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8 resultados
Reaction specificities of the ε-ionone-forming lycopene cyclase from rice (Oryza sativa) elucidated in vitro.
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Lycopene cyclases responsible for the formation of ε-ionone rings (LCYe) mark a plant-specific bifurcation of carotenogenesis. We investigated purified rice LCYe (OsLCYe) in a liposome-based biphasic assay system. OsLCYe depends on reduced flavin cofactors stabilizing a transient state formed during
Comparative analysis of plant lycopene cyclases.
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Carotenoids are essential isoprenoid pigments produced by plants, algae, fungi and bacteria. Lycopene cyclase (LYC) commonly cyclize carotenoids, which is an important branching step in the carotenogenesis, at one or both end of the backbone. Plants have two types of LYC (β-LCY and ϵ-LCY). In this
Leaf variegation in the rice zebra2 mutant is caused by photoperiodic accumulation of tetra-cis-lycopene and singlet oxygen.
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In field conditions, the zebra2 (z2) mutant in rice (Oryza sativa) produces leaves with transverse pale-green/yellow stripes. It was recently reported that ZEBRA2 encodes carotenoid isomerase (CRTISO) and that low levels of lutein, an essential carotenoid for non-photochemical quenching, cause leaf
Comparative transcriptomics approach in elucidation of carotenoid biosynthesis regulation in grains of rice (Oryza sativa L.).
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Estimation of phytoene, lycopene, β-carotene, lutein, and zeaxanthin in grains of white, brown and purple cultivars of rice revealed marked differences in the levels of these carotenoid intermediates amongst the cultivars. Grains of white rice did not show any significant accumulation of carotenoid
Why is golden rice golden (yellow) instead of red?
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The endosperm of Golden Rice (Oryza sativa) is yellow due to the accumulation of beta-carotene (provitamin A) and xanthophylls. The product of the two carotenoid biosynthesis transgenes used in Golden Rice, phytoene synthase (PSY) and the bacterial carotene desaturase (CRTI), is lycopene, which has
Modern Breeding and Biotechnological Approaches to Enhance Carotenoid Accumulation in Seeds.
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There is an increasing demand for carotenoids, which are fundamental components of the human diet, for example as precursors of vitamin A. Carotenoids are also potent antioxidants and their health benefits are becoming increasingly evident. Protective effects against prostate cancer and age-related
Mutations of genes in synthesis of the carotenoid precursors of ABA lead to pre-harvest sprouting and photo-oxidation in rice.
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Pre-harvest sprouting (PHS) or vivipary in cereals is an important agronomic trait that results in significant economic loss. A considerable number of mutations that cause PHS have been identified in several species. However, relatively few viviparous mutants in rice (Oryza sativa L.) have been
Transcriptional-metabolic networks in beta-carotene-enriched potato tubers: the long and winding road to the Golden phenotype.
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Vitamin A deficiency is a public health problem in a large number of countries. Biofortification of major staple crops (wheat [Triticum aestivum], rice [Oryza sativa], maize [Zea mays], and potato [Solanum tuberosum]) with β-carotene has the potential to alleviate this nutritional problem.
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