Vitamin E in Plants: Biosynthesis, Transport, and Function

Muñoz, Paula; Munné‐Bosch, Sergi

doi:10.1016/j.tplants.2019.08.006

Cited by 152 publications

(121 citation statements)

References 85 publications

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“…In fact, L decreases paralleled an accumulation of α-Toc/Chl in leaves in all studied cultivars, although significantly only for "Chemlali" rooted cuttings, "Chetoui S" and "Zarrazi S." Differences observed in α-Toc/Chl level could be related to genotypic differences in antioxidant capacity among olive trees. α-Tocopherol is involved in the elimination of 1 O 2 (Fahrenholtz et al, 1974;Muñoz and Munné-Bosch, 2019) and among other functions, α-tocopherol is known to inhibit the propagation of lipid peroxidation in thylakoid membranes by reducing the accumulation of lipid peroxyl radicals in chloroplasts (Munné-Bosch and Alegre, 2002;Muñoz and Munné-Bosch, 2019). α-Toc/Chl ratio was also associated with the decrease in Chl a + b, which may be related to the fact that this antioxidant can be synthesized using the phytol recycling pathway from chlorophyll degradation (in the so-called phytol recycling pathway, see Muñoz and Munné-Bosch, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…in the enzymatic activity against oxidative stress in olive trees (Sofo et al, 2004;Ben Ahmed et al, 2009, Ben Abdallah et al, 2017, but little is known about the role of non-enzymatic antioxidants on the tolerance of olive trees under drought stress conditions. Among them, carotenoids and tocopherols constitute the main protection system against ROS, including their role in quenching the singlet oxygen ( 1 O 2 ) and in the case of tocopherols additionally preventing lipid peroxidation in thylakoid membranes (Muñoz and Munné-Bosch, 2019). The increase in carotenoids contents is one of the mechanisms evolved by the olive tree to protect the photosynthetic apparatus against photooxidation (Bacelar et al, 2007;Ben Abdallah et al, 2017).…”

Section: Abbreviationsmentioning

confidence: 99%

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Linking Leaf Water Potential, Photosynthesis and Chlorophyll Loss With Mechanisms of Photo- and Antioxidant Protection in Juvenile Olive Trees Subjected to Severe Drought

et al. 2020

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The identification of drought-tolerant olive tree genotypes has become an urgent requirement to develop sustainable agriculture in dry lands. However, physiological markers linking drought tolerance with mechanistic effects operating at the cellular level are still lacking, in particular under severe stress, despite the urgent need to develop these tools in the current frame of global change. In this context, 1-year-old olive plants growing in the greenhouse and with a high intra-specific variability (using various genotypes obtained either from cuttings or seeds) were evaluated for drought tolerance under severe stress. Growth, plant water status, net photosynthesis rates, chlorophyll contents and the extent of photo- and antioxidant defenses (including the de-epoxidation state of the xanthophyll cycle, and the contents of carotenoids and vitamin E) were evaluated under well-watered conditions and severe stress (by withholding water for 60 days). Plants were able to continue photosynthesizing under severe stress, even at very low leaf water potential of −4 to −6 MPa. This ability was achieved, at least in part, by the activation of photo- and antioxidant mechanisms, including not only increased xanthophyll cycle de-epoxidation, but also enhanced α-tocopherol contents. “Zarrazi” (obtained from seeds) and “Chemlali” (obtained from cuttings) showed better performance under severe water stress compared to the other genotypes, which was associated to their ability to trigger a higher antioxidant protection. It is concluded that (i) drought tolerance among the various genotypes tested is associated with antioxidant protection in olive trees, (ii) the extent of xanthophyll cycle de-epoxidation is strongly inversely related to photosynthetic rates, and (iii) vitamin E accumulation is sharply induced upon severe chlorophyll degradation.

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Section: Discussionmentioning

confidence: 99%

Section: Abbreviationsmentioning

confidence: 99%

Linking Leaf Water Potential, Photosynthesis and Chlorophyll Loss With Mechanisms of Photo- and Antioxidant Protection in Juvenile Olive Trees Subjected to Severe Drought

et al. 2020

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“…Analysis of the barley protein sequence by ChloroP (http://www.cbs.dtu.dk/services/ChloroP/, accessed 5 Aug. 2020) indicated this protein had a chloroplast transit peptide (73 amino acids; score = 0.504) and showed 89% similarity to the tomato TBP and 74% homology to the human TBP (Supplemental Figure S3). The identification of TBP in plants suggests tocopherols play a role in inter‐ and/or intraorganellar communication (Munoz & Munne‐Bosch, 2019), which warrants further investigation.…”

Section: Discussionmentioning

confidence: 99%

Genome‐wide association analysis of natural variation in seed tocochromanols of barley

Mahalingam¹,

Sallam

Steffenson

et al. 2020

The Plant Genome

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Tocochromanols (tocols for short), commonly called Vitamin E, are lipid-soluble plant antioxidants vital for regulating lipid peroxidation in chloroplasts and seeds. Barley (Hordeum vulgare L.) seeds contain all eight different isoforms of tocols; however, the extent of natural variation in their composition and their underlying genetic basis is not known. Tocol levels in barley seeds were quantified in diverse H. vulgare panels comprising 297 wild lines from a diversity panel and 160 cultivated spring-type accessions from the mini-core panel representing the genetic diversity of the USDA barley germplasm collection. Significant differences were observed in the concentration of tocols between the two panels. To identify the genes associated with tocols, genome-wide association analysis was conducted with single nucleotide polymorphisms (SNPs) from Illumina arrays for the mini-core panel and genotyping-by-sequencing for the wild barley panel. Forty unique SNPs in the wild barley and 27 SNPs in the mini-core panel were significantly associated with various tocols. Marker-trait associations (MTAs) were identified on chromosomes 1, 6, and 7 for key genes in the tocol biosynthesis pathway, which have also been reported in other studies. Several novel MTAs were identified on chromosomes 2, 3, 4 and 5 and were found to be in proximity to genes involved in the generation of precursor metabolites required for tocol biosynthesis. This study provides a valuable resource for barley breeding programs targeting specific isoforms of seed tocols and for investigating the physiological roles of these metabolites in seed longevity, dormancy, and germination.

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“…Vitamin E can also contribute to the modulation of ROS accumulation and then play a role in photoprotection when leaves are subjected to photo-oxidative stress. This effect associated with modulation of lipid peroxidation can be linked to the role, recently underlined, of vitamin E in stress sensing and intracellular signaling (Muñoz and Munné-Bosch 2019).…”

Section: Bioactive Constituentsmentioning

confidence: 96%

“…Phytol is released during chlorophyll breakdown via the intermediate chlorophyll phy , chlorophyll linked to a phytyl moiety. This alternative metabolic way, known as the phytol recycling pathway, occurs in plants both in responses to environmental stresses and during developmental processes such as leaf or flowers senescence, seed maturation, or ripening of fruits (Fritsche et al 2017; Mène-Saffrané and DellaPenna 2010; Muñoz and Munné-Bosch 2019;vom Dorp et al 2015). In tocopherol biosynthesis, HGA is condensed with phytyl-PP by means of homogentisic acid phytyl transferase to form 2-methyl-6-phytyl-1,4-benzoquinol (MPBQ), which will be the common precursor to all tocopherols.…”

Section: Bioactive Constituentsmentioning

confidence: 99%

Plant Kingdom as Source of Vitamins

Hennebelle¹

2020

Handbook of Dietary Phytochemicals

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A vitamin is an organic substance necessary, in small quantities, for the correct functioning of the metabolism of a living organism. It is an essential nutrient because this substance cannot be synthesized in sufficient quantity by this organism and thus must be provided through the food intake. Each organism has specific needs: a molecule can be a vitamin for one species and not be it for another. It is the case for example of Vitamin C. Some vitamins are water-soluble compounds, including all vitamin Bs (B1, B2, B3, B5, B6, B7, B9, B12) and vitamin C. Others are fat-soluble compounds and encompass vitamins A, D, E, and K. In this chapter, we have chosen to provide an overview of recent literature data only about vitamins provided exclusively or significantly by plant food, in particular vitamins A (as provitaminic carotenoids), B1, B9, C, E, and K1. Vitamins provided by animal food, such as vitamin D or vitamin B12, will be not discussed in this chapter.

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Vitamin E in Plants: Biosynthesis, Transport, and Function

Cited by 152 publications

References 85 publications

Linking Leaf Water Potential, Photosynthesis and Chlorophyll Loss With Mechanisms of Photo- and Antioxidant Protection in Juvenile Olive Trees Subjected to Severe Drought

Linking Leaf Water Potential, Photosynthesis and Chlorophyll Loss With Mechanisms of Photo- and Antioxidant Protection in Juvenile Olive Trees Subjected to Severe Drought

Genome‐wide association analysis of natural variation in seed tocochromanols of barley

Plant Kingdom as Source of Vitamins

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