호박 유전자원의 흰가루병 저항성 평가

Powdery mildew is one of the important diseases occurred in Cucurbitaceae. Screening of pumpkin germplasm for powdery mildew resistance is the best way in developing new variety to prevent or reduce the occurrence of this disease. This study was conducted to identify the resistance accessions of pumpkin germplasm in the National Agrobiodiversity Center of RDA. Identification of powdery mildew resistant germplasm was conducted after inoculate with infected pumpkin leaves in powdery mildew for two hundred forty-eight accessioins of pumpkin germplasm. Degree of disease resistant was evaluated one month after inoculation under greenhouse conditions. Out of two hundred forty-eight accessions of pumpkin germplasm, three accessions of Cucurbita maxima and one accession of Cucurbita moschata were recognized as resistant germplasm to powdery mildew. Five accessions were moderate resistant. The resistance levels of powdery mildew were positively correlated with the thickness of epidermal cell wall and cuticle layer in Cucurbita maxima and Cucurbita moschata. The thickness of epidermal cell wall and cuticle layer may play a role to prevent infection of powdery mildew. Four resistant germplasm can be used as breeding resources for the powdery mildew resistance.