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. 2009 May 15;4(5):e5556. doi: 10.1371/journal.pone.0005556

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Dong et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) A model for the organization of Avr3c in P. sojae P6497. The Avr3c gene is embedded in a 33.7 kb repetitive segment. The position of two Avr3c genes, Avh27b, and eight other predicted genes in the repetitive segment are shown; arrow indicates direction of transcription. A list of predicted genes occurring in the replicated segment is provided in the Table S1. (B) The upper portion shows the Avr3c pre-protein, including the position of the signal peptide, RXLR-dEER motif, and the effector domain. The positions of mutations causing amino acid changes to Avr3c are indicated with red bars; green boxes show W-motifs. The lower portion shows the predicted amino acid sequences of a portion of the effector domain of the four Avr3c alleles (numbered 1 to 4), encoding three distinct protein products. Variant amino acid residues are shown in red. The Avr3c^ACR9 and Avr3c^ACR8 alleles differ in only in nucleotide sequence. (C) Haplotype analysis of Avr3c gene copies in 17 different P. sojae strains. The strains were scored as virulent (V) or avirulent (A) on Rps3c soybean plants. The Avr3c haplotype was determined by DNA sequence analysis, using genomic DNA template purified from each of the 17 P. sojae strains shown in the figure. The two copies of Avr3c in each P. sojae strain were scored and numbered according to the different alleles shown in part (B).