Salt-induced changes in photosynthetic activity and oxidative defense system of three cultivars of mustard (Brassica juncea L.)

By Parvaiz Ahmad, Khalid Rehman Hakeem, Ashwani Kumar, M. Ashraf, N. Akram. 2012

231 citations recorded by the source corpus.

A greenhouse experiment was conducted to assess salt-induced modulation in gas exchange attributes and some key enzymes of oxidative defense system in three cultivars of mustard (Brassica juncea L.), Varuna, RH-30 and Rohini, under saline conditions. After 21 days of seed germination, three salt treatments (0, 100 and 200 mM NaCl) were applied to the root growing medium. Salt treatments for three weeks significantly decreased the biomass, shoot and root lengths, CO2-assimilation rate (A), transpiration rate (E), stomatal conductance (gs), chlorophyll a and b pigments and relative water contents (RWC), while electrolyte leakage, proline, H2O2,malondialdehyde (MDA) and activities of superoxide dismutase (SOD), peroxidise (POD), catalase (CAT) and glutathione reductase (GR) enzymes increased in all three mustard cultivars. In comparison with the two other cultivars, cv. Varuna had higher shoot fresh and dry weight, proline content and activities of SOD, ascorbate peroxidase (APX), CAT and GR, while RH-30 and Rohini were higher in electrolyte leakage, H2O2 and MDA levels. Overall, the differential growth of all three mustard cultivars under saline conditions was found to be attributable to differential photosynthetic and transpiration rates, stomatal conductance, chlorophyll pigments and relative water contents, hence these could be used as potential selection criteria for screening mustard germplasm for salt tolerance. Key words: Salt stress, Brassica juncea, antioxidant enzymes, proline.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/8ee8b2431a0e047d41dbe147fff3aadd66629c9a

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Citations in the corpus

Alleviation of abiotic salt stress in Ochradenus baccatus (Del.) by Trichoderma hamatum (Bonord.) Bainier (2014, methodology): “The estimation of TWC was according to Smart and Bingham (1974) and described by Ahmad et al. (2012).”
Portraying mechanics of plant growth promoting rhizobacteria (PGPR): A review (2016, background): “To minimize the effect of oxidative stress, plants have developed efficient antioxidant system that can protect them from this disaster (Azooz et al., 2011; Parvaiz et al., 2012).”
Arbuscular mycorrhizal fungi enhances salinity tolerance of Panicum turgidum Forssk by altering photosynthetic and antioxidant pathways (2015, background): “Salinity triggers osmotic effects resulting in reduced growth through alterations in physio-biochemical processes like photosynthesis, enzyme activity and ion homeostasis (Ahmad et al. 2012; Porcel et al. 2012; Fatma et al. 2014).”
Alleviation of salt-induced adverse impact via mycorrhizal fungi in Ephedra aphylla Forssk (2014, background): “The ROS generated through oxidative stress reacts with membrane lipids and causes lipid peroxidation (Ahmad, Jaleel & Sharma 2010; Ahmad et al. 2012; Rasool, Ahmad, et al. 2013).”
Plant Response to Salt Stress and Role of Exogenous Protectants to Mitigate Salt-Induced Damages (2013, background): “…high salinity, cold, and heat negatively in fl uence the survival, biomass production and yield of staple food crops up to 70% (Vorasoot et al. 2003 ; Kaur et al. 2008 ; Ahmad et al. 2010a ; Thakur et al. 2010 ; Mantri et al. 2012 ; Ahmad et al. 2012 ) ; hence, threaten the food security worldwide.”
Effect of salinity stress on plants and its tolerance strategies: a review (2015, background): “The major abiotic stresses like high salinity, drought, cold, and heat negatively influence the survival, biomass production, and yield of staple food crops up to 70 % (Vorasoot et al. 2003; Kaur et al. 2008; Ahmad et al. 2010a; Thakur et al. 2010; Mantri et al. 2012; Ahmad et al. 2012).”
Phytohormones Regulate Accumulation of Osmolytes Under Abiotic Stress (2019, background): “Proline acts as an osmolyte and improves osmotic adjustment by stabilizing macromolecules by protecting them against the severities of ROS [265].”
Comparison of Biochemical, Anatomical, Morphological, and Physiological Responses to Salinity Stress in Wheat and Barley Genotypes Deferring in Salinity Tolerance (2020, background): “The hostile influences of NaCl stress on lipid peroxidation have been reported in other plants, for example in Brassica juncea [60] and Vicia faba [61], and MDA has been widely recognized as a good salinity tolerance marker in plant species [62].”
Mitigation of sodium chloride toxicity in Solanum lycopersicum L. by supplementation of jasmonic acid and nitric oxide (2018, background): “Our results corroborate with the findings of Ahmad (2012), who demonstrated increased membrane leakage and hence, reduced stability of membranes in B. juncea exposed to salt stress.”