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Optimization of Agrobacterium-mediated genetic transformation of shoot tip explants of green gram (Vigna radiata (L.) Wilczek)

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Abstract

Shoot tip explants prepared from seedlings of ML-267 genotype of green gram were inoculated on MSB5 medium supplemented with BAP (0–20 μM) individually or in combination with minimal concentration of auxins (NAA/IAA/IBA) for adventitious shoots formation. BAP alone without auxins was observed to be efficient in multiple shoot induction and optimum shoot proliferation was achieved on MSB5 medium containing 10 μM BAP with 100 % shoot induction frequency. 3-day-old explants gave best shoot multiplication response and the mean shoot number decreased significantly in 4-day and 5-day-old explants. The induced shoots rooted profusely on ½ MSB5 + 2.46 µM IBA and about 90 % of the plantlets survived after acclimatization and set seed normally. Shoot tip explants infected with A.tumefaciens (LBA4404) harboring pCAMBIA 2301 + AnnBj1 recombinant vector. Various factors which influence the competence of transformation were optimized based on the frequency of transient GUS expression in shoot tip explants. Optimum levels of transient GUS expression were recorded at pre-culture of explants for 2 days, infection for 10 min with Agro-culture of 0.8 OD and co-cultivation for 3 days on co-cultivation medium containing 100 µM acetosyringone in dark at 23 °C. Putative transformed shoots were produced on selection medium (shoot inductionmedium with100 mg/l kanamycin and 250 mg/l cefotaxim). PCR analysis confirmed the presence of AnnBj1, nptII, and uidA genes in T0 plants. Stable GUS activity was detected in flowers of T0 plants and leaves of T1 plants. PCR analysis of T1 progeny revealed AnnBj1 gene segregated following a Mendelian segregation pattern.

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Abbreviations

BAP:

6-Benzyleaminopurine

Cefo:

Cefotaxim

GUS:

β-Glucuronidase

IAA:

Indole-3-acetic acid

IBA:

Indole-3-buteric acid

Kan:

Kanamycin

MSB5:

MS basal salts with gamborg vitamines

NAA:

1-Naphthaleneacetic acid

OD:

Optical density

SBIM:

Shoot bud induction medium

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Acknowledgments

Author GKM is greatly thankful to Agri Biotech Foundation for providing facilities to conduct part of these studies.

Authors contributions

GKM contributed to the acquisition of data by conducting different experiments and manuscript preparation. VNJ has made substantial contribution in critically drafting and editing the manuscript. GM contributed by giving valuable suggestions in preparation of manuscript. PBK has helped in initial concept design and generously provided the AnnBj1 gene construct. SKY conceived the study and contributed to designing experiments, data analysis and critical revision of manuscript.

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Authors and Affiliations

  1. Division of Crop Sciences, ICAR-Central Research Institute for Dryland Agriculture, Santoshnagar, Hyderabad, 500 059, India

    Gopala Krishna Mekala & S. K. Yadav

  2. Plant Molecular Biology Laboratory, Agri Biotech Foundation (Formerly AP Netherlands Biotechnology Programme), PJTS Agricultural University Campus, Rajendranagar, Hyderabad, 500 030, India

    Gopala Krishna Mekala, Vijaya Naresh Juturu & Garladinne Mallikarjuna

  3. Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Hyderabad, 500 046, India

    P. B. Kirti

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  1. Gopala Krishna Mekala
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  2. Vijaya Naresh Juturu
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  3. Garladinne Mallikarjuna
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  4. P. B. Kirti
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  5. S. K. Yadav
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Correspondence to Gopala Krishna Mekala or S. K. Yadav.

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Mekala, G.K., Juturu, V.N., Mallikarjuna, G. et al. Optimization of Agrobacterium-mediated genetic transformation of shoot tip explants of green gram (Vigna radiata (L.) Wilczek). Plant Cell Tiss Organ Cult 127, 651–663 (2016). https://doi.org/10.1007/s11240-016-1085-3

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  • DOI: https://doi.org/10.1007/s11240-016-1085-3

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