Table 1.

Sequence similarity results of nifH clones with culturable and unculturable bacterial sequence database

Clone	Similarities with unculturable bacterial database			Similarities with culturable bacterial database
	Unculturable bacterial clone name	E value	Similarities	Culturable bacterial genera	Similarities	E value
PN4	Uncultured bacterium clone Qinglin-5	5e−153	87	Azotobacter vinelandii DJ	79	1e−103
PN5	Uncultured bacterium clone IPA108	5e−145	92	Xanthobacter autotrophicus	88	4e−96
PN8	Uncultured soil bacterium clone T4t035	7e−143	94	Azoarcus sp. BH72	89	2e−110
PN9	Uncultured bacterium clone LM108	1e−165	97	Azotobacter vinelandii	94	3e−155
PN11	Uncultured bacterium clone pCPS202	3e−129	89	Geobacter bemidjiensis	88	2e−122
PN12	–	–	–	Agrobacterium tumefaciens	97	6e−171
PN15	Uncultured bacterium clone LM108	4e−171	97	Pseudomonas stutzeri A1501	87	3e−115
PN19	Uncultured nitrogen-fixing	5e−170	98	Azotobacter vinelandii DJ	95	4e−149
PN24	Uncultured bacterium clone LM108	2e−170	98	Azotobacter chroococcum	98	3e−173
PN25	Uncultured bacterium clone S2j	6e−163	95	Rhodospirillum centenum SW	91	2e−136
PN27	Uncultured soil bacterium clone TC07	7e−150	92	Sideroxydans lithotrophicus	84	7e−100
PN29	–	–		Dechloromonas aromatica	93	1e−152
PN30	Uncultured bacterium clone LM108	3e−168	96	Agrobacterium tumefaciens	96	3e−169
PN31	Uncultured bacterium clone LM108	4e−171	98	Azotobacter vinelandii	95	1e−163
RN3	–	–		Agrobacterium tumefaciens	99	4e−177
RN7	–	–		Dechloromonas aromatica	95	3e−154
RN15	Uncultured cyanobacterium clone FAL	2e−130	92	Burkholderia xenovorans	88	2e−109
RN19	Uncultured bacterium clone Yushu-15	6e−119	87	Geobacter bemidjiensis	87	1e−114
PPN2	Uncultured soil bacterium clone T1t065	1e−133	91	Xanthobacter autotrophicus	87	5e−108
PPN3	Uncultured bacterium clone Yushu-15	6e−131	90	Geobacter sp. M18	89	2e−115
PPN6	Uncultured soil bacterium clone T1t065	1e−146	94	Burkholderia xenovorans	88	7e−114
CN5	Uncultured soil bacterium clone T4t035	2e−150	94	Azoarcus sp. BH72	85	3e−99
CN6	Uncultured soil bacterium clone T1t065	7e−131	90	Methylococcus capsulatus	85	7e−100
CN8	Uncultured soil bacterium clone T1t065	1e−133	91	Methylococcus capsulatus	86	1e−101