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Article

Carotenoid Cleavage Dioxygenases: Identification, Expression, and Evolutionary Analysis of This Gene Family in Tobacco

1
National Tobacco Cultivation & Physiology & Biochemistry Research Centre, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China
2
Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou 450002, China
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2019, 20(22), 5796; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms20225796
Received: 19 September 2019 / Revised: 13 November 2019 / Accepted: 15 November 2019 / Published: 18 November 2019
(This article belongs to the Section Molecular Genetics and Genomics)
Carotenoid cleavage dioxygenases (CCDs) selectively catalyze carotenoids, forming smaller apocarotenoids that are essential for the synthesis of apocarotenoid flavor, aroma volatiles, and phytohormone ABA/SLs, as well as responses to abiotic stresses. Here, 19, 11, and 10 CCD genes were identified in Nicotiana tabacum, Nicotiana tomentosiformis, and Nicotiana sylvestris, respectively. For this family, we systematically analyzed phylogeny, gene structure, conserved motifs, gene duplications, cis-elements, subcellular and chromosomal localization, miRNA-target sites, expression patterns with different treatments, and molecular evolution. CCD genes were classified into two subfamilies and nine groups. Gene structures, motifs, and tertiary structures showed similarities within the same groups. Subcellular localization analysis predicted that CCD family genes are cytoplasmic and plastid-localized, which was confirmed experimentally. Evolutionary analysis showed that purifying selection dominated the evolution of these genes. Meanwhile, seven positive sites were identified on the ancestor branch of the tobacco CCD subfamily. Cis-regulatory elements of the CCD promoters were mainly involved in light-responsiveness, hormone treatment, and physiological stress. Different CCD family genes were predominantly expressed separately in roots, flowers, seeds, and leaves and exhibited divergent expression patterns with different hormones (ABA, MeJA, IAA, SA) and abiotic (drought, cold, heat) stresses. This study provides a comprehensive overview of the NtCCD gene family and a foundation for future functional characterization of individual genes. View Full-Text
Keywords: CCDs; Nicotiana tabacum; genome-wide identification; hormones and abiotic stresses; gene expression CCDs; Nicotiana tabacum; genome-wide identification; hormones and abiotic stresses; gene expression
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MDPI and ACS Style

Zhou, Q.; Li, Q.; Li, P.; Zhang, S.; Liu, C.; Jin, J.; Cao, P.; Yang, Y. Carotenoid Cleavage Dioxygenases: Identification, Expression, and Evolutionary Analysis of This Gene Family in Tobacco. Int. J. Mol. Sci. 2019, 20, 5796. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms20225796

AMA Style

Zhou Q, Li Q, Li P, Zhang S, Liu C, Jin J, Cao P, Yang Y. Carotenoid Cleavage Dioxygenases: Identification, Expression, and Evolutionary Analysis of This Gene Family in Tobacco. International Journal of Molecular Sciences. 2019; 20(22):5796. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms20225796

Chicago/Turabian Style

Zhou, Qianqian, Qingchang Li, Peng Li, Songtao Zhang, Che Liu, Jingjing Jin, Peijian Cao, and Yongxia Yang. 2019. "Carotenoid Cleavage Dioxygenases: Identification, Expression, and Evolutionary Analysis of This Gene Family in Tobacco" International Journal of Molecular Sciences 20, no. 22: 5796. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms20225796

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