Research in Plant Disease 2005;11(2):106-114.
Published online December 30, 2005.
흰가루병 저항성 동양종 호박 품종 육성
조명철, 엄영현, 김대현, 허윤찬, 김정수, 박효근
 
Breeding for Powdery Mildew Resistant Varieties in Cucurbita moschata
Myeong Cheoul Cho, Young Hyun Om, Dae Hyun Kim, Yun Chan Heo, Jeong Su Kim, Hyo Guen Park
Abstract
To breed powdery mildew resistant varieties, 104 accessions of Cucurbita spp. germplasm were evaluated. Powdery mildew resistance and horticultural characteristics of the accessions were investigated in the field conditions. C. martinezii was selected for high resistance to powdery mildew in the field. The growth of powdery mildew pathogen and response of leaf surface tissue to the pathogen were observed after artificial inoculation to resistant C. martinezii and susceptible C. moschata cv. ``Wonye No. 402``. Mycelium growth was very clearly different between resistant C. martinezii and susceptible C. moschata cv. ``Wonye No. 402`` at 5 days after inoculation at the adult stage. Interspecific hybridization was attempted to transfer powdery mildew resistance gene(s) from C. martinezii to C. moschata. A single dominant gene action was postulated as determining powdery mildew resistance at the seedling stage. But for the effective selection of powdery mildew resistant individuals, it was established that adult plant resistance should be confirmed in the field conditions after the seedling test. Through the seedling and field tests, C. moschata lines resistant to powdery mildew and superior to horticultural characteristics, were selected after 2 backcrossing and 3 selfing generations. The fruit characteristics of newly developed lines were similar to those of the recurrent parent, ``Jaechenjarae``.
Key Words: Cucurbita spp., Germplasm, Heritability, Interspecific hybrid, Powdery mildew resistant


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