Bulletin of the National Research Centre

Table 1 Effect of bio-control agents, aqueous plant extracts, and citric acid as soil treatment and/or foliar spray on plant enzyme activity of peroxidase, polyphenol oxidase, and chitinase in field application

From: Field application of bio-control agents and aqueous plant extracts for controlling bacterial soft rot and enhancement yield quality of Solanum tuberosum L. cv. Diamond

Treatments	Plant enzymatic activity
	Soil treatment						Foliar spray
	Peroxidase		Polyphenol oxidase		Chitinase		Peroxidase		Polyphenol oxidase		Chitinase
	OD	Incr.%	OD	Incr.%	OD	Incr.%	OD	Incr.%	OD	Incr.%	OD	Incr.%
Bacillus subtilis	2.711a*	222	0.413a	1047	0.088a	633	2.300abc	89	0.210a	453	0.067cde	379
Bacillus pumilus	2.675 a	218	0.164a	356	0.078ab	550	2.583ab	112	0.195a	413	0.103bc	636
Trichoderma harzianum	2.638 a	214	0.147bc	308	0.077ab	542	2.634a	116	0.187a	392	0.070 cd	400
Trichoderma virens	2.665 a	217	0.141bc	292	0.053abc	342	2.609a	114	0.135bcd	255	0.106bc	657
Lantana	2.051 b	144	0.141bc	292	0.050bc	317	2.106bcd	73	0.128 cd	237	0.017ef	21
Lemongrass	2.117 b	152	0.122bc	239	0.048bc	300	1.934cde	59	0.165abc	334	0.133b	850
Olive cake	2.107 b	151	0.126bc	250	0.044c	267	2.053cde	69	0.183ab	382	0.064cdef	357
Citric acid	NT						2.197abc	80	0.202a	432	0.221a	1479
PDB medium only	1.494 c	78	0.106bc	194	0.043 cd	258	1.635def	34	0.054e	42	0.026def	86
NB medium only	1.665 c	98	0.107bc	197	0.035 cd	192	1.609a	32	0.086de	126	0.030def	114
Control	0.840 d	-	0.036 c	-	0.012 d	-	1.218f	-	0.038e	-	0.014f	-

NT not test
*Means in each column followed by different letter(s) are significantly different according to Duncan’s multiple range test at P ≤ 0.05

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