Abstract
Powdery mildew, caused by Oidium heveae, is a major threat to rubber plantations worldwide. Population studies are scarce for this pathogen due to the lack of polymorphic molecular markers. In this study, sixteen polymorphic microsatellite loci were identified using DNA extracted from single lesions based on the whole-genome sequences of the pathogen. Primers of these loci were applied to 138 O. heveae samples from five counties in Hainan, China. The number of alleles per locus ranged from 2 to 11 and the gene diversity varied from 0.014 to 0.728. In total, 119 multilocus genotypes (MLGs) were observed for the 138 samples. However, only one sample was significantly distinct from the other samples base on DAPC analysis. Further study indicated that there were three subclusters for the other 137 samples, but no evidence for regional genotypic subdivision was identified. The microsatellite markers developed are very useful to study the genetic structure and the dispersal route of O. heveae, especially as it can use DNA extracted directly from infected leaves.
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Funding
This work was funded by the National Natural Science Foundation of China (31972212, 31701731) and Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Tropical Agricultural Sciences (No. 1630042017003). The authors have no conflict of interest to declare.
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Fig. S1
The genotype accumulation curve for 138 rubber tree powdery mildew samples from Hainan, China. The boxplots represent the range of MLG numbers observed for each random sample of loci. (PNG 616 kb)
Fig. S2
Discriminant analysis of principal components (DAPC) of the 137 rubber tree powdery mildew samples from Hainan, China. A, Value of Bayesian information criteria (BIC); B, Scatterplot of DAPC. (PNG 75.9 kb)
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Han, Q., He, Y., Che, H. et al. Development and characterization of microsatellite markers for the rubber tree powdery mildew pathogen Oidium heveae. Eur J Plant Pathol 164, 253–262 (2022). https://doi.org/10.1007/s10658-022-02555-1
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DOI: https://doi.org/10.1007/s10658-022-02555-1