Effect of Glomus mosseae on accumulation efficiency, hazard index and antioxidant defense mechanisms in tomato under metal(loid) Stress

Abstract

In the present study, the phytoremedation potential along with growth, physiological and biochemical response of tomato (Solanum lycopersicum) was assessed under heavy metal(loid) (HM) and arbuscular mycorrhizal fungus (AMF) amendment. Effect of AMF on uptake and accumulation of metal(loid)s was assessed and accumulation characteristics were expressed in terms of bioabsorption coefficient (BAC), bioconcentration factor (BCF), translocation factor (TLF) and transfer factor (TF). Results showed that AMF-inoculated plants showed not only a better growth, chlorophyll content, strengthened non-enzymatic and enzymatic defense mechanism, but also accumulated higher concentration of metal(loid)s. The correlation between biochemical and physiological parameters was significant at 0.01 level. A significant difference (p ≤ 0.001) in antioxidant enzyme activity was found on increasing metal(loid) dose and application of AMF. The accumulation of Cd and Pb in edible part exceeded the chronic reference dose stated by USEPA. The target hazard quotient (THQ) was >1 for Cd and Pb, whereas <1 for As. The study shows that tomato has good potential as Cd and Pb phytoremediator, hence must not be consumed when grown on Cd or Pb contaminated sites.

Growth, physiological, and biochemical responses of thyme (Thymus vulgaris L.) to the application of arbuscular mycorrhizal fungi under cadmium stress conditions

“…In the present study, results showed an increase in CAT and POD activities of thyme with Cd application. These results are in good agreement with those of Chaturvedi et al (2018) and Abdelhameed and Metwally (2019) that can be attributed to ROS's overproduction overexpression of genes coding for antioxidant enzymes. This result, which increases with increasing stress on the activity of antioxidant enzymes, indicates the effectiveness of the antioxidant system in plant protection and is compatible with the results obtained by Nas and Ali (2018) as a study the of effects of lead and Cd the growth and activity of some spinach enzymes.…”

Soil Mercury Pollution Changes Soil Arbuscular Mycorrhizal Fungal Community Composition

“…The use of Hg-enriching plants to extract Hg from Hg-contaminated soils (phytoextraction) [16,20] or the growth of Hg-tolerant plants in Hg-contaminated soils (phytostabiliza-tion) [21] are potential soil phytoremediation strategies. Some native soil microorganisms, such as arbuscular mycorrhizal fungi (AMF), can improve plant adaptability and growth status in this process, further improving the efficiency of the phytoremediation of heavy metal soils [22][23][24]. However, the lack of studies on the correlation between AMF community composition and soil Hg contamination has hindered the effective application of mycorrhizal technology in Hg-contaminated areas.…”