Tianxiao Lv, Qiongrui Liu, Hong Xiao, Tian Fan, Yuping Zhou, Jinxing Wang, Chang-En Tian

Front Plant Sci.; 2023 Jan 6; 13:1093589. doi: 10.3389/fpls.2022.1093589. 

Abstract

IQM, a plant-specific calmodulin-binding protein, plays multiple roles in plant growth and development. Although a comprehensive analysis has been carried out on the IQM family genes in Arabidopsis and rice, the number and functions of IQM genes in other species have not been explored. In this study, we identified 15 members of the soybean (Glycine max) IQM gene family using BLASTP tools. These members were distributed on 12 soybean chromosomes and constitute six pairs caused by fragment duplication events. According to phylogeny, the 15 genes were divided into three subfamilies (I, II, and III), and members of the same subfamily had similar gene and protein structures. Yeast two-hybrid experiments revealed that the IQ motif is critical for the binding of GmIQM proteins to GmCaM, and its function is conserved in soybean, Arabidopsis, and rice. Based on real-time PCR, the soybean IQM genes were strongly induced by PEG and NaCl, suggesting their important biological functions in abiotic stress responses. Overall, this genome-wide analysis of the soybean IQM gene family lays a solid theoretical foundation for further research on the functions of GmIQM genes and could serve as a reference for the improvement and breeding of soybean stress resistance traits.

See https://pubmed.ncbi.nlm.nih.gov/36684725/

Figure 4

Chromosomal locations and segmental duplication of soybean IQM genes.The fifteen IQM genes are widely mapped to 12 of the 20 chromosomes in soybean. Chromosome numbers are located at the top of each vertical bar. The duplicated paralogous pairs of GmIQM gene are connected with dotted lines of the same color. The colored boxes in front of the gene names represent different subfamilies (pink, subfamily I; green, subfamily II; orange, subfamily III). Scale on the left represents the chromosome length.