Abstract
BackgroundSalinity is one of the damaging abiotic stress factor. Proper management techniques have been proposed to considerably lower the intensity of salinity on crop growth and productivity. Therefore experiments were conducted to assess the role of improved nitrogen (N) supplementation on the growth and salinity stress tolerance in wheat by analyzing the antioxidants, osmolytes and secondary metabolites.ResultsSalinity (100 mM NaCl) stress imparted deleterious effects on the chlorophyll and carotenoid synthesis as well as the photosynthetic efficiency. N supplementation resulted in increased photosynthetic rate, stomatal conductance and internal CO2 concentration with effects being much obvious in seedlings treated with higher N dose. Under non-saline conditions at both N levels, protease and lipoxygenase activity reduced significantly reflecting in reduced oxidative damage. Such effects were accompanied by reduced generation of toxic radicals like hydrogen peroxide and superoxide, and lipid peroxidation in N supplemented seedlings. Antioxidant defence system was up-regulated under saline and non-saline growth conditions due to N supplementation leading to protection of major cellular processes like photosynthesis, membrane structure and function, and mineral assimilation. Increased osmolyte and secondary metabolite accumulation, and redox components in N supplemented plants regulated the ROS metabolism and NaCl tolerance by further strengthening the antioxidant mechanisms.ConclusionsFindings of present study suggest that N availability regulated the salinity tolerance by reducing Na uptake and strengthening the key tolerance mechanisms.
Highlights
Salinity is one of the damaging abiotic stress factor
Nitrogen (N), a macroelement which is actively involved in regulation of enzyme activity, photosynthesis, protein synthesis, antioxidant and osmolyte metabolism [14,15,16]
Earlier Ahanger and Agarwal [1, 21] have reported that upregulated antioxidant and osmolyte metabolism prevents salinity and water stress mediated growth inhibition by protecting nitrogen and secondary metabolite metabolism
Summary
Salinity is one of the damaging abiotic stress factor. Proper management techniques have been proposed to considerably lower the intensity of salinity on crop growth and productivity. For assuaging the salinity mediated ROS-induced deleterious effects on growth the antioxidant system and osmoregulatory components are up-regulated [2] In addition to this salt exclusion at root and vacuole level is considered as an important key mechanism regulating tolerance in plants [10, 11]. The role of N availability in regulation of antioxidant, osmolyte and secondary metabolism under salinity stress remains to be least researched area It is with this backdrop we hypothesized that (a) whether N supplementation modulates antioxidant, osmolyte and secondary metabolite metabolism for enhancing the salinity tolerance, and (b) the effectivity of improved N supplementation in the alleviation of salinity mediated changes in growth and physio-biochemical attributes
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
