Genome-Wide Identification and In Silico Expression Analysis of Gene Family in (Citrus) in Response to Abiotic Stress.

The (citrus) plant produces various phytohormones due to the significant involvement of the carotenoid cleavage oxygenase () gene family in its growth and development. genes can be divided into two main categories: (9-cis-epoxy carotenoid dioxygenase), responsible for abscisic acid (ABA) production, and (carotenoid cleavage dioxygenase), involved in pigment and strigolactone formation. To better understand the roles and positions of gene members in relation to these hormones, researchers analyzed the clementine genome. To identify their structural features, they employed phylogenetic analysis, protein interactions, localization, structure, miRNA targets, evolutionary analysis, and transcriptome studies. The study revealed the presence of 15 genes, including 11 and 4 genes, scattered across various chromosomes, with the majority located in chloroplasts. Promoter sequencing analysis indicated the presence of different cis-regulatory elements that likely interacted with phytohormones, such as auxin and abscisic acid among others. Notably, two genes, and , were significantly expressed among the genes, and these were found to be expressed during stress and played a crucial role in enabling optimal plant development. Furthermore, a comprehensive genome-wide comparison of genes in and models was conducted to understand their functional characteristics. This research provides a solid foundation for further exploration of the unique attributes of the plant, contributing to a deeper understanding of its growth and development processes.