title: Simultaneous Expression ofPDH45withEPSPSGene Improves Salinity and Herbicide Tolerance in Transgenic Tobacco Plants.
abstract: To cope with the problem of salinity- and weed-induced crop losses, a multi-stress tolerant trait is need of the hour but a combinatorial view of such traits is not yet explored. The overexpression ofPDH45(pea DNA helicase 45) andEPSPS(5-enoylpruvyl shikimate-3-phosphate synthase) genes have been reported to impart salinity and herbicide tolerance. Further, the understanding of mechanism and pathways utilized by PDH45 and EPSPS for salinity and herbicide tolerance will help to improve the crops of economical importance. In the present study, we have performed a comparative analysis of salinity and herbicide tolerance to check the biochemical parameters and antioxidant status of tobacco transgenic plants. Collectively, the results showed thatPDH45overexpressing transgenic lines display efficient tolerance to salinity stress, whilePDH45+EPSPStransgenics showed tolerance to both the salinity and herbicide as compared to the control [wild type (WT) and vector control (VC)] plants. The activities of the components of enzymatic antioxidant machinery were observed to be higher in the transgenic plants indicating the presence of an efficient antioxidant defense system which helps to cope with the stress-induced oxidative-damages. Photosynthetic parameters also showed significant increase inPDH45andPDH45+EPSPSoverexpressing transgenic plants in comparison to WT, VC andEPSPStransgenic plants under salinity stress. Furthermore,PDH45andPDH45+EPSPSsynergistically modulate the jasmonic acid and salicylic acid mediated signaling pathways for combating salinity stress. The findings of our study suggest that pyramiding of thePDH45gene withEPSPSgene renders host plants tolerant to salinity and herbicide by enhancing the antioxidant machinery thus photosynthesis.
authors.affiliation: International Centre for Genetic Engineering and Biotechnology New Delhi, India.
authors.forename: Bharti
authors.initials: B
authors.lastname: Garg
authors.affiliation: Stress Physiology and Molecular Biology Lab, Centre for Biotechnology, Maharshi Dayanand University Rohtak, India.
authors.forename: Sarvajeet S
authors.initials: SS
authors.lastname: Gill
authors.affiliation: International Centre for Genetic Engineering and Biotechnology New Delhi, India.
authors.forename: Dipul K
authors.initials: DK
authors.lastname: Biswas
authors.affiliation: International Centre for Genetic Engineering and Biotechnology New Delhi, India.
authors.forename: Ranjan K
authors.initials: RK
authors.lastname: Sahoo
authors.affiliation: Bejo Sheetal Seeds Pvt. Ltd Jalna, India.
authors.forename: Nandkumar S
authors.initials: NS
authors.lastname: Kunchge
authors.affiliation: International Centre for Genetic Engineering and Biotechnology New Delhi, India.
authors.forename: Renu
authors.initials: R
authors.lastname: Tuteja
authors.affiliation: International Centre for Genetic Engineering and BiotechnologyNew Delhi, India; Amity Institute of Microbial Technology, Amity University Uttar PradeshNoida, India.
authors.forename: Narendra
authors.initials: N
authors.lastname: Tuteja
keywords: EPSPS; PDH45; herbicide tolerance; salinity; tobacco