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Pepper mild mottle virus (PMMoV) is one of the most serious pathogens worldwide. Currently, five pathogenic types of PMMoV have been reported, including P0, P1, P1,2, P1,2,3 and P1,2,3,4. The wide host range and strong pathogenicity of PMMoV seriously affect the yield and quality of pepper, and breeding for disease resistance is the most economical and effective means to control this virus. Our previous study determined that PMMoV infected with Danzhou pepper germplasm nursery in Hainan is the P1,2 pathogenic type. In order to screen PMMoV-resistant pepper germplasm resources, 110 germplasms were tested for PMMoV resistance using the reported L3-linked molecular markers. 46 pepper germplasms containing molecular markers of resistance were inoculated with PMMoV P1,2 pathogenic type by inoculation at seeding stage. Local symptoms were investigated 5 d after inoculation, and systemic symptoms were investigated 20 d after inoculation, and disease indices were calculated. The results showed that there were sig-nificant differences in disease resistance among different pepper germplasms, and the disease indexes of various germplasms ranged from 8.86-60.00. The germplasms showing high resistance (HR) to PMMoV P1,2 pathogenic type were CF19-34m and 19FB6-1. The germplasms showing resistance (R) wasCCJ93-1. The germplasms showing medium-resistance (MR) included 17YB32, 17SCa28m, 15SM39-2, 14SM555×14SM1, 14SM567-2, 14SM526-1, 14SM565-1, 14SM502-1, 14SM519-1, 14SM504m, 14SM503m, 14SM519-3, 14SM518-2, 14SM519-2, CCJ52-1, etc. The presenting susceptible (S) germplasms were 14SM514m, CCJ22-1, CCJ113-2, CCJ135-1, CCJ157-1, L537-1m, L545, CCJ87-2 and CCJ133-1, and the obtained disease-resistant germplasms accounted for 80.43% of the total identified materials. The results of this study would lay the foundation for creating germplasm resources resistant to pepper mild mottle virus and breeding resistant varieties.
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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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