TABLE 2.

Phytotoxicities of rhizoxin analogs on rice^a

Compound	Phytotoxicity at concn (μg/ml):
	1	10	20
WF-1360 F	+	++	++
22Z-WF-1360 F	+	++	++
WF-1360 B	−	+	++
WF-1360 C	−	++	++
Rhizoxin D	−	−	−
Rhizoxin	++	++	++

^a−, no phytotoxicity observed; +, slight thickening of the root observed (Fig. 5E); ++, considerable thickening of the root observed (Fig. 5F). The toxicity of each concentration was evaluated on three seeds of each plant, and the experiment was done twice with nearly identical results.