Complex intercellular interaction is a common theme in plant-pathogen/symbiont relationship. Cellular physiology of both the partners is affected by abiotic stress. However, little is known about the degree of protection each offers to the other from different types of environmental stress. Our current study focused on the changes in response to toxic arsenic in the presence of an endophytic fungus Piriformospora indica that colonizes the paddy roots. The primary impact of arsenic was observed in the form of hyper-colonization of fungus in the host root and resulted in the recovery of its overall biomass, root damage, and chlorophyll due to arsenic toxicity. Further, fungal colonization leads to balance the redox status of the cell by adjusting the antioxidative enzyme system which in turn protects photosynthetic machinery of the plant from arsenic stress. We observed that fungus has ability to immobilize soluble arsenic and interestingly, it was also observed that fungal colonization restricts most of arsenic in the colonized root while a small fraction of it translocated to shoot of colonized plants. Our study suggests that P. indica protects the paddy (Oryza sativa) from arsenic toxicity by three different mechanisms viz. reducing the availability of free arsenic in the plant environment, bio-transformation of the toxic arsenic salts into insoluble particulate matter and modulating the antioxidative system of the host cell.
Endophytic Fungi Piriformospora indica Mediated Protection of Host from Arsenic Toxicity
Shayan Mohd,J. Shukla,Aparna Singh Kushwaha,Kapil Mandrah,J. Shankar,Nidhi Arjaria,P. N. Saxena,R. Narayan,S. Roy,M. Kumar
Published 2017 in Frontiers in Microbiology
ABSTRACT
PUBLICATION RECORD
- Publication year
2017
- Venue
Frontiers in Microbiology
- Publication date
2017-05-10
- Fields of study
Biology, Medicine, Environmental Science
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- antioxidative enzyme system
The suite of host plant enzymes that manage oxidative stress, modulated by fungal colonization to balance cellular redox status under arsenic exposure.
Aliases: antioxidant enzyme system
- arsenic immobilization
The ability of P. indica to convert soluble arsenic into insoluble particulate matter, reducing the bioavailability of arsenic in the plant environment.
Aliases: arsenic bio-transformation
- arsenic toxicity
The toxic stress imposed on paddy plants by arsenic exposure, causing root damage, biomass reduction, and chlorophyll loss in this study.
Aliases: arsenic stress
- arsenic translocation
The movement of arsenic from colonized roots to the shoot, which is restricted by P. indica colonization in this study.
- hyper-colonization
The increased rate of fungal colonization in paddy roots observed as a primary response to arsenic stress in this study.
- oryza sativa
The paddy rice plant serving as the host organism in this study of fungal-mediated arsenic stress protection.
Aliases: paddy, rice
- photosynthetic machinery
The chloroplast-based photosynthesis apparatus of paddy, protected from arsenic-induced damage through fungal modulation of the antioxidative system.
Aliases: photosynthetic apparatus
- piriformospora indica
An endophytic fungus that colonizes paddy roots and is studied here for its role in mitigating arsenic stress in the host plant.
Aliases: P. indica
- redox status
The oxidative-reductive balance of the host plant cell, which is adjusted by fungal colonization to counteract arsenic-induced oxidative stress.
Aliases: cellular redox balance
REFERENCES
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