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Abstract
SBP-box is an important plant-specific transcription factor family and is involved in diverse biological processes. Here, we identified a total of 15 SBP-BOX genes in the important fruit crop sweet orange (Citrus sinensis) and characterized their gene structures, conserved domain and motif, chromosomal location, and cis-acting regulatory elements. SBP genes were classified into four subfamilies based on the amino acid sequence homology, and the classification is equally strongly supported by the gene and protein structures. Our analysis revealed that segmental duplication events were the main driving force in the evolution of CsSBP genes, and gene pairs might undergo extensive purifying selection. Further synteny analysis of the SBP members among sweet orange and other plant species provides valuable information for clarifying the CsSBP family evolutionary relationship. According to publicly available RNA-seq data and qRT-PCR analysis from various sweet orange tissues, CsSBP genes may be expressed in different tissues and developmental stages. Gene expression analysis showed variable expression profiles of CsSBP genes under various abiotic stresses, such as high and low-temperature, salt, and wound treatments, demonstrating the potential role of SBP members in sweet orange response to abiotic stress. Noticeably, all CsSBP genes were also downregulated in sweet orange upon the infection of an important fungal pathogen Diaporthe citri. Our results provide valuable information for exploring the role of SBP-Box in sweet orange.
Highlights
Sweet orange (Citrus sinensis) is one of the most popular and nutritive fruits in which the total global production of oranges can be up to 78.7 million tons (Food and Agriculture Organization of the United Nations, 2019)
We present genome-wide identification and characterization of CsSBP genes in the sweet orange genome
A total of 15 CsSBP genes phylogenetically divided into 4 subfamilies, which was further supported by the results of conserved domain and motif composition and gene structure
Summary
Sweet orange (Citrus sinensis) is one of the most popular and nutritive fruits in which the total global production of oranges can be up to 78.7 million tons (Food and Agriculture Organization of the United Nations, 2019). Citrus plants have acquired exquisite adaptive strategies to cope with geomorphological, climatic, and other cultivation factors. Various biotic and abiotic stresses still caused high loss rates. Melanose disease, caused by the Diaporthe citri, is a severe fungus disease and can infect all citrus cultivars, accompanied by degrading tastiness and appearance [1]. With the continuous progress of modern biotechnology, especially in recent decades, molecular breeding technology has gradually matured. Molecular breeding technology has the advantages of high efficiency, short period, and trait directional improvement [2]. Mining disease resistance and stress tolerance-related transcription factor gene have received increasing attention
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