Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 23, Issue 13, Pages -Publisher
MDPI
DOI: 10.3390/ijms23137082
Keywords
reactive oxygen species; abiotic; expression profiles; subcellular localization; phylogenetic relationship
Funding
- National Key Research and Development Program of China [2018YFD1000800, 2017YFE0114500]
- Natural Science Foundation of Jiangsu Province [BK20190958]
- Natural Science Research Project of Jiangsu Higher Education Institutions [19KJB210001]
- China Agriculture Research System of MOF and MARA [CARS-23-G-44]
- NationaNatural Science Foundation of China [31772294]
- Zhejiang Provincial Major Agricultural Science and Technology Projects of New Varieties Breeding [2016C02051]
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The study comprehensively analyzed the Cu/Zn SOD gene family in different plant species, revealing two subfamilies and the evolution of multiple gene copies within one of the subfamilies.
Superoxide dismutases (SODs), a family of antioxidant enzymes, are the first line of defense against oxidative damage and are ubiquitous in every cell of all plant types. The Cu/Zn SOD, one of three types of SODs present in plant species, is involved in many of the biological functions of plants in response to abiotic and biotic stresses. Here, we carried out a comprehensive analysis of the Cu/Zn SOD gene family in different plant species, ranging from lower plants to higher plants, and further investigated their organization, sequence features, and expression patterns in response to biotic and abiotic stresses. Our results show that plant Cu/Zn SODs can be divided into two subfamilies (group I and group II). Group II appeared to be conserved only as single- or low-copy genes in all lineages, whereas group I genes underwent at least two duplication events, resulting in multiple gene copies and forming three different subgroups (group Ia, group Ib, and group Ic). We also found that, among these genes, two important events-the loss of introns and the loss of and variation in signal peptides-occurred over the long course of their evolution, indicating that they were involved in shifts in subcellular localization from the chloroplast to cytosol or peroxisome and underwent functional divergence. In addition, expression patterns of Cu/Zn SOD genes from Arabidopsis thaliana and Solanum lycopersicum were tested in different tissues/organs and developmental stages and under different abiotic stresses. The results indicate that the Cu/Zn SOD gene family possesses potential functional divergence and may play vital roles in ROS scavenging in response to various stresses in plants. This study will help establish a foundation for further understanding these genes' function during stress responses.
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