Research in Plant Disease 2011;17(2):177-183.
Published online August 30, 2011.
푸사리움가지마름병균 Fusarium circinatum이 소나무류 묘목의 병 진전과 침엽의 가스교환에 미치는 영향
우관수, 윤준혁, 한상억, 우수영
 
Effects of Fusarium circinatum on Disease Development and Gas Exchange in the Seedlings of Pinus spp.
Kwan Soo Woo, Jun Hyuck Yoon, Sang Urk Han, Su Young Woo
Abstract
Four-year-old seedlings of Pinus thunbergii, Pinus densiflora and Pinus rigida were inoculated with Fusarium circinatum isolate (FT-7), the pitch canker fungus, from P. thunbergii, to evaluate the effects of the pathogen on disease development and gas exchange rate. Needle dehydration was evident on 2 of 10 seedlings of P. thunbergii and P. rigida at 18 and 21 days after inoculation, respectively, while no symptoms were observed in P. densiflora seedlings throughout the experiment. Gas exchange stopped completely in 4 of 5 measured seedlings of P. thunbergii and 2 of 5 measured seedlings of P. rigida at 25 days after inoculation, and in the remaining 3 seedlings of P. rigida at 39 days after inoculation. Disease development in P. thunbergii seedlings was faster than that in P. rigida seedlings. By the time, the experiment was ended at 78 days after inoculation, 9 of 10 seedlings of P. rigida and 8 of 10 seedlings of P. thunbergii seedlings treated with FT-7 was almost dead, but all seedlings of P. densiflora were still healthy. We suggest that P. densiflora is resistant to F. circinatum in the current study, and gas exchange rate of the species after inoculation does not differ significantly compared to that of untreated control.
Key Words: Fusarium circinatum, Gas exchange, Inoculation, Pitch canker


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