Indole-3-acetic acid (IAA) is an important plant hormone required for various plant growth and developmental activities. YUCCA proteins are the enzymes for IAA synthesis that catalyze the rate-limiting step. However, the YUCCA gene family in Japanese apricot has not been thoroughly characterized. Here, we investigated the effect of rootstocks on scion growth of Japanease apricot and genes involved in auxin biosynthesis (YUCCA). Growth characteristics revealed that the height of ‘Longyan’ [Prunus mume Sieb. et Zucc] plants with P. mume rootstock were significantly shorter than ‘Longyan’ plants with P. persica rootstock. This study isolated 13 PmYUCCA genes from the Japanese apricot genome. Bioinformatics and expression studies were undertaken to investigate the functions and characteristics of YUCCA genes. The physicochemical properties, gene structure, conserved domains, conserved motif, and phylogenetic relationships of YUCCA genes were determined using bioinformatics analysis. Likewise, we analyzed the expression of PmYUCCA genes in Japanese apricot’s leaf and stem-bark (scion). The expression levels of PmYUCCA3 and PmYUCCA5 genes were noticeably lower in the leaves of ‘Longyan’/P. mume graft combination than that of the ‘Longyan’/P. persica graft combinations, suggesting their distinct roles in regulating growth vigor. This research explores the genome-wide identification, characterization, and possible relationship between growth vigor and expression profile analysis of the YUCCA gene family in Japanese apricot.

3-吲哚乙酸（IAA）是多种植物生长和发育活动所需的重要植物激素。YUCCA 蛋白是 IAA 合成的酶，可催化限速步骤。然而，日本杏中的YUCCA基因家族尚未得到彻底的表征。在这里，我们研究了砧木对日本杏接穗生长的影响以及参与生长素生物合成的基因（YUCCA）。生长特性揭示‘龙岩’的高度[ Prunus mume Sieb. et Zucc]具有梅花砧木的植物明显短于具有桃树砧木的“龙岩”植物。本研究分离出 13 PmYUCCA来自日本杏基因组的基因。通过生物信息学和表达研究来研究YUCCA基因的功能和特征。使用生物信息学分析确定YUCCA基因的理化特性、基因结构、保守结构域、保守基序和系统发育关系。同样，我们分析了日本杏叶和茎皮（接穗）中PmYUCCA基因的表达。‘龙岩’/梅花嫁接组合叶片中PmYUCCA3和PmYUCCA5基因的表达量显着低于‘龙岩’/桃花嫁接组合，表明它们在调节生长活力方面的独特作用。本研究探讨了日本杏YUCCA基因家族的全基因组鉴定、表征以及生长活力与表达谱分析之间可能的关系。