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Suppression of carotenoid cleavage dioxygenase 1 (NtCCD1) increases carotenoid contents and attenuates reactive oxygen species (ROS) in Tobacco Leaves

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Abstract

Despite the nutritional and economic importance of carotenoids and their products, regulation of carotenoid content in leaves remains to be fully elucidated. Recent findings indicate that carotenoid content are determined, at least in part, by the activity of carotenoid cleavage dioxygenase 1 (CCD1). This study examined whether NtCCD1 affects leaf carotenoids in the model plant Nicotiana tabacum. Three NtCCD1s, NtCCD1a, NtCCD1b, and NtCCD1c, were investigated including their phylogenetic relationships, conserved motifs, and exon-intron architecture. Of the three transcripts, NtCCD1c exhibited the highest expression level in various tissue as determined by real-time PCR. Confocal microscopy indicated that all NtCCD1s are located in the cytoplasm. The enzymatic activity of the NtCCD1c protein was also studied by co-expressing NtCCD1c in Escherichia coli engineered to accumulate β-carotene or lycopene. SPME-GC-MS indicated that NtCCD1c cleaves β-carotene and lycopene specifically at the 9–10/9′-10′ site to produce β-ionone and pseudoionone, respectively. Virus-induced gene silencing (VIGS) of NbCCD1 increased carotenoid contents including β-carotene, α-carotene, zeaxanthin, phytoene, lutein, violaxanthin, neoxanthin, and β-cryptoxanthin, along with a decline in reactive oxygen species (ROS). RNA-seq of silenced plants suppressed NbCCD1 but enhanced expression of essential genes encoding antioxidant enzymes including NtGST, NtCuZnSOD, NtAAO, and NtPOD, along with a decrease in expression of genes related to carbon fixation such as NtRCA1, NtRCA2, and NtRBCS. These observations suggest that NtCCD1 is a negative regulator of carotenoid content and plays an essential role in the regulation of ROS levels in tobacco leaves.

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The datasets generated or analyzed during the current study are included in this article and its supplementary information files.

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Funding

The research leading to these results has received funding from the Cultivation Program for Young Backbone Teachers in Henan University of Technology, Science Project 110202101042 (JY 19)/ 2022530000241007, and 110202102033.

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Chen Dong and Yulong Gao designed the study and prepared the manuscript. Fei Du, Zongyu Hu and Lili Qin performed the experiments and modified the manuscript. Chen Zhang, Zhiwen Wang and Yongchun Shi analyzed the data. Xiaoran Wang and Ran Wang supervised the study. All authors approved the final version of the manuscript.

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Correspondence to Yulong Gao or Chen Dong.

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The authors have no relevant financial or non-financial interests to disclose.

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Communicated by Paul Holford.

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Fei Du, Zongyu Hu and Lili Qin these authors contributed equally to this work.

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Du, F., Hu, Z., Qin, L. et al. Suppression of carotenoid cleavage dioxygenase 1 (NtCCD1) increases carotenoid contents and attenuates reactive oxygen species (ROS) in Tobacco Leaves. Plant Growth Regul 100, 667–679 (2023). https://doi.org/10.1007/s10725-023-00961-x

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  • DOI: https://doi.org/10.1007/s10725-023-00961-x

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