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Abiotic stress tolerance in transgenic eggplant (Solanum melongena L.) by introduction of bacterial mannitol phosphodehydrogenase gene

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Abstract

In the present work, the bacterial mannitol-1-phosphodehydrogenase(mtlD) gene was introduced into eggplant(Solanummelongena L.) by Agrobacteriumtumefaciens-mediated transformation. Several transformants weregenerated and the transgene integration was confirmed by PCR, dot blot andSouthern blot analysis. Transgenic lines of T0 and T1generations were examined for tolerance to NaCl-induced salt stress,polyethylene glycol-mediated drought and chilling stress under bothinvitro and in vivo growth conditions. Aconsiderable proportions of transgenic seeds germinated and seedlings grew wellon 200 mM salt-amended MS basal medium, whereas seeds ofuntransformed control plants failed to germinate. Further, leaf explants fromthe transgenics could grow and showed signs of shoot regeneration onsalt-amended MS regeneration medium, whereas wild type did not respond, and infact the explants showed necrosis and loss of chlorophyll after about one week.The transgenic leaves could also withstand desiccation, and transgenics couldgrow well under chilling stress, and hydroponic conditions with salt stress ascompared to wild type plants. Thus, the transgenic lines were found to betolerant against osmotic stress induced by salt, drought and chilling stress.The morphology of the transgenic plants was normal as controls, but thechlorophyll content was higher in some of the lines. These observations suggestthat mtlD gene can impart abiotic stress tolerance ineggplant.

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Authors and Affiliations

  1. Plant Polyamine and Transgenic Research Laboratory, Department of Genetics, South Campus, University of Delhi, Benito Juarez Road, New Delhi, 110 021, India

    V. Prabhavathi & M.V. Rajam

  2. Danforth Plant Science Center, ILTAB, Saint Louis, 63121, USA

    J.S. Yadav

  3. Plant Biotechnology Centre, Indian Agricultural Research Institute, New Delhi, 110 012, India

    P.A. Kumar

Authors
  1. V. Prabhavathi
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  2. J.S. Yadav
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  3. P.A. Kumar
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  4. M.V. Rajam
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Correspondence to M.V. Rajam.

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Prabhavathi, V., Yadav, J., Kumar, P. et al. Abiotic stress tolerance in transgenic eggplant (Solanum melongena L.) by introduction of bacterial mannitol phosphodehydrogenase gene. Molecular Breeding 9, 137–147 (2002). https://doi.org/10.1023/A:1026765026493

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