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An Overview of Morpho-Physiological, Biochemical, and Molecular Responses of Sorghum Towards Heavy Metal Stress

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Reviews of Environmental Contamination and Toxicology Volume 256

Abstract

Heavy metal (HM) contamination is a serious global environmental crisis. Over the past decade, industrial effluents, modern agricultural practices, and other anthropogenic activities have significantly depleted the soil environment. In plants, metal toxicity leads to compromised growth, development, productivity, and yield. Also, HMs negatively affect human health due to food chain contamination. Thus, it is imperative to reduce metal accumulation and toxicity. In nature, certain plant species exhibit an inherent capacity of amassing large amounts of HMs with remarkable tolerance. These plants with unique characteristics can be employed for the remediation of contaminated soil and water. Among different plant species, Sorghum bicolor has the potential of accumulating huge amounts of HMs, thus could be regarded as a hyperaccumulator. This means that it is a metal tolerant, high biomass producing energy crop, and thus can be utilized for phytoremediation. However, high concentrations of HMs hamper plant height, root hair density, shoot biomass, number of leaves, chlorophyll, carotenoid, and carbohydrate content. Thus, understanding the response of Sorghum towards different HMs holds considerable importance. Considering this, we have uncovered the basic information about the metal uptake, translocation, and accumulation in Sorghum. Plants respond to different HMs via sensing, signaling, and modulations in physico-chemical processes. Therefore, in this review, a glimpse of HM toxicity and the response of Sorghum at the morphological, physiological, biochemical, and molecular levels has been provided. The review highlights the future research needs and emphasizes the extensive molecular dissection of Sorghum to explore its genetic adaptability towards different abiotic stresses that can be exploited to develop resilient crop varieties.

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Abbreviations

ACP:

Acid phosphatase

APX:

Ascorbate peroxidase

CAT:

Catalase

CAX:

Cation exchanger

CDF:

Cation diffusion facilitator

CTR:

Copper transporter

DHA:

Dehydroascorbic acid

DHAR:

Dehydroascorbate reductase

GR:

Glutathione reductase

GSH:

Glutathione

GSSG:

Glutathione disulfide

HM:

Heavy metal

MDA:

Malondialdehyde

MDHAR:

Mono-dehydroascorbate reductase

POX:

Peroxidase

QTL:

Quantitative trait locus

ROS:

Reactive oxygen species

SOD:

Superoxide dismutase

ZIP:

Zinc-iron permease

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Acknowledgments

SK thankfully acknowledges the Science and Engineering Research Board (SERB), New Delhi, India for the Research Scientist Scheme. DM and BNM acknowledge the Institute of Engineering and Technology, APJ Abdul Kalam Technical University, India for the infrastructure and facilities.

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Correspondence to Smita Kumar .

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Mishra, D., Kumar, S., Mishra, B.N. (2020). An Overview of Morpho-Physiological, Biochemical, and Molecular Responses of Sorghum Towards Heavy Metal Stress. In: de Voogt, P. (eds) Reviews of Environmental Contamination and Toxicology Volume 256. Reviews of Environmental Contamination and Toxicology, vol 256. Springer, Cham. https://doi.org/10.1007/398_2020_61

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