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Journal of Plant Growth Regulation

, Volume 26, Issue 3, pp 211–221 | Cite as

Effect of Gibberellin and Auxin on Parthenocarpic Fruit Growth Induction in the cv Micro-Tom of Tomato

  • Juan C. Serrani
  • Mariano Fos
  • Alejandro Atarés
  • José L. García-Martínez
Article

Abstract

The effect of applied gibberellin (GA) and auxin on fruit-set and growth has been investigated in tomato (Solanum lycopersicum L.) cv Micro-Tom. It was found that to prevent competition between developing fruits only one fruit per truss should be left on the plant. Unpollinated ovaries responded to GA3 and to different auxins [indol-3-acetic acid, naphthaleneacetic acid, and 2,4-dichlorophenoxyacetic acid (2,4-D)], 2,4-D being the most efficient. GA3- and 2,4-D-induced fruits had different internal morphology, with poor locular tissue development in the case of GA, and pseudoembryos development in the case of 2,4-D. Also, GA3 produced larger cells in the internal region of the mesocarp (IM) associated with higher mean C values, whereas 2,4-D produced more cell layers in the pericarp than pollinated fruits. The smaller size of GA3- compared with 2,4-D-induced fruits was due to them having fewer cells, only partially compensated by the larger size of IM cells. Simultaneous application of GA3 and 2,4-D produced parthenocarpic fruits similar to pollinated fruits, but for the absence of seeds, suggesting that both kinds of hormones are involved in the induction of fruit development upon pollination. It is concluded that Micro-Tom constitutes a convenient model system, compared to tall cultivars, to investigate the hormonal regulation of fruit development in tomato.

Keywords

Auxin Fruit growth Fruit-set Gibberellins Micro-Tom Parthenocarpic growth Tomato 

Notes

Acknowledgments

The authors thank Dr. A. Levy for providing the tomato cv Micro-Tom seeds, Dr. A. Granell for comments to the manuscript, and Dr. M. D. Gómez for microscopy support. The work was supported by Ministerio de Educación y Ciencia, Spain (grant project BIO2003-00151).

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Juan C. Serrani
    • 1
  • Mariano Fos
    • 2
  • Alejandro Atarés
    • 1
  • José L. García-Martínez
    • 1
  1. 1.Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC)Universidad Politécnica de ValenciaValenciaSpain
  2. 2.Departamento de Biología VegetalUniversidad Politécnica de ValenciaValenciaSpain

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