Glucose is vital to embryogenesis,as are glucose transporters.Glucose trans-porter 4(Glut4)is one of the glucose transporters,which is involved in rapid uptake of glucose by various cells and promotes glucose homeostasis.Although energy metabolism in insect reproduction is well known,the molecular mechanism of Glut4 in insect repro-duction is poorly understood.We suspect that Glut4 is involved in maintaining glucose concentrations in the ovaries and affecting vitellogenesis,which is critical for subsequent oocyte maturation and insect fertility.Harmonia axyridis(Pallas)is a model organism for genetic research and a natural enemy of insect pests.We studied the influence of the Glut4 gene on the reproduction and development of H.axyridis using RNA interference technol-ogy.Reverse transcription quantitative polymerase chain reaction analysis revealed that HaGlut4 was most highly expressed in adults.Knockdown of the HaGlut4 gene reduced the transcript levels of HaGlut4,and the weight and number of eggs produced significantly decreased.In addition,the transcript levels of vitellogenin receptor and vitellogenin in the fat bodies and the ovaries of H.axyridis decreased after the interference of Glut4,and decreased the triglyceride,fatty acid,total amino acid and adenosine triphosphate content of H.axyridis.This resulted in severe blockage of ovary development and reduction of yolk formation;there was no development of ovarioles in the developing oocytes.These changes indicate that a lack of HaGlut4 can impair ovarian development and oocyte mat-uration and result in decreased fecundity.

Yan Li;Sha-Sha Wang;Su Wang;Shi-Gui Wang;Bin Tang;Fang Liu

College of Horticulture and Plant Protection,Yangzhou University,Yangzhou,Jiangsu,225009,China;College of Life and Environmental Sciences,Hangzhou Normal University,Hangzhou,Zhejiang,310036,China;Institute of Plant and Environment Protection,Beijing Academy of Agricultural and Forestry Sciences,Beijing,100097,China

中国昆虫科学（英文版）

[1]Yan Li;Sha-Sha Wang;Su Wang;Shi-Gui Wang;Bin Tang;Fang Liu-.Involvement of glucose transporter 4 in ovarian development and reproductive maturation of Harmonia axyridis(Coleoptera:Coccinellidae))[J].中国昆虫科学（英文版）,2022(03):691-703

Coccinellidae,vitellogenesis,HaGlut4,ovarioles

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