클로버씨스트선충이 무시들음병 발병에 미치는 효과
Effects of Heterodera trifolii on Fusarium wilt disease in radish plants
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초록
무는 중요한 채소작물 중 하나이며 강원도 고랭지에서는 시들음병 Fusarium oxysporum f. sp. raphani에 의해 지속적으로 경제적인 피해를 받아왔다. 최근에는 정선군의 고랭지에서 배추과 작물을 기주로 하는 클로버씨스트선충(Heterodera trifolii)이 발생하여 무 생산에도 위협을 가하고 있다. 이 선충은 무에 직접적인 피해뿐만 아니라 다른 병원균과 복합감염에 의한 2차 피해를 일으킬 수 있는 것으로 잘 알려져 있다. 따라서, 본 연구에서는 무시들음병균의 발병에 있어 클로버씨스트선충이 미치는 영향을 알아보고자 하였다. 무시들음병균과 클로버씨스트선충을 복합감염시킨 처리구의 식물 초장은 무시들음병균을 단독감염시킨 처리구의 식물 초장보다 더 낮은 경향을 보였으나 통계적인 유의성은 없었다. 반면, 무시들음병균과 클로버씨스트선충을 복합감염시킨 처리구의 발병도 (1.60±0.97)는 무시들음병균을 단독감염시킨 처리구 (0.20±0.42)보다 더 높은 것으로 나타났다. 발병률도 무시들음병균과 클로버씨스트선충 복합처리구 (80%)가 무시들음병균 단독처리구(44%)보다 2배 정도 높은 것으로 나타났다. 본 연구 결과에 따라 강원도 고랭지에서 무시들음병의 방제전략 수립시에는 클로버씨스트선충의 방제도 함께 고려해야 할 것으로 생각된다.
Abstract
Radish is one of the major vegetable crops and has been damaged economically by the causal agent of Fusarium wilt disease, Fusarium oxysporum f. sp. raphani (FO) in the highlands of Gangwon province, Korea. Recently, clover cyst nematode, Heterodera trifolii (HT), occurred in highland of Jeongseon area and poses a threat to radish plants. The nematodes, besides causing direct damage to radish plants, possess the capability to synergize with other plant pathogens, leading to the development of a disease complex. The aim of this study was to investigate the interaction between FO and HT in radish plants. The length of plants co-infected with both FO and HT was shorter than that of plants infected with FO alone, but there was no statistically significant difference. However, the disease severity was much higher in the plants co-infected with both FO and HT (1.60±0.97) compared to FO alone (0.20±0.42) (df=3, F=10.17, p<0.001). Disease incidence was also about two-fold higher in plants co-infected with both FO and HT (80%) compared to FO alone (44%). These results suggested that the clover cyst nematode should be considered in the management of Fusarium wilt disease in the highlands of Gangwon province.
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