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KMID : 1098420160240050360
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Korean Journal of Medicinal Crop Science
2016 Volume.24 No. 5 p.360 ~ p.369
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Chemotactic Response Study of Cylindrocarpon destructans towards Ginseng Root Exudates
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Xu Yong-Hua
Chi Kun
Zhan Aihua
Lei Fengjie
Yang He
Zhao Yan
Li Kuo
Wang Erhuan
Li Qiong
Kim Jong-Seok
Lee Seung-Ho
Kim Young-Chang
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Abstract
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Background: Cylindrocarpon destructans (Zins) Scholten is an important pathogenic fungus that causes ginseng root rot in many ginseng growing areas in China. Although C. destructans have been studied worldwide, research on its chemotaxis towards ginseng (Panax ginseng C. A. Meyer) root exudates in the rhizosphere remains limited.
Methods and Results: In this study, we collected ginseng root exudates with three different polarities from three-year-old ginseng roots, and performed chemotaxis and spore germination assays to investigate the ability of these exudates to induce the response in C. destructans. The results showed that, compared with other conditions, when C. destructans cultivated at 20℃ and a pH of 6 exhibited a strong positive chemotactic response toward 2 ㎎/ℓ aqueous phase, 20 ㎎/ℓ butanol phase, and 0.2 ㎎/ℓ petroleum ether from ginseng root exudates, the chemotactic moving indexes were 0.1581, 0.1638 and 0.1441, respectively. In addition, the spore germination rate with optimal chemotactic parameters were 48%, 53%, and 41% in the aqueous phase, butanol phase and petroleum ether groups, respectiviely, which were significantly higher than that in the control group (23%) (p < 0.05). The mycelial growth rate with optimal chemotactic parameters increased with culture time, and the maximum growth rates in the aqueous phase, butanol phase and petroleum ether groups were 0.425, 0.406 and 0.364 respectively, on the 4th day. The optimal chemotactic parameters were 39.73 ㎎/50 ㎎/ℓ , 48.93 ㎎/50 ㎎/ℓ , and 31.43 ㎎/50 ㎎/ℓ , in aqueous phase, butanol phase and petroleum ether
respectively, from ginseng root exudates, compared with 5.5 ㎎/50 ㎎/ℓ , in the control group.
Conclusions: The present study revealed that certain ginseng root exudates containing chemical attractants act as nutritional sources or signals for C. destructans and support its colonization of ginseng roots.
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KEYWORD
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Panax ginseng, Chemotaxis, Cylindrocarpon destructans, Root Exudates
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