The Asteraceae are widely distributed throughout the world, with diverse functions and large genomes. Many of these genes remain undiscovered and unstudied. In this study, we discovered a new gene
ClNUM1 in
Chrysanthemum lavandulifolium and studied its function. In this study, bioinformatics, RT-qPCR,
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The Asteraceae are widely distributed throughout the world, with diverse functions and large genomes. Many of these genes remain undiscovered and unstudied. In this study, we discovered a new gene
ClNUM1 in
Chrysanthemum lavandulifolium and studied its function. In this study, bioinformatics, RT-qPCR, paraffin sectioning, and tobacco transgenics were utilized to bioinformatically analyze and functionally study the three variable splice variants of the unknown gene
ClNUM1 cloned from
C. lavandulifolium. The results showed that
ClNUM1.1 and
ClNUM1.2 had selective 3′ splicing and selective 5′ splicing, and
ClNUM1.3 had selective 5′ splicing. When the corresponding transgenic tobacco plants were subjected to abiotic stress treatment, in the tobacco seedlings, the
ClNUM1.1 gene and the
ClNUM1.2 gene enhanced salt and low-temperature tolerance and the
ClNUM1.3 gene enhanced low-temperature tolerance; in mature tobacco plants, the
ClNUM1.1 gene was able to enhance salt and low-temperature tolerance, and the
ClNUM1.2 and
ClNUM1.3 genes were able to enhance low-temperature tolerance. In summary, there are differences in the functions of the different splice variants and the different seedling stages of transgenic tobacco, but all of them enhanced the resistance of tobacco to a certain extent. The analysis and functional characterization of the
ClNUM1 gene provided new potential genes and research directions for abiotic resistance breeding in
Chrysanthemum.
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