Allelopathic potential and chemical profile of wheat, rice and barley against the herbicide-resistant weeds Portulaca oleracea L. and Lolium rigidum Gaud.

Table 4 Allelochemical profile of benzoxazinoids in barley plants when grown alone or in co-cultivation with Lolium rigidum or Portulaca oleracea. Different letters indicate significant differences between treatments for each crop. Asterisks represent significant reductions, while bold letters indicates significant increases when compared to the control (p ≤ 0.05). N = 5. Shoot and root values are given in Μg kg^− 1 and agar values in Μg L^− 1

Sample	Treatment	DIBOA	DIMBOA	BOA
Shoot	Crop alone	12.4 ± 2.01 a	7.53 ± 4.8 ab	1.44 ± 0.18 b
	+L. rigidum	8.76 ± 2.02 b*	11.31 ± 2.3 a	2.39 ± 0.82 a
	+P. oleracea	5.87 ± 1.55 b*	3.84 ± 0.72 b	1.39 ± 0.10 b
Root	Crop alone	1.83 ± 0.12 b	7.57 ± 1.70 a	1.61 ± 0.15 a
	+L. rigidum	2.07 ± 0.2 ab	6.21 ± 2.55 a	1.44 ± 0.18 a
	+P. oleracea	2.00 ± 0.09 a	4.81 ± 0.63 a	1.38 ± 0.17 a
Agar	Crop alone	1.12 ± 0.08 a	3.09 ± 0.15 b	1.29 ± 0.15 a
	+L. rigidum	1.18 ± 0.10 a	3.72 ± 0.29 a	1.28 ± 0.19 a
	+P. oleracea	1.27 ± 0.12 a	2.45 ± 0.79 b	1.31 ± 0.08 a
Sample	Treatment	MBOA	HBOA	HMBOA
Shoot	Crop alone	14.2 ± 13.9 ab	10.05 ± 9.4 ab	1.32 ± 0.36 a
	+L. rigidum	27.97 ± 2.31 a	21.88 ± 5.24 a	1.64 ± 0.14 a
	+P. oleracea	3.69 ± 2.620 b	2.89 ± 1.800 b	1.05 ± 0.11 a
Root	Crop alone	13.99 ± 6.39 a	10.08 ± 4.51 a	1.29 ± 0.17 a
	+L. rigidum	19.20 ± 18.5 a	13.18 ± 12.2 a	1.36 ± 0.28 a
	+P. oleracea	14.79 ± 11.4 a	10.29 ± 7.68 a	1.22 ± 0.18 a
Agar	Crop alone	5.22 ± 0.78 b	3.65 ± 0.42 b	0.68 ± 0.09 b
	+L. rigidum	8.35 ± 5.30 a	5.70 ± 3.43 a	0.90 ± 0.07 a
	+P. oleracea	6.34 ± 0.78 b	4.47 ± 0.60 a	0.79 ± 0.12 b

2,4-dihydroxy-2 H-benzo[b] [1, 4] oxazin-3(4 H)-one(DIBOA), 2,4-dihydroxy-7-methoxy-2 H-benzo[b] [1, 4] oxazin-3(4 H)-one (DIMBOA), benzo[d]oxazol-2(3 H)-one (BOA), 6-methoxybenzoxazolin-2-one (MBOA), 2-hydroxy-2 H-benzo[b] [1, 4] oxazin-3(4 H)-one (HBOA), 2-hydroxy-7-methoxy-2 H-benzo[b] [1, 4] oxazin-3(4 H)-one (HMBOA)

ISSN: 1471-2229