Abstract
The aim of this work was to study morphological and biochemical aspects during zygotic embryogenesis in O. catharinensis, by measuring changes in the endogenous concentrations of proteins, amino acids, polyamines (PAs), indole-3-acetic acid (IAA) and abscisic acid (ABA). Buffer-soluble and insoluble protein contents were determined by spectrometry, and amino acids, PAs, IAA and ABA concentrations were determined by high performance liquid chromatography. Total amino acid accumulation, predominantly asparagine, occurred when the embryo showed completely developed cotyledons, with posterior reduction in the mature embryo. This decrease in total amino acid concentration in the mature embryo may result from their use in storage␣as well as for LEA protein synthesis. Free putrescine (Put) concentration decreased, while free spermine (Spm) increased during embryo development. This suggest a role for Put in the initial phases of embryogenesis when high rates of cell division occur, while elevated concentration of Spm are essential from the middle to the end of embryo development, when growth is mainly due to cell elongation. An IAA peak in zygotic embryos occurred during initial development, suggesting a link between growth and cellular division as well as with the establishment of bilateral symmetry. ABA concentration declined during initial stages of development then increased at the mature embryo stage, suggesting a possible relationship with dormancy and recalcitrance characteristics. Our results show that changes in the phytohormones (IAA, ABA and PAs) concentrations in combination with amino acids are likely important factors determining the developmental stages of O.␣catharinensis zygotic embryos.
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Abbreviations
- IAA:
-
Indole-3-acetic acid
- ABA:
-
Abscisic acid
- CV:
-
Coefficient of variation
- FM:
-
Fresh matter
- Gaba:
-
γ-Aminobutyric acid
- HPLC:
-
High performance liquid chromatography
- PAs:
-
Polyamines
- Put:
-
Putrescine
- Spd:
-
Spermidine
- Spm:
-
Spermine
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Acknowledgements
This research was carried out with financial support from the State of São Paulo Research Foundation (FAPESP) and the National Council for Scientific and Technological Development (CNPq). The authors thank M.Sc. Antônio da Silva and Instituto Florestal of São Paulo for providing O. catharinensis fruits.
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Santa-Catarina, C., Silveira, V., Balbuena, T.S. et al. IAA, ABA, polyamines and free amino acids associated with zygotic embryo development of Ocotea catharinensis . Plant Growth Regul 49, 237–247 (2006). https://doi.org/10.1007/s10725-006-9129-z
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DOI: https://doi.org/10.1007/s10725-006-9129-z