Fig. 4

Mitochondrial gene transfers and losses among four cotton species. The first set columns on the left and the set on the right are mitochondrial protein-encoding genes, their functional categories, and their presence/absence in the nucleus and/or mitochondrion. The first line lists the names of plant species, with their relationships designated by the tree. The colored boxes represent the presence of: (1) mitochondrial full-length intact homologs in the nucleus (red); (2) mitochondrial pseudogene in the nucleus (green); (3) absence of mitochondrial homolog in the nucleus (white); and (4) complete absence of that gene in the mitochondrion (yellow). Center: Venn diagram of the mitochondrial protein-coding genes transferred into the nuclear genome (corresponding to the red and green cells on the left) from G. arboreum (yellow), G. raimondii (blue), G. hirsutum (green), and G. barbadense (red), respectively. The overlap among circles shows the common numts among those species