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• W2327432550 endingPage "2338" @default.
• W2327432550 startingPage "2325" @default.
• W2327432550 abstract "Carotenoids, chlorophylls and gibberellins are derived from the common precursor geranylgeranyl diphosphate (GGPP). One of the enzymes in carotenoid biosynthesis is lycopene β-cyclase (LCYB) that catalyzes the conversion of lycopene into β-carotene. In carrot, Dclcyb1 is essential for carotenoid synthesis in the whole plant. Here we show that when expressed in tobacco, increments in total carotenoids, β-carotene and chlorophyll levels occur. Furthermore, photosynthetic efficiency is enhanced in transgenic lines. Interestingly, and contrary to previous observations where overexpression of a carotenogenic gene resulted in the inhibition of the synthesis of gibberellins, we found raised levels of active GA4 and the concommitant increases in plant height, leaf size and whole plant biomass, as well as an early flowering phenotype. Moreover, a significant increase in the expression of the key carotenogenic genes, Ntpsy1, Ntpsy2 and Ntlcyb, as well as those involved in the synthesis of chlorophyll (Ntchl), gibberellin (Ntga20ox, Ntcps and Ntks) and isoprenoid precursors (Ntdxs2 and Ntggpps) was observed. These results indicate that the expression of Dclcyb1 induces a positive feedback affecting the expression of isoprenoid gene precursors and genes involved in carotenoid, gibberellin and chlorophyll pathways leading to an enhancement in fitness measured as biomass, photosynthetic efficiency and carotenoid/chlorophyll composition." @default.
• W2327432550 created "2016-06-24" @default.
• W2327432550 creator A5016083043 @default.
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• W2327432550 creator A5066723039 @default.
• W2327432550 creator A5069254162 @default.
• W2327432550 creator A5088644729 @default.
• W2327432550 date "2016-02-18" @default.
• W2327432550 modified "2023-10-02" @default.
• W2327432550 title "Increased<i>Nicotiana tabacum</i>fitness through positive regulation of carotenoid, gibberellin and chlorophyll pathways promoted by<i>Daucus carota</i>lycopene β-cyclase (<i>Dclcyb1</i>) expression" @default.
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• W2327432550 doi "https://doi.org/10.1093/jxb/erw037" @default.
• W2327432550 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4809289" @default.
• W2327432550 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26893492" @default.
• W2327432550 hasPublicationYear "2016" @default.
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