Characterization of resistance to pine wood nematode infection in Pinus thunbergiiusing suppression subtractive hybridization

BMC Plant Biology

Research Article

Tomonori Hirao¹  Atsushi Watanabe²  Eitaro Fukatsu³ 

[1] Forest Bio-research Center, Forestry and Forest Products Research Institute, 3809-1 Ishi, Juo, 319-1301, Hitachi, Ibaraki, Japan;Forest Tree Breeding Center, Forestry and Forest Products Research Institute, 3809-1 Ishi, Juo, 319-1301, Hitachi, Ibaraki, Japan;Kyushu Regional Breeding Office, Forest Tree Breeding Center, Forestry and Forest Products Research Institute, 2320-5 Suya, 860-0081, Goshi, Kumamoto, Japan;

关键词: Gene Ontology;    Subtractive Suppression Hybridization;    Resistant Tree;    Soybean Cyst Nematode;    Resin Canal;   

DOI  :  10.1186/1471-2229-12-13

 received in 2011-09-11, accepted in 2012-01-24,  发布年份 2012

来源: Springer

【 摘 要 】

BackgroundPine wilt disease is caused by the pine wood nematode, Bursaphelenchus xylophilus, which threatens pine forests and forest ecosystems worldwide and causes serious economic losses. In the 40 years since the pathogen was identified, the physiological changes occurring as the disease progresses have been characterized using anatomical and biochemical methods, and resistant trees have been selected via breeding programs. However, no studies have assessed the molecular genetics, e.g. transcriptional changes, associated with infection-induced physiological changes in resistant or susceptible trees.ResultsWe constructed seven subtractive suppression hybridization (SSH) cDNA libraries using time-course sampling of trees inoculated with pine wood nematode at 1, 3, or 7 days post-inoculation (dpi) in susceptible trees and at 1, 3, 7, or 14 dpi in resistant trees. A total of 3,299 sequences was obtained from these cDNA libraries, including from 138 to 315 non-redundant sequences in susceptible SSH libraries and from 351 to 435 in resistant SSH libraries. Using Gene Ontology hierarchy, those non-redundant sequences were classified into 15 subcategories of the biological process Gene Ontology category and 17 subcategories of the molecular function category. The transcriptional components revealed by the Gene Ontology classification clearly differed between resistant and susceptible libraries. Some transcripts were discriminative: expression of antimicrobial peptide and putative pathogenesis-related genes (e.g., PR-1b, 2, 3, 4, 5, 6) was much higher in susceptible trees than in resistant trees at every time point, whereas expression of PR-9, PR-10, and cell wall-related genes (e.g., for hydroxyproline-rich glycoprotein precursor and extensin) was higher in resistant trees than in susceptible trees at 7 and 14 dpi.ConclusionsFollowing inoculation with pine wood nematode, there were marked differences between resistant and susceptible trees in transcript diversity and the timing and level of transcripts expressed in common; in particular, expression of stress response and defense genes differed. This study provided new insight into the differences in the physiological changes between resistant and susceptible trees that have been observed in anatomical and biochemical studies.

【 授权许可】

Unknown   
© Hirao et al; licensee BioMed Central Ltd. 2012. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.