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Genome-wide analysis of the SPL transcription factor family and its response to water stress in sunflower (Helianthus annuus).
Cell Stress & Chaperones 2023 November 9
SPL (SQUAMOSA promoter binding proteins-like) are plant-specific transcription factors that play essential roles in a variety of developmental processes as well as the ability to withstand biotic and abiotic stresses. To date, numerous species have been investigated for the SPL gene family, but so far, no SPL family genes have been thoroughly identified and characterized in the sunflower (Helianthus annuus). In this study, 25 SPL genes were identified in the sunflower genome and were unevenly distributed on 11 chromosomes. According to phylogeny analysis, 59 SPL genes from H. annuus, O. sativa, and A. thaliana were clustered into seven groups. Furthermore, the SPL genes in groups-I and II were demonstrated to be potential targets of miR156. Synteny analysis showed that 7 paralogous gene pairs exist in HaSPL genes and 26 orthologous gene pairs exist between sunflower and rice, whereas 21 orthologous gene pairs were found between sunflower and Arabidopsis. Segmental duplication appears to have played a vital role in the expansion processes of sunflower SPL genes, and because of selection pressure, all duplicated genes have undergone purifying selection. Tissue-specific gene expression analysis of the HaSBP genes proved their diverse spatiotemporal expression patterns, which were predominantly expressed in floral organs and differentially expressed in stem, axil, and root tissues. The expression pattern of HaSPL genes under water stress showed broad involvement of HaSPLs in the response to flood and drought stresses. This genome-wide identification investigation provides detailed information on the sunflower SPL transcription factor gene family and establishes a strong platform for future research on sunflower responses to abiotic stress tolerance.
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