Table 5.

The H₂O₂ content (nmol g⁻¹ FW), TBARS content (nmol g⁻¹ FW), APX activity (U mg⁻¹ protein min⁻¹), and GR activity (U mg⁻¹ protein min⁻¹) of mustard plant (B. juncea L.) grown with 200 μl L⁻¹ Eth and/or 2-mg Se kg⁻¹ soil in the presence or absence of 24-mg As kg⁻¹ soil at 30 DAS.

Treatments	H2O2 content	TBARS content	APX activity	GR activity
Control	17.6 ± 0.81d	05.3 ± 0.26d	2.11 ± 0.09f	0.16 ± 0.006f
As	34.4 ± 1.60a	12.2 ± 0.60a	4.08 ± 0.16c	0.25 ± 0.011c
Eth + Se	05.2 ± 0.58f	1.91 ± 0.08f	08.9 ± 0.51b	0.43 ± 0.022b
Eth + Se + As	09.7 ± 0.47e	2.90 ± 0.12e	10.1 ± 0.54a	0.47 ± 0.027a
NBD	22.9 ± 0.84c	09.8 ± 0.41c	2.80 ± 0.09de	0.19 ± 0.007de
Eth + Se + As + NBD	29.8 ± 1.55b	11.3 ± 0.56b	2.92 ± 0.11d	0.20 ± 0.008d

The treatment with 100-μM NBD was applied either alone or with combination of 200 μl/L Eth and 2-mg kg⁻¹ soil Se with 24-mg As kg⁻¹ soil. Data are presented as treatment mean ± SE (n = 4). Data followed by same letter are not significantly different by LSD test at p < 0.05. APX, ascorbate peroxidase; As, arsenic; Eth, ethephon; FW, fresh weight; GR, glutathione reductase; H₂O₂, hydrogen peroxide; NBD, norbornadiene; Se, Selenium; TBARS, thiobarbituric acid reactive substances.