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YUCCA is an important enzyme which catalyzes a key rate-limiting step in the tryptophan-dependent pathway for auxin biosynthesis and implicated in several processes during plant growth and development. Genome wide analyses of
YUCCA
genes have been performed in
Arabidopsis
, rice, tomato, and
Populus
, but have never been characterized in soybean, one of the most important oil crops in the world. In this study, 22
GmYUCCA
genes (
GmYUCCA1-22
) were identified and named based on soybean whole-genome sequence. Phylogenetic analysis of YUCCA proteins from
Glycine max, Arabidopsis, Oryza sativa
, tomato, and
Populus euphratica
revealed that GmYUCCA proteins could be divided into four subfamilies. Quantitative real-time RT-PCR (qRT-PCR) analysis showed that
GmYUCCA
genes have diverse expression patterns in different tissues and under various stress treatments. Compared to the wild type (WT), the transgenic
GmYUCCA5 Arabidopsis
plants displayed downward curling of the leaf blade margin, evident apical dominance, higher plant height, and shorter length of siliques. Our results provide a comprehensive analysis of the soybean
YUCCA
gene family and lay a solid foundation for further experiments in order to functionally characterize these gene members during soybean growth and development.