水稻品種抗稻瘟病等位基因鑒定及抗瘟新基因的定位和克隆
[Abstract]:Rice is the most important food crop in the world. In the production of rice, the occurrence of diseases is an important problem in the production of rice. Magnaporthe grisea, which is caused by Magnaporthe grisea, is one of the main diseases, and is widely used in various rice-producing areas in the world. It is a serious threat to rice yield and food security for many years. The production practice shows that the cultivation of durable resistant varieties is the primary measure of the prevention and control of the rice blast. The anti-blast genotypes of the rice varieties and their parents were identified, and the fine positioning, cloning and vector construction of the new gene Pi65 (t) of the rice variety were used to understand the distribution of the different disease-resistant genes in the variety. And provides a theoretical foundation for the breeding and the variety layout of the disease-resistant variety. In this paper,24 rice materials in Liaoning province were selected according to the allele-type identification of the rice blast resistance of the main rice varieties in Liaoning province, and the coding region sequences of each variety were amplified according to the conserved region design primers of 9 blast-resistant rice blast genes, and the amplicon sequences were compared and analyzed. The distribution of each gene in 24 varieties was identified, and the functional verification of some of the disease-resistant alleles was carried out. The results showed that Pid2, Pid3, Pita, Piz-t and Pil/ Piks/ Pikp/ Pikp appeared in 24 varieties with different mutation types and different frequencies, among which, Pid2, Pid3, Pita, Piz-t and Pil/ Piks/ Pik/ Pikp appeared in 24 varieties with different mutation types and different frequencies. The resistance allele of Pid2 and the disease-resistant allele of Pid3 were detected in two varieties. Four varieties of Pita's disease-resistant allele were detected, and several base mutations in Pita's allele did not affect the function of the disease-resistant gene. No sequence of Pik and its complex allele was found in all the varieties, but the identification of the rice blast fungus carrying the AVR-Pik showed that the Pik allele carried by the Liaoning and Shennong 265 may still have the disease-resistant gene function, and the alleles of the 19 Piz-t were detected in the variety. The results showed that most of the mutant sites had a loss of resistance to the allele of Piz-t. The rice blast population collected in Liaoning province was used for the fine positioning of the new gene Pi65 (t), which was collected in Liaoning province, and the resistance spectrum of 110 rice materials in Liaoning province was analyzed. The results showed that there were high anti-blast resistance (129) and high (LiaoXing 1) variety in the field for two consecutive years. Through the genotype identification analysis, no known disease-resistant gene is contained in the high-resistant variety. The candidate genes were further located between 30.42 and 30.98M by the SLLAF-seq technique, and the candidate genes were further located between 30.42 and 30.85 M. RT-PCR was used to analyze the difference of the expression of 4 genes between the port number 8 and the Liaoxing 1. The four genes may be related to the resistance of rice. The four genes are Os11g0691700, Os11g0691800, Os11g0691900 and Os11g0692100, all of which belong to NBS-LRR. Since the NBS-LRR class gene is a common type in the rice blast resistance gene, it is considered that these genes are most likely to be the new gene located in the port culture 129.3. The cloning and vector of the Pita, Pi9 new allele and the candidate gene Osllg0691700 are based on the results of the genotype identification, The Pi9 allele and the Pita allele carried by the rice variety, Liaonon 979, were all new disease-resistant alleles. The gene is cloned from two varieties, and the two genes are respectively connected to the expression vector, and one and a disease-related gene Pi65 (t) are positioned in the variety harbor culture 129 by using the SLAF-seq technique, and the gene is cloned and connected to the expression vector. The test results showed that Pi9, Pita and Pi65 (t) were successfully cloned and ligated to the expression vector.
【學(xué)位授予單位】:沈陽農(nóng)業(yè)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2015
【分類號】:S435.111.41
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