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| Identification and Bioinformatics Analysis of SAUR Gene Family in Melon（Cucumis melo L.） |
| JIAO Liping1，SI Xiuyang2，GUO Ziwen1，LI Pengfei1，LIU Dawei1* |
| （1College of Plant Protection，Northeast Agricultural University，Harbin 150030，Heilongjiang，China；2College of Agriculture and Biotechnology，Zhejiang University，Hangzhou 310058，Zhejiang，China） |
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Abstract Small auxin-up RNA（SAUR）gene family is the most important family of early auxin response genes in higher plants．We identified the SAUR family genes in melon，analyzed the gene structure，evolutionary relationship，gene duplication relationship，and gene tissue expression level using bioinformatics methods．The results showed that a total of 66 SAUR genes were identified in the melon genome，and the number of SAUR genes distributed on chromosomes 1 and 11 was much higher．Phylogenetic trees were constructed based on the full-length amino acid sequences of SAUR family genes in melon，Arabidopsis，watermelon，and cucumber by the maximum likelihood method，and SAUR genes can be classified into 5 groups．The SAUR genes of melon and Arabidopsis tended to be distributed in different branches on the evolutionary tree，while the SAUR genes of melon，watermelon and cucumber tended to cluster together．A total of 6 tandem duplication events and 11 segmental duplication gene pairs were identified．In addition，13 genes could form gene pairs in all six species．Eight cis-acting elements were related to abiotic and biotic stress responses，10 cis-acting elements were related to plant hormone responses，and 8 cis-acting elements were related to plant growth and development．The expression levels of melon SAUR family genes were different in different tissues and developmental stages of melon．
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Received: 11 November 2022
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