Abstract
Mass regeneration of Coffea arabica L. somatic embryos using a temporary immersion bioreactor was improved by optimizing the immersion cycles, i.e. both the duration and the frequency of immersions. It was demonstrated that increasing the frequency of short immersions (1 min immersions every 24, 12 and 4 h) stimulated embryo production (480, 2,094 and 3,081 embryos/1-l bioreactor, respectively) and improved quality (60, 79 and 85 of torpedo shaped embryos, respectively). On the other hand, an increase in the immersion duration (1, 5 and 15 min) inhibited embryo regeneration (from 2,094 to 428 embryos per 1-l bioreactor) and negatively affected their morphological quality (from 79 to 49 torpedo-shaped embryos) and the conversion of embryos into plants (from 70 to 33). A 15 min immersion duration applied every 4 h produced hyperhydric symptoms in 90 of the embryos. Hyperhydric embryos were characterized by higher fresh weight and water content, more negative values for water potential and higher K+ content when compared to normal torpedo-shaped embryos. Micrographs showed structural problems in the globular stage, such as the existence of an irregular epidermis and an absence of reserves. Whatever the immersion cycle used, the somatic embryos exhibited water and mineral characteristics very different from those of their zygotic counterparts. The use of 1 min immersions every 4 h led to the production of the largest quantities of torpedo-shaped embryos without hyperhydricity that succeeded in regenerating plants (75 conversion).
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Abbreviations
- BAP:
-
benzylaminopurine
- 2,4-D:
-
2,4-dichlorophenoxyacetic acid
- IBA:
-
indole-3-butyric acid
- iP:
-
isopentenyladenine
- MS:
-
Murashige and Skoog, 1962
- NBB:
-
naphthol blue black
- PAS:
-
periodic acid-Schiff
- Π:
-
osmotic potential
- P:
-
turgor potential
- WC:
-
water content
- Ψ:
-
water potential
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Albarrán, J., Bertrand, B., Lartaud, M. et al. Cycle characteristics in a temporary immersion bioreactor affect regeneration, morphology, water and mineral status of coffee (Coffea arabica) somatic embryos. Plant Cell Tiss Organ Cult 81, 27–36 (2005). https://doi.org/10.1007/s11240-004-2618-8
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DOI: https://doi.org/10.1007/s11240-004-2618-8