Heavy Metals Accumulation Effects on The Photosynthetic Performance of Geophytes in Mediterranean Reserve

Houri, Tarek; Khairallah, Yara; Zahab, Alaa Al; Osta, Bilal; Romanos, Dany; Haddad, Georges

doi:10.1016/j.jksus.2019.04.005

Cited by 73 publications

(44 citation statements)

References 17 publications

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“…The decrease in the total chlorophyll and carotenoid content was found in heavy metal exposed (Cd, Pb, Al, Cr) rare species Urginea maritima affecting the entire photosynthesis process [52]. They speculated that the decline in the chlorophyll levels occurred due to its degradation or reduced synthesis that mainly occurs through conversion of chlorophyll a into pheophytin a mediated by replacement of Mg by H-atoms [53,54].…”

Section: Discussionmentioning

confidence: 99%

Microbial Fortification Improved Photosynthetic Efficiency and Secondary Metabolism in Lycopersicon esculentum Plants Under Cd Stress

et al. 2019

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Environmental stress including heavy metal pollution is increasing at high speed and is polluting the cultivable land. Consequently, it results in affecting human population through entering into food chain. The current study aims that Cd stress (0.4 mM) led to toxicity and deleterious effects on 45-day-old Lycopersicon esculentum plants. The use of rhizobacterial strains underlines the main hypothesis of the present research that have been exploited in order to alleviate the Cd induced stress in plants and promoting their growth sidewise. The morphological parameters, plant pigments, and gaseous exchange parameters were estimated and found to be reduced in plants due to Cd toxicity. Along with this, the levels of phenolic compounds and osmoprotectants were stimulated in plants raised in Cd spiked soils. In addition, free amino acid content was reduced in plants under Cd treatment. It was revealed that these bacterial strains Pseudomonas aeruginosa (M1) and Burkholderia gladioli (M2) when inoculated to tomato plants improved the morphological characteristics and enhanced photosynthetic attributes. Moreover, the level of phenolic compounds and osmoprotectants were further enhanced by both the inoculating agents independently. However, in situ localization studies of phenol accumulation in root sections was found to be enhanced in Cd treated plants as revealed through higher intensity of yellowish-brown colour. The supplementation of bacterial strains further accumulated the phenols in Cd stressed root sections as evidenced through increased colour intensity. Therefore, the present study suggested that bacterial strains mitigates Cd stress from tomato plants through improving morphological, physiological and metabolite profiles. Consequently, the present research advocates the best utilization of rhizobacteria as stress alleviators for sustainable agriculture.

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Section: Discussionmentioning

confidence: 99%

Microbial Fortification Improved Photosynthetic Efficiency and Secondary Metabolism in Lycopersicon esculentum Plants Under Cd Stress

et al. 2019

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“…Chlorophyll content as an indicator of the photosynthetic system as well as plant robustness can offer responses on the soil quality [ 23 ]. Houri et al stated that the overload of heavy metals could lead to photosynthetic system damage, followed by chlorophyll pigments increase as an adaptation method [ 61 ]. After one month of exposure, the enrichment with metals influenced both the photosynthetic process measured by the total chlorophyll concentration ( Figure 9 ) and plant biomass quantified as leaves surface and weight ( Figure 8 ).…”

Section: Discussionmentioning

confidence: 99%

Toxic Metals (As, Cd, Ni, Pb) Impact in the Most Common Medicinal Plant (Mentha piperita)

Dinu

Gheorghe

Tenea

et al. 2021

IJERPH

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This study aimed to evaluate the behavior of Mentha piperita under Cd, Pb, Ni, and As soil contamination and their transfer from soil in plants as well as translocation in the roots/stems/leaves system compared with a control without metal addition. The mint seedlings were exposed for a three-month period using two metal mixtures in the same concentrations such as AsCd and AsCdNiPb (23.7 mg/kg As, 5 mg/kg Cd, 136 mg/kg Ni, and 95 mg/kg Pb). The results of metal concentration in plants showed that Cd, Ni, and Pb were accumulated in different parts of the plant, except for As. In plants organs, the order of metal accumulation was roots > stems > leaves. No significant impact on the growth, development, and chlorophyll content compared to the control was observed in the first month of exposure. After three months of exposure, phytotoxic effects occurred. Generally, the transfer coefficients and translocation factors values were less than 1, indicating that Mentha piperita immobilized the metals in root. The laboratory experiments highlighted that for a short period of time, Mentha piperita has the capacity to stabilize the metals at the root level and was a metal-tolerant plant when using a garden rich-substrate.

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“…Furthermore, metal stress affects the light phase of photosynthesis with negative impacts on the performance of the photosystems [ 36 ]. Recent reports on plant physiological activity under metal stress [ 36 , 37 , 38 , 39 , 40 ] highlight adverse effects on photosynthesis caused by high concentrations of metal. However, few detailed studies investigated hyperaccumulators ecophysiological response to metal stress [ 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Root and Shoot Response to Nickel in Hyperaccumulator and Non-Hyperaccumulator Species

Rosatto

Mariotti

Romeo

et al. 2021

Plants

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The soil–root interface is the micro-ecosystem where roots uptake metals. However, less than 10% of hyperaccumulators’ rhizosphere has been examined. The present study evaluated the root and shoot response to nickel in hyperaccumulator and non-hyperaccumulator species, through the analysis of root surface and biomass and the ecophysiological response of the related aboveground biomass. Ni-hyperaccumulators Alyssoides utriculata (L.) Medik. and Noccaea caerulescens (J. Presl and C. Presl) F.K. Mey. and non-hyperaccumulators Alyssum montanum L. and Thlaspi arvense L. were grown in pot on Ni-spiked soil (0–1000 mg Ni kg−1, total). Development of root surfaces was analysed with ImageJ; fresh and dry root biomass was determined. Photosynthetic efficiency was performed by analysing the fluorescence of chlorophyll a to estimate the plants’ physiological conditions at the end of the treatment. Hyperaccumulators did not show a Ni-dependent decrease in root surfaces and biomass (except Ni 1000 mg kg−1 for N. caerulescens). The non-hyperaccumulator A. montanum suffers metal stress which threatens plant development, while the excluder T. arvense exhibits a positive ecophysiological response to Ni. The analysis of the root system, as a component of the rhizosphere, help to clarify the response to soil nickel and plant development under metal stress for bioremediation purposes.

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Heavy Metals Accumulation Effects on The Photosynthetic Performance of Geophytes in Mediterranean Reserve

Cited by 73 publications

References 17 publications

Microbial Fortification Improved Photosynthetic Efficiency and Secondary Metabolism in Lycopersicon esculentum Plants Under Cd Stress

Microbial Fortification Improved Photosynthetic Efficiency and Secondary Metabolism in Lycopersicon esculentum Plants Under Cd Stress

Toxic Metals (As, Cd, Ni, Pb) Impact in the Most Common Medicinal Plant (Mentha piperita)

Root and Shoot Response to Nickel in Hyperaccumulator and Non-Hyperaccumulator Species

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