Amino Acids

, Volume 39, Issue 4, pp 949–962 | Cite as

Proline metabolism and transport in plant development

  • Silke Lehmann
  • Dietmar Funck
  • László Szabados
  • Doris Rentsch
Review Article

Abstract

Proline fulfils diverse functions in plants. As amino acid it is a structural component of proteins, but it also plays a role as compatible solute under environmental stress conditions. Proline metabolism involves several subcellular compartments and contributes to the redox balance of the cell. Proline synthesis has been associated with tissues undergoing rapid cell divisions, such as shoot apical meristems, and appears to be involved in floral transition and embryo development. High levels of proline can be found in pollen and seeds, where it serves as compatible solute, protecting cellular structures during dehydration. The proline concentrations of cells, tissues and plant organs are regulated by the interplay of biosynthesis, degradation and intra- as well as intercellular transport processes. Among the proline transport proteins characterized so far, both general amino acid permeases and selective compatible solute transporters were identified, reflecting the versatile role of proline under stress and non-stress situations. The review summarizes our current knowledge on proline metabolism and transport in view of plant development, discussing regulatory aspects such as the influence of metabolites and hormones. Additional information from animals, fungi and bacteria is included, showing similarities and differences to proline metabolism and transport in plants.

Keywords

Proline Plant Metabolism Transport Regulation Development 

Notes

Acknowledgments

We are grateful to the Swiss National Foundation (Grant no. 3100A0-107507), the University of Bern (Switzerland), the University of Konstanz (Germany) and Hungarian Scientific Research Fund (Grant no. K-68226).

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Silke Lehmann
    • 1
  • Dietmar Funck
    • 2
  • László Szabados
    • 3
  • Doris Rentsch
    • 1
  1. 1.Institute of Plant SciencesUniversity of BernBernSwitzerland
  2. 2.Department of Plant Physiology and BiochemistryKonstanz UniversityKonstanzGermany
  3. 3.Institute of Plant BiologyBiological Research CenterSzegedHungary

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