Foliar applications of alpha-tocopherol improves the composition of fresh pods of Vigna radiata subjected to water deficiency

Abstract

Alpha-tocopherol (α-Toc), so-called vitamin E, is a low molecular weight lipophilic antioxidant that generally protects plants from stress-induced cellular oxidation. It is well known that exogenously applied α-Toc is effective in improving plant growth and developmental processes under adverse environmental conditions. The current study was performed to determine the best concentration of α-Toc [0 (no spray), 100, 200, and 300 mg L -1 ] that could improve the biological yield and chemical constituents of fresh green pods of mung bean (Vigna radiata) and hence their quality under varying water regimes. Foliar spray of α-Toc significantly improved total soluble proteins, chlorophyll a and b, total soluble sugars, proline, phenolics, total free amino acids, nonreducing sugars, and activities of SOD, POD, and CAT under water stress conditions. However, no prominent change was observed in reducing sugars and biological yield due to externally applied α-Toc in either mung bean cultivar subjected to either water regime. Both mung bean cultivars (Cyclone 7008 and Cyclone 8009) showed similar behavior in chlorophyll a and b, while cv. Cyclone 7008 was superior with respect to the concentrations of total soluble sugars and total free amino acids, whereas Cyclone 8009 was better in activities of CAT, SOD, and POD. Overall, externally applied 200 and 300 mg L -1 α-Toc considerably enhanced the activities of antioxidant enzymes (SOD, POD and CAT), chlorophyll a and b, proline, and total phenolic contents in both mung bean cultivars.

Exogenously applied glycinebetaine induced alteration in some key physio-biochemical attributes and plant anatomical features in water stressed oat (Avena sativa L.) plants

“…However, it is well reported that plants modulate their physio-biochemical processes and anatomical features according to the internal or external climate so as to survive under such harsh conditions (Shafiq et al, 2015;Akram et al, 2016). In the present study, plant growth measured as shoot and root dry weights of both oat cultivars decreased under water deficit conditions, which is in agreement with some earlier findings which also reported a water stress-induced decline in growth of various crops such as wheat (Jatoi et al, 2011;Raza et al, 2012), mungbean (Sadiq et al, 2017), sugar beet (Bloch et al, 2006), grasses (Akram et al, 2007), maize (Zhang et al, 2012) and radish (Akram et al, 2015). They found that water stress-reduced plant growth is linked to the interior status of the plant with respect to specifically photosynthesis, nutrients, hormones, antioxidants, primary and secondary metabolites, fluorescence, quantum use efficiency, respiration, and photosynthetic pigments, etc.…”

“…They found that water stress-reduced plant growth is linked to the interior status of the plant with respect to specifically photosynthesis, nutrients, hormones, antioxidants, primary and secondary metabolites, fluorescence, quantum use efficiency, respiration, and photosynthetic pigments, etc. (Ashraf and Harris, 2013;Sadiq et al, 2017).…”

“…Usually, accumulation of proline within cells/tissues not only depends on the type or intensity of a stress, but also on the levels of endogenous primary and secondary metabolites, as well as type of a plant species to be investigated (Ashraf et al, 2011). It is widely reported that endogenous levels of proline and total phenolics are the indicators of a stress and can be used as selection criteria for stress tolerance (Akram et al, 2016;Sadiq et al, 2017).…”

Effect of foliar application of some vitamins and irrigation intervals on vegetative growth, flowering, and some biochemical constituents of Helianthus annuus L. plants.

“…Perhaps this may be due to the role of vitamins as co -enzyme in an enzymatic cofactor and plant growth regulator (Gomez and Lajolo, 2008). These findings are in agreement with those reported by El-Bassiouny et al (2005), Al-Qubaie (2012) and Sadiq et al (2017).…”

Influence of Effective Micro-Organisms (EM) and some Antioxidant on Storability and Fruit Quality of Mandarin under Cold Storage Conditions

“…Results showed that combination of EM+V.C+V.E increased CAT, APX at chilly storage. likewise, (Sun et al,2010) reported Ascorbic acid ,CH increased CAT,APX ; (Liu et al ., 2014 ) reported that Plums treated with ascorbic acid showed significantly excessive CAT activity during the entire storage period .Also (Sadiq et al, 2017) reported that externally applied 200 and 300 mg L -1 α-Toc significantly increased the activities of antioxidative enzymes (SOD, POD, and CAT). The formation and function of membranes are influenced and some oxidation products such as malondialdehyde (MDA) are presented that react with biomolecules and exert cytotoxic and genotoxic effects.…”