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    • Trenner 0
    • Molecular Signal Processing
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Horvath, G.; Wessjohann, L.; Bigirimana, J.; Jansen, M.; Guisez, Y.; Caubergs, R.; Horemans, N.; Differential distribution of tocopherols and tocotrienols in photosynthetic and non-photosynthetic tissues Phytochemistry 67 1185-1195 (2006) DOI: 10.1016/j.phytochem.2006.04.004
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Tocopherols and tocotrienols are vitamin E compounds, differing only in the saturation state of the isoprenoid side chain. Tocopherol biosynthesis, physiology and distribution have been studied in detail. Tocopherols have been found in many different plant species, and plant tissues. In contrast, comparatively little is known about the physiology and distribution of tocotrienols. These compounds appear to be considerably less widespread in the plant kingdom. In this study 80 different plant species were analysed for the presence of tocotrienols. Twenty-four species were found to contain significant amounts of tocotrienols. No taxonomic relation was apparent among the 16 dicotyledonous species that were found to contain tocotrienol. Monocotyledonous species (eight species) belonged either to the Poaceae (six species) or the Aracaceae (two species).A more detailed analysis of tocotrienol accumulation revealed the presence of tocotrienols in several non-photosynthetic tissues and organs, i.e. seeds, fruits and in latex, in concentrations up to 2000 ppm. No tocotrienols could be detected in mature photosynthetic tissues. However, we found the transient accumulation of low levels of tocotrienols in the young coleoptiles of plant species whose seeds contained tocotrienols. No measurable tocotrienol biosynthesis was apparent in coleoptiles, or in chloroplasts isolated from such coleoptiles. In line with these results, we found that tocotrienol accumulation in coleoptiles was not associated with chloroplasts. Based on our data, we conclude that tocotrienols may be transiently present in photosynthetically active tissues, however, it remains to be proven whether the tocotrienols are biosynthesised in such tissues, or imported from elsewhere in the plant.

Publications

Horvath, G.; Wessjohann, L.; Bigirimana, J.; Monica, H.; Jansen, M.; Guisez, Y.; Caubergs, R.; Horemans, N.; Accumulation of tocopherols and tocotrienols during seed development of grape (Vitis vinifera L. cv. Albert Lavallée) Plant Physiol. Biochem. 44 724-731 (2006) DOI: 10.1016/j.plaphy.2006.10.010
  • Abstract
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Tocopherols and tocotrienols are present in mature seeds. Yet, little is known about the physiological role and the metabolism of these compounds during seed development. Here we present data on tocopherol and tocotrienol accumulation during seed development in Vitis vinifera L. cv. Albert Lavallée (Royal). This species was chosen for its ability to synthesize both tocopherols and tocotrienols. It is shown here for the first time that during seed development there are significant differences in localization and accumulation kinetics of tocopherols and tocotrienols. Tocopherols are found homogeneously dispersed throughout all tissues of the seed, in concentrations ranging from 20 to 100 μg tocopherol per g dry weight. Tocopherol levels decrease gradually during seed development. In contrast, tocotrienols are only found in the endosperm of the seeds, accumulating in a sigmoid fashion during the maturation period of seed development. Tocotrienol levels were found to be (54 ± 7.4) μg/g dry seed in 90-day-old seeds of V. vinifera L. Furthermore, tocotrienol biosynthesis is demonstrated in these seeds during tocotrienol accumulation and in an endosperm fraction isolated at 75 days after flowering.

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