온도가 딸기뿌리썩이선충(Paratylenchus penetrans)과 사과뿌리썩이선충(P. vulnus)의 증식에 미치는 영향
Effect of temperature on reproduction of Pratylenchus penetrans and P. vulnus
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온도가 딸기뿌리썩이선충(Pratylenchus penetrans)과 사 과뿌리썩이선충(P. vulnus)의 증식에 미치는 영향을 구명하기 위하여 들깨에 뿌리썩이선충을 접종 10주 후에 선충의 증식지수(Reproduction factor, Pf/Pi)를 조사하였다. 딸기뿌리썩이선충의 증식지수는 20°C에서 재배된 들깨에서 가장 높았으며, 25°C, 30°C, 15°C 순으로 각각 높았다. 딸기뿌리썩이선충의 증식은 들깨의 재배온도가 25°C까지 증가하다가 30°C에서는 감소하는 경향을 보였다. 사과뿌리썩이선충의 증식은 30°C에서 재배된 들깨에서 가장 높았으며, 25°C, 20°C, 15°C 순으로 높았다. 사과뿌리썩이선충의 증식지수는 온도가 높아질수록 증가하는 경향을 보였다. 두 종간의 증식지수를 비교한 결과 사과뿌리썩이선충(증식 최적 온도 30°C)은 딸기뿌리썩이선충(증식 최적 온도 20~25°C)보다 상대적으로 높은 온도에서 더 많이 증식되는 경향을 보였다.
Abstract
Perilla plant is a special crop that is used as oilseed and food in Korea. Root lesion nematodes have caused great damage to perilla plants, so for effective management of root lesion nematodes, it is necessary to understand their ecology in perilla. In this study, we investigated the effect of temperature in the development of Pratylenchus penetrans (Pp) and Pratylenchus vulnus (Pv) when the nematodes infected the perilla plant. To estimate the effect of temperature, we assessed the reproduction factor (RF); final population/initial population (Pf/Pi) of these two nematode species. We used perilla plants as inoculated hosts and investigated the density of nematodes at 10 weeks after inoculation. As a result, the RF of Pp was highest at 20°C (0.41 (1st test), 2.2 (2nd test)) followed by 25, 30, and 15°C. The RF of Pv was highest at 30°C (9.84 (1st test), 31.39 (2nd test)), followed by 25, 20, and 15°C. Comparing the RF by temperature between Pp and Pv, Pv was higher than Pp at all temperatures used in the test. This study showed the optimal development temperature of Pp was 20-25°C and Pv was 30°C, respectively.
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