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Genetic transformation of peanut (Arachis hypogaea L.) using cotyledonary node as explant and a promoterlessgus::nptII fusion gene based vector

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Abstract

We have generated putative promoter tagged transgenic lines inArachis hypogaea cv JL-24 using cotyledonary node (CN) as an explant and a promoterless gus::nptII bifunctional fusion gene mediated byAgrobacterium transformation. MS medium fortified with 6-benzylaminopurine (BAP) at 4 mg/l in combination with 0.1 mg/l α-napthaleneacetic acid (NAA) was the most effective out of the various BAP and NAA combinations tested in multiple shoot bud formation. Parameters enhancing genetic transformation viz. seedling age,Agrobacterium genetic background and co-cultivation periods were studied by using the binary vector p35SGUSINT. Genetic transformation with CN explants from 6-day-old seedlings co-cultivated withAgrobacterium GV2260 strain for 3 days resulted in high kanamycin resistant shoot induction percentage (45%); approximately 31% transformation frequency was achieved with p35S GUSINT in Β-glucuronidase (GUS) assays. Among thein vivo GUS fusions studied with promoterless gus::nptII construct, GUS-positive sectors occupied 38% of the total transient GUS percentage. We have generated over 141 putative T0 plants by using the promoterless construct and transferred them to the field. Among these, 82 plants survived well in the green house and 5 plants corresponding to 3.54% showed stable integration of the fusion gene as evidenced by GUS, polymerase chain reaction (PCR) and Southern blot analyses. Twenty-four plants were positive for GUS showing either tissue-specific expression or blue spots in at least one plant part. The progeny of 15 T0 plants indicated Mendelian inheritance pattern of segregation for single-copy integration. The tissue-specific GUS expression patterns were more or less similar in both T0 and corresponding T1 progeny plants. We present the differential patterns of GUS expression identified in the putative promoter-tagged transgenic lines in the present communication.

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Abbreviations

AMV:

Alfalfa mosaic virus

BAP:

6-benzylaminophrine

CN:

cotyledonary node

GUS:

Β-glucuronidase

NAA:

α-naphthaleneacetic acid

PCR:

polymerase chain reaction

RIM:

root induction medium

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Authors and Affiliations

  1. Department of Plant Sciences, University of Hyderabad, 500 046, Hyderabad, India

    T. Swathi Anuradha, S. K. Jami & P. B. Kirti

  2. Plant Biotechnology Institute, S7N 0W9, Saskatoon, SK, Canada

    R. S. Datla

Authors
  1. T. Swathi Anuradha
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  2. S. K. Jami
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  3. R. S. Datla
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  4. P. B. Kirti
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Correspondence to P. B. Kirti.

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Anuradha, T.S., Jami, S.K., Datla, R.S. et al. Genetic transformation of peanut (Arachis hypogaea L.) using cotyledonary node as explant and a promoterlessgus::nptII fusion gene based vector. J Biosci 31, 235–246 (2006). https://doi.org/10.1007/BF02703916

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  • DOI: https://doi.org/10.1007/BF02703916

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