高溫脅迫對西花薊馬抗氧化酶活性的影響及CAT基因的克隆與表達(dá)
[Abstract]:Western flower thrips are worldwide pests that harm horticultural and cash crops. The insect was first discovered in Beijing in 2003 and quickly spread to most parts of China. Western flower thrips are often subjected to high temperature stress in summer during invasion, but this does not limit the rapid expansion of their populations. In this paper, physiological and biochemical methods and molecular biology methods were used to analyze the role of antioxidant enzyme system under high temperature stress, in order to understand the tolerance mechanism of thrips to high temperature stress, and to provide a theoretical basis for the study of population diffusion of thrips westerners. The main findings are as follows: 1. The effects of high temperature stress on antioxidant enzyme activity of thrips were studied. The results showed that the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (catalase) were significantly increased and then decreased after being exposed to 0.5, 1 and 2 h high temperature stress in thrips. The activity of glutathione-S-transferase (GSH-S-transferase) increased significantly under 0.5 h high temperature stress, but not under 1 and 2 h high temperature stress. The results show that the antioxidant enzyme system of thrips can effectively resist oxidative damage caused by high temperature stress. 2. Seven fragments of the internal reference gene of thrips were cloned by RT-PCR technique, including 18s rRNA, EF 1, GAPDH,H3,TUB,ACT and RPL32.. The stability of seven internal reference genes of thrips japonicus under different experimental conditions was studied by means of qRT-PCT technique. The internal reference genes were ranked by the commonly used internal reference gene screening program (NormFinder,geNorm and BestKeeper) and the comparison of 螖 Ct method. Finally, the RefFinder web program was used for comprehensive evaluation, and the best internal reference gene scheme was obtained. The most suitable internal reference gene combinations were as follows: EF-1 and RPL32; high temperature stress was RPL32 and GAPDH; low temperature stress was 18s and EF-1; low temperature time gradient was TUB and GAPDH; low temperature time gradient was EF-1 and TUB.. Finally, the screening of internal reference genes was verified, indicating that the screening of internal reference genes is very necessary for the standardization of quantitative study of target genes. 3. The catalase gene was cloned from thistle by RT-PCR and RACE and named FoCAT.. The full-length cDNA of FoCAT is 1870bp, the open reading frame is 1521bp, encoding 506amino acids, and the predicted molecular weight is 57.11kda. Sequence analysis showed that FoCAT was very conservative and had high similarity to CAT of other insects. FoCAT had two signature sequences of CAT family, which also indicated that FoCAT belonged to one of the CAT gene families. Real-time quantitative PCR was used to study the expression patterns of catalase gene in thistle at different developmental stages and at different temperatures. The results showed that high temperature stress could induce the expression of CAT, but the effect of low temperature stress on the expression of CAT was not significant, and the expression level of CAT in the second instar nymphs of thrips was significantly higher than that of other ages. The expression of CAT was up-regulated at different time gradients both at high temperature and low temperature, and reached the highest value at 2 h after treatment. In conclusion, the ability of thrips to tolerate high temperature stress is an important basis for its rapid invasion and diffusion, and its intrinsic mechanism may be related to the protection of antioxidant system from damage under high temperature stress.
【學(xué)位授予單位】:揚(yáng)州大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:S433.89
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