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Plant and Cell Physiology, 1996, Vol. 37, No. 8 1177-1182
© 1996

Short Communication

Combined Effects of Auxin Transport Inhibitors and Cytokinin: Alterations of Organ Development in Tobacco

Timothy J. Strabala1,4, Yan H. Wu2 and Yi Li2,3

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.

3Author for correspondence. FAX: (913) 532-6653. E-mail: yili{at}ksu.ksu.edu

We have examined the effects of the auxin transport inhibitors 1-naphthylphthalamic acid (NPA) and 2,3,5-triiodobenzoic acid (TIBA) on leaf morphogenesis of transgenic Nicotiana tabacum (cv. Xanthi) plants expressing the Agrobacterium tumefaciens cytokinin biosynthetic gene, ipt. We have observed the formation of saucer-shaped leaf-like organs at the shoot apex and at lateral buds. The formation of apical saucer-shaped leaf-like organs can be duplicated by the application of exogenous NPA and cytokinin to wild-type tobacco seedlings. We have also observed adventitious leaf-like organs with altered petiole and blade morphology in the transgenic plants treated with auxin transport inhibitors. These results suggest that the combination of diminished auxin transport and elevated cytokinin can lead to alterations in leaf development in tobacco.

4Present address: Genesis Research and Development Corporation, P.O. Box 50, Auckland, New Zealand

(Received March 22, 1996; Accepted August 12, 1996)
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