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Author: search.filters.author.Tuteja, NarendraSubject: search.filters.subject.Antioxidants

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    Concurrent overexpression of rice G-protein β and γ subunits provide enhanced tolerance to sheath blight disease and abiotic stress in rice
    (Springer Nature Publishing AG, 2019) Swain, Durga Madhab; Sahoo, Ranjan Kumar; Chandan, Ravindra Kumar; Ghosh, Srayan; Kumar, Rahul; Jha, Gopaljee; Tuteja, Narendra
    The heterotrimeric G-proteins act as signalling molecules and modulate various cellular responses including stress tolerance in eukaryotes. The gamma (γ) subunit of rice G-protein (RGG1) was earlier reported to promote salinity stress tolerance in rice. In the present study, we report that a rice gene-encoding beta (β) subunit of G-protein (RGB1) gets upregulated during both biotic (upon a necrotrophic fungal pathogen, Rhizoctonia solani infection) and drought stresses. Markerfree transgenic IR64 rice lines that simultaneously overexpress both RGB1 and RGG1 genes under CaMV35S promoter were raised. The overexpressing (OE) lines showed enhanced tolerance to R. solani infection and salinity/drought stresses. Several defense marker genes including OsMPK3 were signifcantly upregulated in the R. solani-infected OE lines. We also found the antioxidant machineries to be upregulated during salinity as well as drought stress in the OE lines. Overall, the present study provides evidence that concurrent overexpression of G-protein subunits (RGG1 and RGB1) impart multiple (both biotic and abiotic) stress tolerance in rice which could be due to the enhanced expression of stress-marker genes and better management of reactive oxygen species (ROS)-scavenging/photosynthetic machinery. The current study suggests an improved approach for simultaneous improvement of biotic and abiotic stress tolerance in rice which remains a major challenge for its sustainable cultivation.
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    Piriformospora indica: a friend in need is a friend in deed
    (Research and Reviews, 2016) Trivedi, Dipesh Kumar; Srivastava, Amit; Verma, Praveen K.; Tuteja, Narendra; Gill, Sarvajeet Singh
    Piriformospora indica is an endophytic root-colonizing fungal species classified in the genus Piriformospora of the order Sebacinales. The chlamydospores of P. indica has a typical pear-shape and it was first discovered from the orchid plants in the Thar desert in Rajasthan, India and thus named P. indica.