Table 4.

Assumed orthologs in the wheat mt and ct genomes and Pm and Pu genomes, based on the sequence homology of the wheat mtDNA segments to the homologous segments in wheat ct, Pm and Pu genomes^a) and the genes located in those segments of the four genomes^b)

Wheat mtDNA segment			Wheat ct genome			Pm genome			Pu genome
Segment no.	Size (bp)	Gene	Match. nts.	Homol. (%)	Gene	Match. nts.	Homol. (%)	Gene	Match. nts.	Homol. (%)	Gene
1a	54	trnQ-1*	45	83.3	trnQ*	46	85.2	trnQ*	41	75.9	trnQ*
2	76	trnS-2*	62	81.6	trnS-2*	21	27.3	trnS*	55	71.4	trnS*
12	793	atp1*	537	67.7	atpA*	461	66.0	atpA*	564	71.1	atpA*
18	116	trnF	111	95.7	trnF	62	53.4	trnF*	43	37.1	trnF*
19a	27	-	27	100.0	trnF*	22	81.5	trnF*	22	81.5	trnF*
20	46	trnC*	39	84.8	trnF*	43	93.5	trnC*	39	84.8	trnC*
24	73	trnM	69	94.5	trnM	40	54.8	trnT*	25	34.2	aldA*
28	82	trnW	79	96.3	trnW	57	69.5	trnW*	40	48.8	trnW*
30a	64	trnP-1*	53	82.8	trnP*	46	71.9	trnP-1*	51	79.7	trnP*
31	45	-	40	88.9	-	30	66.7	(Note 1)	21	46.7	(Note 2)
40	177	rps12*	128	72.3	-	103	58.2	rps12*	54	30.5	rps12*
41ac)	1,932	rrn18-1	927	75.6	rrn16	947	77.2	rrn16	968	79.0	rrn16
43ad)	3,145	rrn26-1	1,160	73.7	rrn23	1,202	73.0	rrn23	1,600	75.8	rrn23
45	65	rrn26-p	64	98.5	rrn23*	56	86.2	rrn23*	53	81.5	rrn23*
46	86	trnN	85	98.8	trnN	61	70.9	trnN	53	61.6	trnN*
47a	59	trnK-1*	47	79.7	trnN*	45	76.3	trnN*	50	84.7	trnN*
48e)	65	nad5b*	53	81.5	ndhF*	53	81.5	?	54	83.1	nuoL*
51e)	39	nad1c*	32	82.1	ndhA 3′-ex*	27	69.2	ndh SU*	21	53.8	?

a) Sequence homology (%) = [No. nucleotides matched between the wheat mtDNA segment and the DNA segment in comparison]/[No. nucleotides in the wheat mtDNA segment] × 100.

b) Genes reported in wheat mt, wheat ct, Pm and Pu genomes by Ogihara et al.,^14,15) Copeland et al.²⁵⁾ and Giovannoni et al.,²⁶⁾ respectively. *: Part of the gene located. “-“, “?” and “-p” indicate no gene reported, undesignated gene located, and pseudogene, respectively.

c) Homology of the 1,226 bp conserved regions of the no. 41a mtDNA segment to those of the wheat ct, Pm and Pu genomes.³¹⁾

d) Homology of the 1,573–2,110 bp conserved regions of the no. 43a mtDNA segment to those of the wheat ct, Pm and Pu genomes.³¹⁾

e) nad, ndh and nuo: All are NADH dehydrogenase genes.

Note 1: cytidylate kinase gene, Note 2: D amino acid oxidase gene.