Abstract
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A novel er1 allele, er1 -7, conferring pea powdery mildew resistance was characterized by a 10-bp deletion in PsMLO1 cDNA, and its functional marker was developed and validated in pea germplasms.
Abstract
Pea powdery mildew caused by Erysiphe pisi DC is a major disease worldwide. Pea cultivar ‘DDR-11’ is an elite germplasm resistant to E. pisi. To identify the gene conferring resistance in DDR-11, the susceptible Bawan 6 and resistant DDR-11 cultivars were crossed to produce F1, F2, and F2:3 populations. The phenotypic segregation patterns in the F2 and F2:3 populations fit the 3:1 (susceptible:resistant) and 1:2:1 (susceptible homozygotes:heterozygotes:resistant homozygotes) ratios, respectively, indicating that resistance was controlled by a single recessive gene. Analysis of er1-linked markers in the F2 population suggested that the recessive resistance gene in DDR-11 was an er1 allele, which was mapped between markers ScOPE16-1600 and c5DNAmet. To further characterize er1 allele, the cDNA sequences of PsMLO1 from the parents were obtained and a novel er1 allele in DDR-11 was identified and designated as er1-7, which has a 10-bp deletion in position 111–120. The er1-7 allele caused a frame-shift mutation, resulting in a premature termination of translation of PsMLO1 protein. A co-dominant functional marker specific for er1-7 was developed, InDel111–120, which co-segregated with E. pisi resistance in the mapping population. The marker was able to distinguish between pea germplasms with and without the er1-7. Of 161 pea germplasms tested by InDel111–120, seven were detected containing resistance allele er1-7, which was verified by sequencing their PsMLO1 cDNA. Here, a novel er1 allele was characterized and its an ideal functional marker was validated, providing valuable genetic information and a powerful tool for breeding pea resistance to powdery mildew.
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Acknowledgments
We sincerely thank Prof. Dongxu Xu (Zhangjiakou Academy of Agricultural Sciences) for providing the pea materials used in this study. This study was supported by the Modern Agro-industry Technology Research System (CARS-09) and the Crop Germplasm Conservation and Utilization Program (2014NWB030-14) from the Ministry of Agriculture of China and the Scientific Innovation Program of the Chinese Academy of Agricultural Sciences, and the Public Welfare Special Fund (1610092015002-01) from the Institute of Crop Science, Chinese Academy of Agricultural Sciences.
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Sun, S., Deng, D., Wang, Z. et al. A novel er1 allele and the development and validation of its functional marker for breeding pea (Pisum sativum L.) resistance to powdery mildew. Theor Appl Genet 129, 909–919 (2016). https://doi.org/10.1007/s00122-016-2671-9
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DOI: https://doi.org/10.1007/s00122-016-2671-9