Efficient production of <Emphasis Type="Italic">Agrobacterium rhizogenes</Emphasis>-transformed roots and composite plants in peanut (<Emphasis Type="Italic">Arachis hypogaea</Emphasis> L.) |
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Authors: | Lili Geng Lihong Niu Peter M Gresshoff Changlong Shu Fuping Song Dafang Huang Jie Zhang |
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Institution: | (1) State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China;(2) ARC Centre of Excellence for Integrative Legume Research, The University of Queensland, St. Lucia, Brisbane, QLD, 4072, Australia;(3) Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, China; |
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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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