Table I. P value results of Fisher’s exact test analyzing the familial association between Arabidopsis and rice root hair gene sets.

The test was performed in nine groups with the family size fixed (a combination of one to three Arabidopsis genes and one to three rice genes per family). The design table for each test is given below. AtRH families = families with at least one AtRH gene, non-AtRH families = families with no AtRH gene, OsRH families = families with at least one OsRH gene, non-OsRH families = families with no OsRH gene, AtRHM families = families with at least one AtRHM gene, and AtRH(-RHM) families = families that do not contain an AtRHM gene and contain at least one AtRH gene. P values were corrected by the Bonferroni method to control for multiple testing error rate.

Test Design Table	AtRH Families		Non-AtRH Families
OsRH families
Non-OsRH families
	Rice gene(s) per family
Arabidopsis gene(s) per family	1	2	3
1	1.6699E-152	5.66047E-34	1.125E-09
2	1.85754E-25	6.73908E-17	6.9186E-10
3	7.94086E-06	1.15231E-05	0.006749827

Test Design Table	AtRH(-RHM) Families		Non-AtRH Families
OsRH families
Non-OsRH families
	Rice gene(s) per family
Arabidopsis gene(s) per family	1	2	3
1	3.2434E-154	1.68647E-34	1.1001E-09
2	3.9281E-25	6.8512E-17	1.37369E-09
3	3.58292E-06	1.45424E-05	0.006405968

Test Design Table	AtRHM Families		Non-AtRH families
OsRH families
Non-OsRH families
	Rice gene(s) per family
Arabidopsis gene(s) per family	1	2	3
1	1	1	1
2	0.000578923	0.239459721	0.016056802
3	1	0.072914349	0.905572755