Role of jasmonic acid in improving tolerance of rapeseed (Brassica napus L.) to Cd toxicity

Abstract

Abstract:The well-known detrimental effects of cadmium (Cd) on plants are chloroplast destruction, photosynthetic pigment inhibition, imbalance of essential plant nutrients, and membrane damage. Jasmonic acid (JA) is an alleviator against different stresses such as salinity and drought. However, the functional attributes of JA in plants such as the interactive effects of JA application and Cd on rapeseed in response to heavy metal stress remain unclear. JA at 50 µmol/L was observed in literature to have senescence effects in plants. In the present study, 25 µmol/L JA is observed to be a "stress ameliorating molecule" by improving the tolerance of rapeseed plants to Cd toxicity. JA reduces the Cd uptake in the leaves, thereby reducing membrane damage and malondialdehyde content and increasing the essential nutrient uptake. Furthermore, JA shields the chloroplast against the damaging effects of Cd, thereby increasing gas exchange and photosynthetic pigments. Moreover, JA modulates the antioxidant enzyme activity to strengthen the internal defense system. Our results demonstrate the function of JA in alleviating Cd toxicity and its underlying mechanism. Moreover, JA attenuates the damage of Cd to plants. This study enriches our knowledge regarding the use of and protection provided by JA in Cd stress.

Jasmonic Acid Seed Treatment Stimulates Insecticide Detoxification in Brassica juncea L.

“…These hormones modulate the antioxidative defense system of plants, resulting in reduction of the oxidative stress under abiotic stress conditions. Earlier studies have also reported the protective role of JA in Brassica plants under different abiotic stress conditions like salt ( Kaur et al, 2017 ), cadmium ( Ali et al, 2018 ), arsenic ( Farooq et al, 2016 ), and lead ( Bali et al, 2018a ). JA also regulates the plant defense system under herbicide toxicity by modulating the biochemical and physiological responses of tobacco plants ( Kaya and Doganlar, 2016 ).…”

Effects of Salinity on Seed Germination and Early Seedling Stage

“…Seed germination and seedling establishments are the two critical stages in plant growth. These stages are the most sensitive to environmental conditions including salinity [120]. Plants are usually seeded within the top layer of the soil which is more saline than lower layers [121].…”

Salinity tolerance in barley during germination—homologs and potential genes

“…Nitric oxide (NO) regulates several plant growth and developmental activities, stress signalling molecules and stress responses, including salinity and the activation of antioxidant enzymes (superoxide dismutase (SOD), CAT, guaiacol peroxidase (GPX), ascorbate peroxidase (APX), and glutathione reductase (GR)), and triggers the expression of various redox-regulated genes that enhance germination and root growth under salinity stress (Gupta and Huang, 2014). Salinity stress mitigation by NO is due to its antioxidant functions, modulation of the ROS detoxification system (Mishra et al, 2011) associated with an increase in antioxidant enzymes, such as SOD, CAT, GPX, APX, and GR (Zhao et al, 2004;Ali et al, 2018), and suppression of malondialdehyde (MDA) production during lipid peroxidation (Nalousi et al, 2012). NO offers a force for Na + /H + exchange, providing the H + gradient to stimulate H + -ATPase (H + -PPase) and contributing to K + and Na + homeostasis (Zhang et al, 2006;Gupta and Huang, 2014).…”