TABLE 3.

Number of peptides relevant to CH₄ oxidation and N₂ fixation in enriched microbial cells from root of paddy field-grown rice plant^a

Domain	Family	Genus	CH4 oxidation				N2 fixation
			MMO	MDH	FADH	FDH	NifH	NifD	NifK	VnfD
Bacteria
	Methylocystaceae	Methylosinus	114	32	24	11	7	8	8
	Methylocystaceae	Methylocystis	51	45	7	1		1	2
	Beijerinckiaceae	Methylocella	19						5
	Methylobacteriaceae	Methylobacterium		18
	Bradyrhizobiaceae	Bradyrhizobium		9		1		2
	Bradyrhizobiaceae	Rhodopseudomonas						1	2
	Hyphomicrobiaceae	Hyphomicrobium				1		1
	Rhizobiaceae	Rhizobium					1
	Cystobacterineae	Anaeromyxobacter				1	2
Archaea
	Methanobacteriaceae	Methanobacterium					1			1
	Methanosarcinaceae	Methanosarcina			1				1	1
	Other	Uncultured bacteria		8
Total peptides			184	112	32	15	11	13	18	2

^aBoldface entries indicate members of the family Methylocystaceae, including Methylosinus and Methylocystis. MMO, methane monooxygenase; MDH, methanol dehydrogenase; FADH, formaldehyde dehydrogenase; FDH, formate dehydrogenase; NifH, nitrogenase reductase; NifD, alpha subunit of dinitrogenase; NifK, beta subunit of dinitrogenase; VnfD, alpha subunit of vanadium dinitrogenase.