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Guangdong and Guangxi are the major production regions of pitaya and the common area for pitaya canker. Understanding the genetic diversity of Neoscytalidium dimidiatum is of great significance for the disease prevention and control. This research focused on four geographical population of N. dimidiatum mainly collected from Guangxi and Guangdong. To obtain the genetic fingerprints of N. dimidiatum, the isolates were amplified using ISSR genetic molecular markers and further analyzed the genetic diversity. The tested N. dimidiatum isolates were amplified with eight ISSR primers, resulting in 203 bands and the percentage of polymorphic sites was 31.7%, with the genetic similarity coefficient for any two germplasm resources ranged from 0.7619-1.0000. When the genetic similarity coefficient was 0.90 on the UPGMA cluster, all isolates could be divided into three groups, but the genetic groups were not closely related to the geographical distribution. The results of principal component analysis indicated considerable overlap between the four geographical groups and there were no relatively independent geographical poputation. This study proved that there existed lower level of genetic polymorphism in the isolates and there was frequent exchange of inoculum source between different places. The study would provide the scientific basis for researching the genetic architecture and pathogen surveillance of pitaya canker pathogen N. dimidiatum.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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