Comparative phylogenetic analysis of the mediator complex subunit in asparagus bean (Vigna unguiculata ssp. sesquipedialis) and its expression profile under cold stress

• Published in: BMC genomics Vol. 25; no. 1; p. 149
• Main Authors: Liang, Le, Wang, Dong, Xu, Dongmei, Xiao, Jiachang, Tang, Wen, Song, Xueping, Yu, Guofeng, Liang, Zongxu, Xie, Minghui, Xu, Zeping, Sun, Bo, Tang, Yi, Huang, Zhi, Lai, Yunsong, Li, Huanxiu
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 06.02.2024; BioMed Central; BMC
• Subjects: Abiotic stress; Agricultural research; Arabidopsis thaliana; Asparagus; Beans; Bivariate correlation; Cold; Cold-Shock Response; Comparative analysis; Cowpea; Cowpeas; Cultivars; Defense; Evolution & development; Fabaceae - genetics; Gene expression; Gene sequencing; Genes; Genetic aspects; Genetic transcription; Genomes; Genomics; Hardiness; Kinases; Mediator Complex - genetics; Mediator complex subunit; Molecular weight; Nature conservation; PCA; Phylogenetics; Phylogeny; Physiological aspects; Plant growth; Plants; Proteins; Recovery; RNA polymerase; Seeds; Selection pressure; Soybean; Soybeans; Species diversity; Structural variation; Temperature; Tomatoes; Transcription factors; Vegetables; Vigna - genetics; Vigna unguiculata; China; Mediator complex subunit; Selection pressure; Bivariate correlation; Recovery; Structural variation; PCA
• ISSN: 1471-2164; 1471-2164
• DOI: 10.1186/s12864-024-10060-4

The mediator complex subunits (MED) constitutes a multiprotein complex, with each subunit intricately involved in crucial aspects of plant growth, development, and responses to stress. Nevertheless, scant reports pertain to the VunMED gene within the context of asparagus bean (Vigna unguiculata ssp. sesquipedialis). Establishing the identification and exploring the responsiveness of VunMED to cold stress forms a robust foundation for the cultivation of cold-tolerant asparagus bean cultivars. Within this study, a comprehensive genome-wide identification of VunMED genes was executed in the asparagus bean cultivar 'Ningjiang3', resulting in the discovery of 36 distinct VunMED genes. A phylogenetic analysis encompassing 232 MED genes from diverse species, including Arabidopsis, tomatoes, soybeans, mung beans, cowpeas, and asparagus beans, underscored the highly conserved nature of MED gene sequences. Throughout evolutionary processes, each VunMED gene underwent purification and neutral selection, with the exception of VunMED19a. Notably, VunMED9/10b/12/13/17/23 exhibited structural variations discernible across four cowpea species. Divergent patterns of temporal and spatial expression were evident among VunMED genes, with a prominent role attributed to most genes during early fruit development. Additionally, an analysis of promoter cis-acting elements was performed, followed by qRT-PCR assessments on roots, stems, and leaves to gauge relative expression after exposure to cold stress and subsequent recovery. Both treatments induced transcriptional alterations in VunMED genes, with particularly pronounced effects observed in root-based genes following cold stress. Elucidating the interrelationships between subunits involved a preliminary understanding facilitated by correlation and principal component analyses. This study elucidates the pivotal contribution of VunMED genes to the growth, development, and response to cold stress in asparagus beans. Furthermore, it offers a valuable point of reference regarding the individual roles of MED subunits.