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Table 2 Differences in mitochondrial genes encoding proteins between barley and wheat

From: Mitochondrial genome sequences from wild and cultivated barley (Hordeum vulgare)

Gene in barley

Differences from wheat

nad6

1. Low homology at 3′ side (from 646 to 738 nt).

2. Additional 201 nt on 3′ side (67 amino acid on the C-terminus) because of stop codon substituted to leucine caused by A to T substitution at 737 nt.

nad9

Deficient of 97 aa on 5′ side, however identical to ones in rice, bamboo, maize, sorghum and ryegrass.

cox1

Two additional C-terminal aa.

Wheat cox1 is the same as that of rice and bamboo.

atp6

Low homology at 5′ sidea.

rps2

Low homology at 3′ sideb.

rps4

Insertion of 78 nt (26 aa) caused by multiple repeat sequences.

Barley has three of 39 nt repeat sequence, whereas wheat has one of this sequence.

rpl5

Difference of 10 aa on C-terminus.

Wheat rpl5 is same as that of rice, bamboo and ryegrass.

rrn18

Insertions of 18 nt and 4 nt.

  1. aBonen and Bird [36] indicated that the N-terminus of ATP6 in the mitochondrial genome had interspecies variation caused by processing
  2. bKubo et al. [37] reported RPS2 in barley (BAD61010) and interspecies variation in Triticeae at its C-terminus