The polysaccharides in Auricularia heimuer are bioactive molecules with medicinal value.However,the molecular mechanism of the synthesis of polysaccharides in A.heimuer has not yet been clarified.This study identified UGP family genes at key positions in the polysaccharide synthesis pathway.Two AhUGPs genes were identified from the A.heimuer genome,and 39 UGPs genes were unearthed from another 21 edible fungus genomes through bioinformatics analysis.It was found that the members of the UGP gene family were highly conserved in fungi.The number of members was small but they still played an important role.The four UGPs of the genus Auricularia showed higher conservation.In the analysis of the promoter region of AhUGPs,more light-responsive elements and phytohormone-responsive elements were found,indicating that AhUGPs were more susceptible to light and hormone regulation.In the characterization of AhUGPs,it was found that the expression level of AhUGP1 was significantly related to mycelial growth rate,mycelial biomass,and polysaccha-ride content.Compared with AhUGP2,AhUGP1 was more important in hyphal growth and polysac-charide synthesis.
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