28-Homobrassinolide alleviates oxidative stress in salt-treated maize (Zea mays L.) plants

Abstract

The present investigation was undertaken to study the effects of 28-homobrassinolide on the activities of antioxidative enzymes such as superoxide dismutase (EC 1.15.1.1), guaiacol peroxidase (EC 1.11.1.7), catalase (EC 1.11.1.6), glutathione reductase (EC 1.6.4.2) and ascorbate peroxidase (EC 1.11.1.11), as well as protein and malondialdehyde concentrations in 30-d-old plants of Zea mays L. grown under salt stress. The seeds were soaked in 28-homobrassinolide solutions (0, 10 -8 , 10-6 and 10 -4 mM) for 12 h and then sown in the field in a randomized block layout. The blocks were salinised with NaCl at concentrations of 0, 25, 50 and 75 mM. The activities of antioxidative enzymes and protein concentration increased in 28-homobrassinolide-treated plants. Despite the enhancement of enzyme activities under salt stress alone, lipid peroxidation increased and protein concentration decreased. However, pre-sowing treatments of 28-homobrassinolide further enhanced the activities of antioxidative enzymes in addition to lowering lipid peroxidation and increasing protein concentration, thus suggesting that 28-homobrassinolide can alleviate oxidative stress in salt-treated maize plants.

Growth and antioxidant responses in mustard (Brassica junceaL.) plants subjected to combined effect of gibberellic acid and salinity

“…Our results of increasing concentration of POD activity corroborates with the findings of Arora et al (2008) who reported that increase in NaCl concentration increases the POD activity in maize plants. Chen et al (2007) also observed increase in POD activity in Vigna unguiculata subjected to salinity stress.…”

Induction of salt stress tolerance in cowpea [<italic>Vigna unguiculata</italic> (L.) Walp.] by arbuscular mycorrhizal fungi

“…Excessive production of free radicals can lead to membrane disfunctioning. Higher POD activity in salt stressed plants corroborate with the results of Arora et al, (2008) and Ahmad (2010). Chen et al, (2007) demonstrated increased activity of POD in salt exposed Vigna unguiculata seedlings.…”

Impact of Seawater Salinity on Ultrastructure of Chloroplasts and Oleosomes in Relation to Fat Metabolism in Flag Leaf of Two Wheat Cultivars During Grain-filling

“…Lipid peroxidation rate was found to increase with increase of salt stress especially in sensitive cultivars [10] in this connection, Joshi et al [11] stated that with increasing level of salinity stress, the malondialdehyde (MDA) content increased in four Brassica juncea varieties. The accumulation of glycerol is an adaptive response of plants and other organisms to the lack of water and salinity stress.…”