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Plant Cell, Tissue and Organ Culture

, Volume 34, Issue 1, pp 1–11 | Cite as

Influence of some exogenous amino acids on the production of maize embryogenic callus and on endogenous amino acid content

  • I. Claparols
  • M. A. Santos
  • J. M. Torné
Article

Abstract

The effects of four exogenous amino acids (proline, glycine, asparagine and serine) on the production of maize embryogenic callus and on its endogenous amino acid content have been investigated. For this purpose, an established embryogenic line of Type 1 callus from the inbred W64Ao2 has been used. From the results it may be concluded that a concentration of proline exceeding 6 mM is negative for the production of embryogenic callus. When proline is eliminated from the medium, other amino acids tested in certain concentrations yield a percentage of embryogenic callus production that exceeds or equals that of proline. The endogenous free proline content in embryogenic callus is significantly higher than that in non-embryogenic callus regardless of proline presence in the medium. The only exception are the glycine-containing media, in which endogenous free alanine of embryogenic callus increases at the expense of endogenous free proline. This study suggest a positive role of endogenous free proline or alanine accumulation in the embryogenic callus production which might be related to an adaptation to the metabolic changes produced by in vitro culture and embryogenesis induction. Furthermore, these results indicate that treatments with amino acids that are different from proline can be used to improve the efficiency of embryogenic callus production from well established maize callus cultures.

Key words

embryogenic Type 1 callus free amino acids somatic embryogenesis 

Abbreviations

Ala

alanine

Asn

asparagine

2,4-d

2,4-dichlorophenoxyacetic acid

EC

embryogenic callus

nEC

non-embryogenic callus

Gaba

gamma-aminobutyric acid

Glu

glutamic acid

Gly

glycine

Pro

proline

Ser

serine

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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • I. Claparols
    • 1
  • M. A. Santos
    • 1
  • J. M. Torné
    • 1
  1. 1.Laboratory of Plant Tissue Culture, Departament d'AgrobiologíaCentre d'Investigació i Desenvolupament de Barcelona (C.I.D.). C.S.I.C.BarcelonaSpain

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