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Journal of Plant Growth Regulation

, Volume 24, Issue 1, pp 36–40 | Cite as

Xylem and Phloem Derived Polyamines during Flowering in Two Diverse Rose Species

  • Shweta Sood
  • Pramod Kumar NagarEmail author
Short Communication

Abstract

Polyamine contents in xylem (root) and phloem (leaf) exudates in two diverse species of rose, viz. Rosa damascena Mill and Rosa bourboniana Desport, were analyzed before, during, and after flowering in the main flowering season, that is, April–May. Only free putrescine (Put) was detected in the xylem and phloem exudates at these time points, and it was high during the peak flowering period. In phloem, Put content was significantly higher in R. bourboniana than in R. damascena at all three stages; whereas in the xylem exudate it was relatively higher in R. damascena at the peak flowering period. A spray of α-difluoromethylornithine (DFMO), an irreversible inhibitor of the putrescine biosynthetic inhibitor ornithine decarboxylase (ODC), markedly decreased the flowering. This effect was reversed by application of Put alone or in combination with DFMO. The significance of this finding is discussed in light of polyamine translocation during flowering.

Key words:

Flower development Phloem Polyamines Rosa bourboniana Rosa damascena Translocation Xylem. 

Notes

Acknowledgments

The authors thank, Dr. P. S. Ahuja, Director, IHBT for necessary facilities; Department of Science and Technology, New Delhi, for financial support in the form of a research project; and Dr. Manoj K. Singh for help in statistical analysis.

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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  1. 1.Division of BiotechnologyInstitute of Himalayan Bioresource TechnologyPalampur India

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