Allelopathic Effects of Aqueous Extracts of Sorghum (Sorghum bicolor L. Moench) on the Early Seedling Growth of Sesame (Sesamum indicum L.) Varieties and Selected Weeds

Table 8

Effect of different concentrations of sorghum leaf and stem aqueous extracts on PAL, POD, and PPO activity in the sesame variety Lindi Zimbabwe.

Extract concentration (%)	Enzyme effects
	PAL (µg PAL )	POD (U µl^−1 min^−1)	PPO (U µl^−1 min^−1)
0 (control)	0.611^a	0.139^a	0.114^a
2.5	0.928^ab	0.198^a	0.389^bc
5.0	0.944^b	0.262^a	0.275^b
7.5	0.782^ab	0.288^a	0.130^a
10.0	1.348^c	0.558^b	0.504^c
-value	0.002	0.015	<0.001
LSD	0.320	0.237	0.135
CV (%)	28.8	68.1	39.8
	Extract tissue effects
Extract tissue	PAL (µg PAL g^−1)	POD (U µl^−1 min^−1)	PPO (U µl^−1 min^−1)
Leaf	0.664^a	0.266	0.294
Stem	1.181^b	0.312	0.271
-value	0.002	0.015	0.581
LSD	0.203	ns	ns
CV (%)	28.8	68.1	39.8

Means followed by the same letter in the column are not significantly different at .