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. 2023 Feb 14;14:1124750. doi: 10.3389/fpls.2023.1124750

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Copyright © 2023 Harbart, Frede, Fitzner and Baldermann

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Total carotenoid content affected by polytunnel cultivation. Carotenoid content (ng mg^-1 DM) in lettuce grown without or under polytunnels with and without antifogging additives. (A) Individual carotenoids β-/ϵ-branch and downstream, (B) upper pathway metabolite phytoene, and (C) total carotenoids. First experimental repetition in April is shown. The data are expressed as mean ± SE (n = 4). Significant differences (p ≤ 0.05) between treatment of individual compounds and total content are indicated by different letters; no letters indicate absence of significance.