Enhancement of salinity stress tolerance and plant growth in finger millet using fluorescent pseudomonads

A Review of Recent Advances and Future Directions in the Management of Salinity Stress in Finger Millet

“…Proline is among the compatible solutes employed, and it acts as an osmoprotectant in plants under salinity stress as it preserves the integrity of the membrane and alleviates oxidative burst in plants ( Rao et al, 2013 ; Rasool et al, 2013 ). In their study, Mahadik and Kumudini (2020) reported higher levels of proline accumulation in salt-tolerant cultivars than in salt-sensitive plants. Although determining the physiological and biochemical response of finger millet to salinity stress is vital for breeding and selecting salinity tolerant varieties, screening is time-consuming, and it is expensive for breeders to produce new salinity-tolerant varieties, because the biochemical and physiological traits obtained are highly variable owing to genetic heterogeneity response to salinity.…”

“…Proline accumulation in plants is related to water deficit and salinity stress, where it acts as an osmolyte for osmotic adjustment, stabilizes membranes and proteins, scavenges free radicals, and buffers cellular redox potential under stress conditions ( Boscaiu Neagu et al, 2012 ). An increased level of endogenous proline accumulation in plants is correlated with enhanced salt tolerance ( Sripinyowanich et al, 2013 ), and has been reported in a number of plant species such as Pisum sativum ( Ozturk et al, 2012 ), Glycine max ( Weisany et al, 2012 ), Cucumis melo ( Sarabi et al, 2017 ), Oryza sativa ( Kibria et al, 2017 ), and Eleusine coracana ( Mahadik and Kumudini, 2020 ; Mukami et al, 2020 ).…”

“…Several studies suggest that chlorophyll content is a biochemical marker of salt tolerance in plants ( Taïbi et al, 2016 ; Ishikawa and Shabala, 2019 ). Salt-tolerant finger millet varieties have reported increased or unchanged chlorophyll levels under salinity conditions, whereas chlorophyll content decreased in salt-sensitive plants ( Hema et al, 2014 ; Mahadik and Kumudini, 2020 ; Mukami et al, 2020 ). Plants use compatible solute accumulation to counter-attack the adverse effects of ROS.…”

“…To date, only one report is available on the use of PGPR in enhancing salinity tolerance in finger millet. Mahadik and Kumudini (2020) investigated the effects of fluorescent Pseudomonas strains (SPF-5, SPF-33, and SPF-37) isolated from saline regions on salinity sensitive finger millet seeds. In their study, finger millet seeds were treated with isolates and exposed to various concentrations (0–350 mM NaCl) of salt stress.…”

The Contrivance of Plant Growth Promoting Microbes to Mitigate Climate Change Impact in Agriculture

“…Osmotic stress occurs as a result of the excessive concentration of salts, decreased water potential and plants' inability to uptake water. Consequently, this leads to an ion imbalance in the plants and accumulation of salts ions in plant tissues [68,69]. This can contribute to heavy damage to plant metabolisms, which can further lead to stunted plant growth and reduced yield [65].…”