Table 1.

Effect of arsenic on colonization of root.

S. No.	Dai (days after inoculation)	Percent colonization (control plant)	Percent colonization (as treated plant)
1	1	~10	~10
2	2	~60	~60
3	3	~75	~75
4	4	~75	~75
5	5	~75	~75

The chlamydospores distribution within the root was considered as an indicator for presence of fungus and this was applied to study colonization. Percent colonization was calculated for the inoculated plants according to the method described previously (Mcgonigle et al., 1990).