Inhibition of Agrobacterium-Induced Cell Death by Antiapoptotic Gene Expression Leads to Very High Transformation Efficiency of Banana

Khanna, Harjeet K., Paul, Jean-Yves, Harding, Robert M., Dickman, Martin B., & Dale, James L. (2007) Inhibition of Agrobacterium-Induced Cell Death by Antiapoptotic Gene Expression Leads to Very High Transformation Efficiency of Banana. Molecular Plant Microbe Interactions, 20(9), pp. 1048-1054.

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The death of plant cells in culture following exposure to Agrobacterium tumefaciens remains a major obstacle in developing Agrobacterium-mediated transformation into a highly efficient genotype-independent technology. Here, we present evidence that A. tumefaciens exposure induces cell death in banana cell suspensions. More than 90% of embryogenic banana cells died after exposure to A. tumefaciens and cell death was accompanied by a subset of features associated with apoptosis in mammalian cells, including DNA laddering, fragmentation, and formation of apoptoticlike bodies. Importantly, these cellular responses were inhibited in cells expressing the animal antiapoptosis genes Bcl-xL, Bcl-2 3′ untranslated region, and CED-9. Inhibition of cell death resulted in up to 90% of cell clumps transformed with Bcl-xL, a 100-fold enhancement over vector controls, approaching the transformation and regeneration of every “transformable” cell. Similar results using sugarcane, a crop plant known for recalcitrance to Agrobacterium transformation, suggest that antiapoptosis genes may inhibit these phenomena and increase the transformation frequency of many recalcitrant plant species, including the major monocot cereal crop plants. Evidence of inhibition of plant cell death by cross-kingdom antiapoptotic genes also contributes to the growing evidence that genes for control of programmed cell death are conserved across wide evolutionary distances, even though these mechanisms are not well understood in plants.

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25 citations in Scopus
22 citations in Web of Science®
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ID Code: 9017
Item Type: Journal Article
Refereed: Yes
Keywords: Apoptosis, necrosis, programmed cell death, banana, Bcl, xL, Bcl, 2, ced, 9
DOI: 10.1094/MPMI-20-9-1048
ISSN: 0894-0282
Subjects: Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > MEDICAL BIOTECHNOLOGY (100400) > Medical Molecular Engineering of Nucleic Acids and Proteins (100403)
Divisions: Current > Research Centres > Centre for Tropical Crops and Biocommodities
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2007 American Phytopathological Society
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 16 Aug 2007 00:00
Last Modified: 29 Feb 2012 13:38

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