteroids increase electron transport and photosynthesis in soybean plants under water deficit

Brassinosteroids increase electron transport and photosynthesis in soybean plants under water deficit

Hormesis in Plants: The Role of Oxidative Stress, Auxins and Photosynthesis in Corn Treated with Cd or Pb

Cadmium tolerance of Typha domingensis Pers. (Typhaceae) as related to growth and leaf morphophysiology

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