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. 2022 Jan 21;12:792832. doi: 10.3389/fpls.2021.792832

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Copyright © 2022 Yao, Jia, Cheng, Ruan, Ye, Wang, Yao, Zhou, Liu, Yu, Zhang, Yin, Diao and Wan.

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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Evolutionary origin of carotenoid cleavage oxygenase (CCO) proteins in plant species. The unrooted tree was constructed using the neighbor-joining (NJ) method in MEGA5.0 software. The parameters were 1,000 bootstraps. The CCO proteins were classified into two groups: I and II. The former was subdivided into CCD7 and CCD8, while the latter was subdivided into CCD1, CCD-like, CCD4, and NCED.