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Influence of exogenous proline on embryogenic and organogenic maize callus subjected to salt stress

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Abstract

The effect of exogenous proline (6 mM) and increasing NaCl doses (from 0.4 to 1.2% w/v) on the maintenance of organogenic and embryogenic callus lines derived from the salt-sensitive maize inbred W64Ao2 were studied. To this end, total protein, free amino acid and polyamine content were analyzed. The demand of exogenous nitrogen and especially of proline, even in the presence of salt, differed in the two types of morphogenic calluses. The total protein content of embryogenic calluses was higher in the presence of proline than in its absence, in all the cases studied. An opposite effect of proline was observed in organogenic calluses: the presence of proline and salt decreased significantly their protein content. With respect to amino acid and polyamine contents, the organogenic calluses showed physiological characteristics of salt-adaptation, whereas the embryogenic calluses were more sensitive to NaCl. Although endogenous proline increased in the organogenic calluses cultured in the presence of salt, in embryogenic calluses it only rose at the lowest salt concentration. Furthermore, the endogenous arginine content under saline conditions was higher in organogenic calluses. A compensatory effect between proline and polyamine metabolism related to the endogenous arginine content in response to salt stress was also observed. This effect differed in the two types of calluses.

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Abbreviations

Ala:

alanine

Arg:

arginine

2,4-d :

2,4-dichlorophenoxyacetic acid

EC:

embryogenic callus

GABA:

γ-amino butyric acid

MC:

meristematic callus

PAs:

polyamines

Pro:

proline

Put:

putrescine

Spd:

spermidine

Spm:

spermine

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Authors and Affiliations

  1. Department of Molecular Genetics, Centre d'Investigacio i Desenvolupament de Barcelona. CSIC, Jordi Girona 18-26, 08034, Barcelona, Spain

    M. A. Santos, T. Camara, P. Rodriguez, I. Claparols & J. M. Torné

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  1. M. A. Santos
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  2. T. Camara
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  3. P. Rodriguez
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  4. I. Claparols
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  5. J. M. Torné
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Santos, M.A., Camara, T., Rodriguez, P. et al. Influence of exogenous proline on embryogenic and organogenic maize callus subjected to salt stress. Plant Cell Tiss Organ Cult 47, 59–65 (1996). https://doi.org/10.1007/BF02318966

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  • DOI: https://doi.org/10.1007/BF02318966

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