组蛋白去乙酰化酶参与ERF转录因子调控的香蕉果实成熟机制研究
[Abstract]:Bananas are respiratory climacteric fruits, and the fruits are rapidly softened after they are started. Many studies have shown that ERF transcription factors and histone deacetylase (HDAC) play an important role in the growth and development of plants. Our previous studies have shown that MaERFs, which is closely related to maturity, can not only be used for feedback. Regulate the ethylene synthesis gene MaACS1 and MaACO1, and interact with MaACO1 protein to participate in the transcriptional regulation of banana fruit ripening. However, it is not clear whether HDAC participates in and how to participate in ERF regulation of banana fruit ripening. EMSA, double luciferase reporter gene experiment (DLR), protein interaction technique and chromatin immunoprecipitation (ChIP) were used to study the mechanism of HDAC participation in the regulation of banana fruit ripening. Our results widened the transcriptional regulation network of fruit ripening, especially in histone deacetylation repair. The main research results and conclusions obtained in this paper are as follows: 1.MaERF11 has the transcriptional inhibitory activity, which can combine the MaACO1 of ethylene synthesis gene and the promoter of 3 fruit softening related genes MaEXP2/7/8, and then participate in the regulation of banana fruit. The actual maturation process.EMSA and ChIP experiments showed that MaERF11 could combine the ethylene synthesis gene MaACO1 and the promoter of 3 fruit softening related genes MaEXP2/7/8. In addition, DLR tests showed that MaERF11 had transcriptional inhibitory activity and could inhibit the activity of the promoter of the downstream gene MaACO1 and MaEXP2/7/8. These results suggest that MaERF11 is transcribed as a transcript. Suppressor, the expression of ethylene synthesis and fruit softening.2. maturity related genes MaACO1 and MaEXP2/7/8 can be regulated by the inhibition of ethylene synthesis gene MaACO1 and fruit softening related gene MaEXP2/7/8, and the changes in histone acetylation level are closely related to fruit maturity. Fluorescence quantitative PCR (qRT-PCR) results show that MaACO1 The expression of MaEXP2/7/8 gene in the post harvest banana ripening process showed an increasing trend in the process of post harvest banana ripening..ChIP results showed that the levels of histone H3 and H4 on the MaACO1 and MaEXP2/7/8 chromatin of mature banana fruit were higher than those of immature bananas, which coincided with the trend of gene expression. These results indicate that MaACO1 The expression of MaEXP2/7/8 and its chromatin histone acetylation level are closely related to the ripening of banana fruit..3.MaERF11 is used to form a transcriptional inhibition complex by recruiting MaHDA1 to regulate the transcriptional expression of MaACO1 and MaEXP2/7/8. Yeast two hybrid (Y2H), bimolecular fluorescence complementation (BiFC) and immunoprecipitation (Co-IP) result in MaERF There is a interaction between 11 and MaHDA1, and MaHDA1 has the HDAC conserved domain and histone deacetylase activity, which can enhance the inhibitory effect of MaERF11 on the downstream target gene MaACO1 and MaEXP2/7/8. These results show that MaERF11 and MaHDA1 can form a transcriptional inhibition complex and jointly regulate the back ripening related genes MaACO1 and MaEXP. The expression of 2/7/8, thus participating in the regulation of banana fruit ripening and senescence,.4. obtained 17 MaHDACs genes from the banana genome sequence, which can be divided into three different subgroups of RPD3/HDA1, HD2 and SIR2, and they present different expression patterns in the process of banana fruit ripening. We identified 17 MaHDACs genes from the banana genome. Through the evolutionary tree relationship and the conservative domain analysis of amino acid sequences, it is found that the MaHDA1-12 encoded amino acid sequences all contain a HDAC conservative domain, belonging to the RPD3/HDA1 subfamily, and the MaHDT1-3 encoded amino acid sequence has a MEFWG conservative domain at the N end, which belongs to the HD2 subfamily; and MaSRT1/2 encoded amino acid sequences have a SIR sequence. The 2 conservative domain, belonging to the.QRT-PCR analysis of the SIR2 subfamily, showed that 17 MaHDACs showed different expression patterns in the ripening process of banana fruit, in which the expression of MaHDA6 was most obvious, and all of the three different treated banana fruits showed obvious up-regulated.5., which discussed MaHDA6 in ethylene signal transduction and fruit formation. The study shows that MaHDA6 is located in the nucleus and has the histone deacetylase activity. The results of ChIP show that MaHDA6 can combine the promoter of MaERF11/15, and the level of the histone acetylation of the MaERF11/15 gene of the mature banana fruit is lower than that of the immature banana, which is in accordance with their expression. These results suggest that MaHDA6 may be used to regulate the expression of the downstream gene MaERF11/15 by deacetylation, thus participating in the regulation of ethylene signal transduction pathway and the ripening senescence of banana fruit.
【学位授予单位】:华南农业大学
【学位级别】:博士
【学位授予年份】:2016
【分类号】:S668.1
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