Abstract
The effect of two different dissolved oxygen (DO) concentrations (50 and 80%) on differentiation of somatic embryos (SE) from cell suspensions of coffee (Coffea arabica cv. Catimor 9722) was analyzed. Two bioreactors CMF-100 (CHEMAP AG) designed for the culture of cells, with 2-l glass vessels and a maximum work volume of 1.8 l were used. Each one was equipped with a gas blending unit (air, O2, N2, CO2) for the control of DO concentration. The inoculation density of embryogenic cells was 1.0 gram of fresh weight per liter (g FW l−1). The number of somatic embryos was greater (71 072 SE l−1) with 80% DO, but the major proportion were globular and heart shaped SE (66 399 SE l−1) and only 6.6% with regard to total was torpedo shaped SE. However, the 50% DO produced the higher number in the torpedo shaped SE (7389 SE l−1) what represented 20.0% with regard to total. Thus, higher concentrations of DO induced globular and heart shaped SE differentiation, but for production of torpedo shaped SE lower concentrations DO are needed. The somatic embryos obtained in the bioreactor with 50% DO showed similar behavior to the somatic embryos obtained in the rotary shaker. After 8 weeks of culture, 49.2% germination was obtained, which allowed a total of 1725 plantlet to be transferred to conditions ex vitro. After 6 months of culture, 89.2% of conversion was achieved and 1539 plants obtained were transferred to field conditions.
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de Feria, M., Jiménez, E., Barbón, R. et al. Effect of dissolved oxygen concentration on differentiation of somatic embryos of Coffea arabica cv. Catimor 9722. Plant Cell, Tissue and Organ Culture 72, 1–6 (2003). https://doi.org/10.1023/A:1021202305692
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DOI: https://doi.org/10.1023/A:1021202305692