摘要
Abscission,a cell separation process,is an important trait that in fluences grain and fruit yield.We previously reported that BEL1-LIKE HOMEODOMAIN 4(SIBL4)is involved in chloroplast development and cell wall metabolism in tomato fruit.In the present study,we showed that silencing SIBL4 resulted in the enlargement and pre-abscission of the tomato(Solanum lycopersicum cv.Micro-TOM)fruit pedicel.The anatomic analysis showed the presence of more epidermal cell layers and no obvious abscission zone(AZ)in the SlBL4 RNAi lines compared with the wild-type plants.RNA-seq analysis indicated that the regulation of abscission by SlBL4 was associated with the altered abundance of genes related to key meristems,auxin transporters,signaling components,and cell wall metabolism.Furthermore,SlBL4 positively affected the auxin concentration in the abscission zone.A dual-luciferase reporter assay revealed that SlBL4 activated the transcription of the JOINTLESS,OVATE,PIN1,and LAX3 genes.We reported a novel function ofSlBL4,which plays key roles in fruit pedicel organogenesis and abscission in tomatoes.
基金
the National Natural Science Foundation of China(31601763 and 31972470)
the Inner Mon golia Univer sity High-Level Tale nt Research Program(12000-15031934).
