Plant Cell Reports

, Volume 25, Issue 10, pp 1094–1103 | Cite as

Screening and expression analysis of Phytophthora infestans induced genes in potato leaves with horizontal resistance

  • Z. D. Tian
  • J. Liu
  • B. L. Wang
  • C. H. Xie
Genetics and Genomics


Horizontal resistance to late blight with quantitative and durable characteristics is a major objective for potato breeding programs. With the aim of investigating the molecular aspects of horizontal resistance, a cDNA microarray was used to identify Phytophthora infestans-induced genes from 100 expressed sequence tags (ESTs) selected from a subtractive cDNA library. Of the 100 cDNA clones represented on the array, 76 were differentially expressed in infected plants as compared with mock-inoculated control plants. Four groups of genes could be identified according to their expression patterns at three time points, 24, 48 and 72 h postinoculation (hpi). Group A appeared to be strongly induced (>10-fold) at 72 hpi. Group B demonstrated up-regulated expression patterns at all the three time points. The transcripts of group C peaked at 48 hpi, while genes of group D were up-regulated at 24 hpi and decreased slightly thereafter. Blast algorithm searches revealed that the largest set of up-regulated genes (about 35%) was assigned to the primary/secondary metabolism. Other genes with known or putative functions included disease defense or cell rescue (about 18%), transcription, signal transduction, cellular transporter/transport facilitation, development, protein synthesis/destination, as well as those playing roles in cellular organization. Furthermore, 15 genes encoding unknown function proteins were also identified. The results indicated that multiple defense mechanisms are involved in horizontal potato resistance to late blight and alteration in metabolic pathways is one of the most important defense responses.


Horizontal resistance Late blight Pathogen-induced gene Phytophthora infestans Solanum tuberosum L. 



This work was funded by the National High Technology Project of China (2202AA241181), and the National Natural Science Foundation of China (30471100), partially supported by a grant from ICGEB (The International Centre for Genetic Engineering and Biotechnology, CRP/CHN04-01).


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Key Laboratory of Horticultural Plant BiologyMinistry of Education/National Center for Vegetable Improvement (Central China), Huazhong Agricultural UniversityWuhanPeople’s Republic of China

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