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Susceptibility of a hybrid (Pinus rigida×P. x rigitaeda) and P. thunbergii Seedlings to Fusarium circinatum Isolated from P. thunbergii in Jeju Island  

Yoon, Jun-Hyuck (Department of Forest Resources Development, Korea Forest Research Institute)
Woo, Kwan-Soo (Department of Forest Resources Development, Korea Forest Research Institute)
Shin, Han-Na (Department of Forest Resources Development, Korea Forest Research Institute)
Lee, Seong-Kyu (Southern Forest Research Center, Korea Forest Research Institute)
Publication Information
Korean Journal of Breeding Science / v.41, no.4, 2009 , pp. 420-428 More about this Journal
Abstract
In this study, the variation of 20 Pinus thunbergii isolates of F. circinatum from 2 damaged sites in Jeju-Island were compared with a known Fusarium circinatum using molecular biological techniques. Two- and four-year-old seedlings of Pinus rigida${\times}$Pinus x rigitaeda and two-, three- and six-year-old seedlings of P. thunbergii were inoculated with one of the most virulent isolates, FT-7, to determine differences in susceptibility. In site 1 (FT), 13 isolates of F. circinatum were isolated from 14 individuals and in site 2 (FS), 7 isolates of F. circinatum were isolated from 9 individuals. No difference was found in the sequences of the internal transcribed spacer (ITS) region of the ribosomal RNA genes in the FS and FT isolates, and also even in the known isolate of F. circinatum, FE 1-1. However, the ITS sequences of the FS and FT isolates differed from those of a fungus, Botrytis cinerea. Two-year-old seedlings of P. rigida${\times}$P. x rigitaeda showed higher susceptibility (93.3% of mortality) than four-year-old ones. Three-year-old seedlings of P. thunbergii showed the highest susceptibility (66.7% of mortality) compared to those at other ages in the same species. We found a positive correlation between basal diameter and lesion length in the seedlings of P. rigida${\times}$P. x rigitaeda ($R^2=0.66$) and P. thunbergii (p < 0.0001), respectively. There were significant differences in susceptibility by the age of seedlings in each of P. rigida${\times}$P. x rigitaeda (p < 0.0001) and P. thunbergii (p < 0.0001) based on lesion length.
Keywords
Fusarium circinatum; Pinus rigida${\times}$Pinus x rigitaeda; Pinus thunbergii; susceptibility;
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