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Identification of Genes Underlying the Resistance to Melampsora larici-populina in an R Gene Supercluster of the Populus deltoides Genome.
Wei, Suyun; Wu, Huaitong; Li, Xiaoping; Chen, Yingnan; Yang, Yonghua; Dai, Meili; Yin, Tongming.
Afiliação
  • Wei S; The Key Laboratory for Poplar Breeding and Germplasm Improvement, The Southern Modern Forestry Collaborative Innovation Center, College of Forestry, Nanjing Forestry University, Nanjing 210037, China.
  • Wu H; College of Information Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
  • Li X; The Key Laboratory for Poplar Breeding and Germplasm Improvement, The Southern Modern Forestry Collaborative Innovation Center, College of Forestry, Nanjing Forestry University, Nanjing 210037, China.
  • Chen Y; The Key Laboratory for Poplar Breeding and Germplasm Improvement, The Southern Modern Forestry Collaborative Innovation Center, College of Forestry, Nanjing Forestry University, Nanjing 210037, China.
  • Yang Y; The Key Laboratory for Poplar Breeding and Germplasm Improvement, The Southern Modern Forestry Collaborative Innovation Center, College of Forestry, Nanjing Forestry University, Nanjing 210037, China.
  • Dai M; College of Life Sciences, Nanjing University, Nanjing 210093, China.
  • Yin T; The Key Laboratory for Poplar Breeding and Germplasm Improvement, The Southern Modern Forestry Collaborative Innovation Center, College of Forestry, Nanjing Forestry University, Nanjing 210037, China.
Plant Dis ; 104(4): 1133-1143, 2020 Apr.
Article em En | MEDLINE | ID: mdl-32049587
Identification of the particular genes in an R genes supercluster underlying resistance to the rust fungus Melampsora larici-populina in poplar genome remains challenging. Based on the de novo assembly of the Populus deltoides genome, all of the detected major genetic loci conferring resistance to M. larici-populina were confined to a 3.5-Mb region on chromosome 19. The transcriptomes of the resistant and susceptible genotypes were sequenced for a timespan from 0 to 168 hours postinoculation. By mapping the differentially expressed genes to the target genomic region, we identified two constitutive expression R genes and one inducible expression R gene that might confer resistance to M. larici-populina. Nucleotide variations were predicted based on the reconstructed haplotypes for each allele of the candidate genes. We also confirmed that salicylic acid was the phytohormone mediating signal transduction pathways, and PR-1 was identified as a key gene inhibiting rust reproduction. Finally, quantitative reverse transcription PCR assay revealed consistent expressions with the RNA-sequencing data for the detected key genes. This study presents an efficient approach for the identification of particular genes underlying phenotype of interest by the combination of genetic mapping, transcriptome profiling, and candidate gene sequences dissection. The identified key genes would be useful for host resistance diagnosis and for molecular breeding of elite poplar cultivars exhibiting resistance to M. larici-populina infection. The detected R genes are also valuable for testing whether the combination of individual R genes can induce durable quantitative resistance.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Basidiomycota / Populus Tipo de estudo: Diagnostic_studies Idioma: En Ano de publicação: 2020 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Basidiomycota / Populus Tipo de estudo: Diagnostic_studies Idioma: En Ano de publicação: 2020 Tipo de documento: Article