The SAUR (small auxin-up RNA) family constitutes a category of genes that promptly respond to the hormone auxin and play a pivotal role in diverse biological processes encompassing plant growth and the response to abiotic stress.
Santalum album L., a semi-parasitic evergreen tree,
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The SAUR (small auxin-up RNA) family constitutes a category of genes that promptly respond to the hormone auxin and play a pivotal role in diverse biological processes encompassing plant growth and the response to abiotic stress.
Santalum album L., a semi-parasitic evergreen tree, is renowned for its economically valuable essential oils, positioning it among the most prized tree species. In this study, a meticulous identification and comprehensive analysis of 43
SAUR genes was conducted within
S. album. Based on phylogenetic relationships, the
SaSAUR genes were systematically categorized into five groups. A collinearity analysis revealed intriguing insights, disclosing 14 segmental duplications and 9 tandem duplications within the
SaSAUR genes, emphasizing the pivotal role of duplication in the expansion of this gene family. Noteworthy variations in the expression levels of
SaSAUR genes were observed by delving into the
SaSAUR transcriptome data from various tissues, including leaves, roots, and heartwood, as well as under salt-stress conditions. Notably,
SaSAUR08 and
SaSAUR13 were significantly upregulated in heartwood compared with roots and leaves, while
SaSAUR18 was markedly more expressed in roots compared with heartwood and leaves. Furthermore,
SaSAUR27 and
SaSAUR28 were found to respond closely to salt stress, hinting at their potential involvement in the salt-stress response mechanism. This research offers a comprehensive investigation of
SAUR genes in
S. album and establishes a foundation for future exploration of the
SAUR gene family, particularly its relation to growth and salt-stress responses.
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