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Two species of penicillium associated with blue mold of yam in Korea.

Kim WK, Hwang YS, Yu SH - Mycobiology (2008)

Bottom Line: During 2007 survey of post-harvest diseases of yam performed in May and June, severe tuber loss caused by blue mold was observed in Iksan, Cheonbuk Province.Two species of Penicillium were isolated from the infected tubers.P. sclerotigenum, which is a novel to Korea, is presently described and illustrated.

View Article: PubMed Central - PubMed

Affiliation: Department of Applied Biology, Chungnam National University, Daejeon 305-764, Korea.

ABSTRACT
During 2007 survey of post-harvest diseases of yam performed in May and June, severe tuber loss caused by blue mold was observed in Iksan, Cheonbuk Province. Two species of Penicillium were isolated from the infected tubers. Based on β-tubulin gene sequence analysis, and cultural and morphological characteristics, the isolates were identified as Penicillium sclerotigenum and P. polonicum. P. sclerotigenum, which is a novel to Korea, is presently described and illustrated.

No MeSH data available.


Brown to dark-brown lesions in the flesh of the yam tuber (A, B), and whitish mycelia and bluish or blue-green spores that developed on the infected tissues after 2 days of incubation at room temperature (C, D).
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Figure 1: Brown to dark-brown lesions in the flesh of the yam tuber (A, B), and whitish mycelia and bluish or blue-green spores that developed on the infected tissues after 2 days of incubation at room temperature (C, D).

Mentions: Yam (Dioscorea batatas Decne) is a perennial vine whose tuber is used for food or as a medicinal supplement (Tae, 1998; Park et al., 2005). Yam tubers are harvested in Korea mostly between October and November, and most of which are stored in cold storage chamber. During a survey of yam post-harvest diseases in May and June of 2007, severe loss of tuber caused by Penicillium was observed in Iksan, Cheonbuk Province. The fungal pathogens penetrate through wounds in the tubers and infect the inner tissue. First symptom of the blue mold infection is soft, watery, discolored spots of varying size on the tuber surface. When an affected area is cut, severe brown to dark-brown lesions in the flesh tissue are seen (Fig. 1). At room temperature a white mold begins to grow on the surface of the lesions and the lesions rapidly become covered with bluish or blue-green spores and fungal mycelia (Fig. 1). Sporulation seldom develops while tubers are held in cool storage, but can develop after the tubers are keep in room temperature.


Two species of penicillium associated with blue mold of yam in Korea.

Kim WK, Hwang YS, Yu SH - Mycobiology (2008)

Brown to dark-brown lesions in the flesh of the yam tuber (A, B), and whitish mycelia and bluish or blue-green spores that developed on the infected tissues after 2 days of incubation at room temperature (C, D).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3755198&req=5

Figure 1: Brown to dark-brown lesions in the flesh of the yam tuber (A, B), and whitish mycelia and bluish or blue-green spores that developed on the infected tissues after 2 days of incubation at room temperature (C, D).
Mentions: Yam (Dioscorea batatas Decne) is a perennial vine whose tuber is used for food or as a medicinal supplement (Tae, 1998; Park et al., 2005). Yam tubers are harvested in Korea mostly between October and November, and most of which are stored in cold storage chamber. During a survey of yam post-harvest diseases in May and June of 2007, severe loss of tuber caused by Penicillium was observed in Iksan, Cheonbuk Province. The fungal pathogens penetrate through wounds in the tubers and infect the inner tissue. First symptom of the blue mold infection is soft, watery, discolored spots of varying size on the tuber surface. When an affected area is cut, severe brown to dark-brown lesions in the flesh tissue are seen (Fig. 1). At room temperature a white mold begins to grow on the surface of the lesions and the lesions rapidly become covered with bluish or blue-green spores and fungal mycelia (Fig. 1). Sporulation seldom develops while tubers are held in cool storage, but can develop after the tubers are keep in room temperature.

Bottom Line: During 2007 survey of post-harvest diseases of yam performed in May and June, severe tuber loss caused by blue mold was observed in Iksan, Cheonbuk Province.Two species of Penicillium were isolated from the infected tubers.P. sclerotigenum, which is a novel to Korea, is presently described and illustrated.

View Article: PubMed Central - PubMed

Affiliation: Department of Applied Biology, Chungnam National University, Daejeon 305-764, Korea.

ABSTRACT
During 2007 survey of post-harvest diseases of yam performed in May and June, severe tuber loss caused by blue mold was observed in Iksan, Cheonbuk Province. Two species of Penicillium were isolated from the infected tubers. Based on β-tubulin gene sequence analysis, and cultural and morphological characteristics, the isolates were identified as Penicillium sclerotigenum and P. polonicum. P. sclerotigenum, which is a novel to Korea, is presently described and illustrated.

No MeSH data available.