基于RNA-seq進行小桐子在干旱脅迫響應與適應過程中的轉錄組分析及其關鍵基因的克隆和功能驗證
[Abstract]:Jatropha curcas L. is an energy plant species with great potential for development. Drought is an important environmental factor limiting the development of Jatropha curcas L. industry. The transcriptomes of Jatropha curcas during simulated drought training and air stress were analyzed by using Illumina Hiseq 2000 high-throughput sequencing system. The transcriptome response panorama of Jatropha curcas during drought response and adaptation was clarified by identifying differentially expressed genes and their functional enrichment analysis. Two differentially expressed key genes related to drought resistance were cloned and obtained, which provided a solid theoretical and experimental basis for revealing the molecular mechanism of drought resistance formation under drought stress and for subsequent improvement of Jatropha curcas L. by genetic engineering. The results were as follows: 1. After 48 hours of simulated drought stress (5 sampling points: 0 h, 6 h, 12 h, 24 h, 48 h), 3 sampling points (24 h, 48 h, 72 h) were set up. The seedlings without drought stress were sampled for 72 h and after the stress was over. Each leaf sample was taken from 5 independent plants and mixed evenly. After removing low-quality reads, the average number of clean reads per cDNA library was 11,933,126. By comparing with the reference genome and multiple databases, a total of 26,979 functional annotations were obtained. At the stage of drought training, 27,67,74,186 genes were down-regulated and 36,76,122,166 genes were up-regulated respectively at 6,12,24 and 48 hours of exercise, compared with the control at 0 H. At the following 24,48,72 hours of air drought stress, the down-regulated gene number was 671,742,696, and 411,409,375 genes were up-regulated. 573 drought-responsive genes, of which the up-regulated genes mainly involved a large number of osmotic regulatory proteins, hormone biosynthesis, antioxidant system, transcription factors and so on. In addition, exercise-induced genes are involved in the biosynthesis of osmotic regulators (such as galactose, trehalose, betaine, etc.) and stress-resistant proteins (such as nsLTPs, HSPs, etc.). Activation of oxidative systems (such as GST, GPX, SOD, Oxoredoxin and metallothionein, etc.), biosynthesis of fatty acids (CER, WSD, GPAT, FAD, cytochrome P450, etc.), and metabolism and transformation of carbohydrates (such as RuBisco, PGK, etc.). 4. To verify the reliability of RNA-seq data, we selected 22 genes for qRT-PCR analysis, and the expression level of selected genes. The results showed that the average correlation coefficient between qPCR data and RNA-seq data was above 0.8, indicating that the RNA-seq data was reliable. 5. LEA proteins were a class of proteins closely related to stress resistance and were found in a large number of different species. The background expression of XM_0122372.1 in leaves was the highest and varied significantly after drought induction. On this basis, we selected the LEA protein for gene cloning and functional verification. Sequence analysis showed that the CDS sequence of the gene was 459 bp, encoding a protein of 152 amino acids, and was sequenced by specific sequence and homology. The sequence comparison showed that it belonged to the fourth group of typical hydrophilic LEA proteins, so it was named JcLEA4. Real-time fluorescence quantitative PCR analysis showed that the gene was significantly induced by air drought stress and ABA in the leaves of Jatropha curcas seedlings, and its heterologous expression enhanced the tolerance of yeast to PEG simulated drought stress. 6. GDSL esterase / lipase (GDSL es) Terase / lipase is a member of the lipase subfamily with a conserved domain of GDSL. Based on RNA-seq analysis, we cloned a gene JcGLIP encoding GDSL esterase / lipase from Jatropha curcas seedlings. The gene JcGLIP was identified as a member of the SGNH hydrolase superfamily / subfamily and CDS sequence by conserved domain analysis. The total length was 1,104 BP and the coding protein contained 367 amino acids. The results of fluorescence quantitative PCR showed that JcLEA4 and JcGLIP genes were induced in large quantities at the early stage of air drought stress and ABA treatment, and they belonged to drought fast response genes. Transgenic yeasts also showed resistance to PEG simulated drought stress. The drought response of Jatropha curcas L. is related to this process, and this process may be related to ABA signal regulation.
【學位授予單位】:云南師范大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:Q943.2;S794.9
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