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Establishment of somaclonal variants of Robusta coffee with reduced levels of cafestol and kahweol

  • Plant Tissue Culture
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Abstract

Cafestol (caf) and kahweol (kah) are two diterpenes uniquely associated with the unsaponified lipid fraction of coffee brew and are reported to be responsible for an increase in serum cholesterol and triglyceride levels. The plant growth regulators (PGRs) indole-3-acetic acid (IAA), N 6-benzyladenine (BA), and thidiazuron (TDZ); the plant growth-promoting agents silver nitrate, triacontanol (TRIA), and coconut water; and some PGR antagonists such as lovastatin, paclobutrazol, and 2,3,5-triiodobenzoic acid (TIBA) were used to determine the variation of caf and kah in somatic embryos of Robusta coffee (Coffea canephora, CxR variety). Embryogenic (EG) medium was comprised of half-strength Murashige and Skoog basal components (½MS) supplemented with 2.85 μM IAA and 1.11 μM BA. After an 8-wk culture, somatic embryos were subjected to diterpene extraction and HPLC analysis of caf and kah profiles. TRIA-supplemented (5 μg L−1) EG medium devoid of IAA reduced the levels of caf and kah by 18–24 and 48–55%, respectively, in coffee somatic embryos. Similarly, the combination of 2.85 μM IAA, 2.27 μM TDZ, and 5–10% coconut water in ½MS basal medium drastically reduced the caf and kah levels in somatic embryos. There was 60–75% reduction in both caf and kah in the presence of 5 μM TIBA, followed by 56–62% reduction in the presence of 10 μM silver nitrate. In contrast, there was 25–32% elevation of caf and kah in EG medium supplemented with 5 μM paclobutrazol. In this study, for the first time, somaclonal variants of C. canephora with reduced levels of diterpenes caf and kah were established. Furthermore, these lines exhibited consistency in their metabolite profiles when cultivated under greenhouse conditions. In-depth investigations at physiological level are warranted in order to elucidate the actual mechanism of these PGR inhibitors on alterations in endogenous pools of diterpenes in coffee somatic embryos.

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Acknowledgements

The authors are thankful to the Department of Science and Technology, New Delhi, for financial assistance.

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  1. Plant Cell Biotechnology Department, CSIR-Central Food Technological Research Institute, Mysore, 570 020, India

    Vaddadi Sridevi & Parvatam Giridhar

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  1. Vaddadi Sridevi
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  2. Parvatam Giridhar
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Correspondence to Parvatam Giridhar.

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Editor: John W. Forster

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Sridevi, V., Giridhar, P. Establishment of somaclonal variants of Robusta coffee with reduced levels of cafestol and kahweol. In Vitro Cell.Dev.Biol.-Plant 50, 618–626 (2014). https://doi.org/10.1007/s11627-014-9613-5

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  • DOI: https://doi.org/10.1007/s11627-014-9613-5

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