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Factors controlling somatic embryogenesis

Cell wall changes as an in vivomarker of embryogenic competence

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Abstract

Histological and ultrastructural, molecular and elemental distribution changes were investigated during the induction of direct somatic embryogenesis using theCamellia japonica leaf culture system. In this culture system, direct somatic embryogenesis is induced in a controlled way in a specific leaf region (leaf blade) within a leaf. Embryogenic and non-embryogenic leaf regions have characteristic energy-dispersive X-ray spectra already before induction. According to these results electron probe X-ray microanalysis (EPMA) can be a tool for early diagnosis of embryogenic competence. Histological studies showed that severe fluctuations in the number of calcium oxalate crystals and in starch accumulation occur after induction but only in induced tissues. Changes in the cell wall composition of competent cells occur shortly after the induction treatment. The induction of morphogenesis is linked to the appearance of callose covering the surface cells of induced leaves and calluses. A 2nd deposition of material (cutin) is necessary for normal somatic embryogenesis to occur. The involvement of lipid transfer proteins in the appearance of cutin in the embryogenic regions of the explant is suggested.

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  1. Departamento de Biologia Vegetal, Faculdade de Ciências de Lisboa, Bloco C2, Piso 1, Campo Grande, P-1700, Lisbba, Portugal

    M. Cristina Pedroso & M. Salomé Pais

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  1. M. Cristina Pedroso
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  2. M. Salomé Pais
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Pedroso, M.C., Pais, M.S. Factors controlling somatic embryogenesis. Plant Cell Tiss Organ Cult 43, 147–154 (1995). https://doi.org/10.1007/BF00052170

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