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Thidiazuron-induced hypertrophic growth from foliar disks of Kalanchoe pinnata leads to visualization of a bioactive auxin gradient across the leaf plane

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Abstract

Thidiazuron induces a variety of effects in foliar explants of K. pinnata cultured in vitro. Of these, the induction of an organized hypertrophic growth at the vein ending on the proximal side of leaf disks is a significant morphogenetic effect. This polarized hypertrophy is considered an exclusive auxin-mediated response, as the effect is completely reversed by auxin efflux inhibitor 2,3,5-triiodobenzoic acid. With the magnitude of hypertrophic growth from individual disks taken as a manifestation of putative auxin levels, the occurrence of a gross, decreasing bioactive auxin gradient from median-basal to peripheral locations across the leaf plane has been observed.

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Figure 1.

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Acknowledgment

The help of Mr. S. K. Das in photographic work is acknowledged with thanks.

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  1. Plant Physiology Laboratory, Department of Botany, University of Delhi, Delhi, 110 007, India

    Sarita Jaiswal & S. Sawhney

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  1. Sarita Jaiswal
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  2. S. Sawhney
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Correspondence to S. Sawhney.

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Editor: M. Kane

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Jaiswal, S., Sawhney, S. Thidiazuron-induced hypertrophic growth from foliar disks of Kalanchoe pinnata leads to visualization of a bioactive auxin gradient across the leaf plane. In Vitro Cell.Dev.Biol.-Plant 44, 65–68 (2008). https://doi.org/10.1007/s11627-007-9084-z

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  • DOI: https://doi.org/10.1007/s11627-007-9084-z

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