Intrachromosomal somatic homologous recombination rates in transgenic Arabidopsis lines (lines 651 and R2L1) after XXX infection for various time periods. A. Line 651 B. Line R2L1. Bars indicate the standard error of the mean of three biological repeats, each consisting of about 140–160 plants. Numbers on top of the bars show the respective mean values, not significantly different (P > 0.05), as analysed by Duncan’s multiple range test. Vertical axis shows the mutation rates. (PPT 127 kb