PJB-2024-357
Identification and Analysis of SPX Gene Family Members from Genome‑wide of Solanum tuberosum and Insights into Their Potential Functions
Chunwei Li
Abstract
SPX family is one of the most important gene families, named for the presence of conserved Syg1/Pho81/XPR1 (SPX) domain, participating in phosphate ions (Pi) homeostasis and signaling transduction in plants. In this study, we identified 14 SPX family genes in Solanum tuberosum at the genome-wide level. These SPX family genes were located in 7 of the 12 chromosomes. Based on additional domains in the SPX family structure, the SPX family were classified into four SPX subfamilies, including SPX subfamily, SPX-ERD1/XPR1/SYG1(SPX-EXS) subfamily, SPX- SPX-Really Interesting New Gene (SPX-RING) subfamily, and a new SPX- EXS-a short C-terminal motif of D(N/H) (SPX- EXS-DNL) subfamily not been reported before. The majority of SPXs were localized in plasma membrane. Phylogenetic analysis of SPX family genes in Solanum tuberosum, Arabidopsis thaliana, Solanum lycopersicum, Oryza sativa, and Zea mays categorized these genes into 7 groups. The duplication events show that SPX genes in Solanum tuberosum were mainly produced by whole-genome duplication (WGD)/segmental duplications (SD). The synteny analysis revealed that the syntenic relationship of Solanum tuberosum SPX gene family was closer to the Solanum lycopersicum than those in Arabidopsis thaliana. The Solanum tuberosum SPX family genes displayed various expression patterns in tissues and had different degrees of response to biotic and abiotic stress. And all most Solanum tuberosum SPX family genes could interact and form an association network. Furthermore, one gene (PGSC0003DMG402022752) of the SPX subfamily genes showed the highest levels of expression in floral organs, and one member (PGSC0003DMG400017163) of the SPX- EXS subfamily was highly expressed under heat treatment (35°C), above results implies that the two genes might play a vital role for floral organs and heat stress (35°C), respectively. This study provides a basis for future elucidation of the functions of the Solanum tuberosum SPX family genes, especially in terms of phosphorus utilization.
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