Abstract
Recalcitrance of most large-seeded legumes, such as peanut, to regeneration and genetic transformation has hampered studies on gene function and efforts for genetic improvement. Agrobacterium rhizogenes-mediated transformation provides a system for rapid and efficient transformation of plant tissues. In this study, embryonic axes along with cotyledons of peanut were injected with a suspension culture of A. rhizogenes using microliter syringes. The influence of several factors such as plant genotype, A. rhizogenes culture stage, co-culture period of A. rhizogenes, and acetosyringone concentration in the co-cultivation medium have been evaluated. It is found that A. rhizogenes-mediated transformation of peanut is genotype-independent. Up to 61% transformation was recorded when embryonic axes were co-cultivated with 5 × 107 A. rhizogenes cells from logarithmic phase for 2 days on co-culture medium containing 50 μmol l−1 acetosyringone. Composite plants with transgenic roots were harvested after 45 days of treatment. Furthermore, this method was applied to assess the insecticidal activity of a synthetic cry8Ea1 gene against Holotrichia parallela in transgenic roots of peanut.
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Abbreviations
- DIRC:
-
Days of induced roots emerging after co-cultivation
- NC:
-
Non-transgenic control
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Acknowledgments
This study was sported by 973 Projects of China (2009CB118902) and National Science and Technology Major Project (2009ZX08009-030B). We thank the Australian Research Council for Centre of Excellence funding to PMG. PMG also is a Senior Professorial Fellow of the CAS.
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Geng, L., Niu, L., Gresshoff, P.M. et al. Efficient production of Agrobacterium rhizogenes-transformed roots and composite plants in peanut (Arachis hypogaea L.). Plant Cell Tiss Organ Cult 109, 491–500 (2012). https://doi.org/10.1007/s11240-012-0113-1
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DOI: https://doi.org/10.1007/s11240-012-0113-1