Combined Effects of Auxin Transport Inhibitors and Cytokinin: Alterations of Organ Development in Tobacco |
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| Authors: | Strabala, Timothy J. Wu, Yan H. Li, Yi |
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| Affiliation: | 1Department of Biochemistry, University of Missouri-Columbia Columbia, MO 65211 U.S.A.
2Division of Biology, Kansas State University Manhattan, KS 66506-4901 U.S.A. |
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| Abstract: | We have examined the effects of the auxin transport inhibitors1-naphthylphthalamic acid (NPA) and 2,3,5-triiodobenzoic acid(TIBA) on leaf morphogenesis of transgenic Nicotiana tabacum(cv. Xanthi) plants expressing the Agrobacterium tumefacienscytokinin biosynthetic gene, ipt. We have observed the formationof saucer-shaped leaf-like organs at the shoot apex and at lateralbuds. The formation of apical saucer-shaped leaf-like organscan be duplicated by the application of exogenous NPA and cytokininto wild-type tobacco seedlings. We have also observed adventitiousleaf-like organs with altered petiole and blade morphology inthe transgenic plants treated with auxin transport inhibitors.These results suggest that the combination of diminished auxintransport and elevated cytokinin can lead to alterations inleaf development in tobacco. 4Present address: Genesis Research and Development Corporation,P.O. Box 50, Auckland, New Zealand |
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