Project description:Fruit ripening in Citrus is not well understood at the molecular level. Knowledge of the regulatory mechanism of citrus fruit ripening at the post-transcriptional level in particular is lacking. Here, we comparatively analyzed the miRNAs and their targeted genes in a spontaneous late-ripening mutant, ?Fengwan? sweet orange (MT) (Citrus sinensis L. Osbeck), and its wild-type counterpart ('Fengjie 72-1', WT). Using high-throughput sequencing of small RNAs and RNA degradome tags, we identified 107 known and 21 novel miRNAs, as well as 225 target genes. A total of 24 miRNAs (16 known miRNAs and 8 novel miRNAs) were shown to be differentially expressed between MT and WT. The expression pattern of several key miRNAs and their target genes during citrus fruit development and ripening stages was examined. Csi-miR156k, csi-miR159 and csi-miR166d suppressed specific transcription factors (GAMYBs, SPLs and ATHBs) that are supposed to be important regulators involved in citrus fruit development and ripening. In the present study, miRNA-mediated silencing of target genes was found under complicated and sensitive regulation in citrus fruit. The identification of miRNAs and their target genes provide new clues for future investigation of mechanisms that regulate citrus fruit ripening.
Project description:An antifungal aroma substance, 2-phenylethanol (PEA), was isolated from antagonistic yeast strain Kloeckera apiculata extract. Microarry were used to analyse its role citrus. We used microarrays to detail the global programme of gene expression underlying Citrus were treated with 1.0x108 cells/ml K. apiculata (KA), PEA (0.15%), the extract (1000xdilute) and control (CK) for 24 h, An antifungal aroma substance, 2-phenylethanol, was isolated from antagonistic yeast strain Kloeckera apiculata. To analyse its role in Citrus response,Citrus were treated with K. apiculata , 2-phenylethano (0.15%), the extract (1000xdilute) and control (CK) for 24 h, respectively. The fresh epicarp of citrus was separated by knife and directly frozen in liquid nitrogen for RNA extraction and hybridization on Affymetrix microarrays.
Project description:An antifungal aroma substance, 2-phenylethanol (PEA), was isolated from antagonistic yeast strain Kloeckera apiculata extract. Microarry were used to analyse its role citrus. We used microarrays to detail the global programme of gene expression underlying Citrus were treated with 1.0x108 cells/ml K. apiculata (KA), PEA (0.15%), the extract (1000xdilute) and control (CK) for 24 h,
Project description:Seed developmental arrest is one of the early phenotypes of seed abortion. However, the molecular mechanism underlying seed developmental arrest of citrus is still unclear. In this study, laser capture microdissection (LCM) was used to accurately divide the seeds of seedless Ponkan ‘Huagan No.4’ (Citrus reticulata) (HG) and seeded Ponkan ‘Egan No.1’ (Citrus reticulata) (EG) into nucellus and integument/seed coat tissues. The captured tissues were used for subsequent RNA-seq. Moreover, single-molecule real-time (SMRT) sequencing was used to generate full-length transcripts of EG, which were used as reference transcripts for RNA-seq. These data can be utilized to analyse the causes of citrus seedlessness formation and the molecular regulatory network in the process of seed abortion.