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Figure 6 | BMC Evolutionary Biology

Figure 6

From: Unique genes in plants: specificities and conserved features throughout evolution

Figure 6

Unique gene conservation in the plant kingdom. Study of unique gene conservation through evolution of Arabidopsis thaliana (Brassicales), Oryza sativa (Poales), Physcomitrella patens (Funariaceae) and Ostreococcus lucimarinus (Prasinophyceae). Unique genes of each species were characterized (number below species name, total nuclear genes between brackets) and orthology relationships between couples of species were established using the previously described protocol. Phylogenetic conservation of unique genes was analysed from O. lucimarinus (orange line) and A. thaliana (blue line) discarding not conserved unique genes on each node (evolution distance showed in millions of years [28, 29, 74, 78, 79]. Remaining genes in each case were compared to eliminate inconsistencies and obtain a final list of 192 unique genes conserved as unique in the four species: U{1:1:1:1} genes. These 192 conserved unique genes are far more than the 8.38 U{1:1:1:1} genes expected by random conservation (black dashed line).

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