Response of sorghum genotypes to water deficit stress under different CO2 and nitrogen levels

Plant Physiology and Biochemistry : PPB
Marzieh Asadi, Hamid Reza Eshghizadeh

Abstract

An open-top chamber experiment was conducted in the present study to investigate the growth and biochemical responses of six sorghum genotypes under two irrigation regimes (based on 40% and 75% soil-water depletion) and two N fertilizer levels (0 and 105 kgN ha-1), at two atmospheric CO2 conditions (390 ± 50 and 700 ± 50 μmol mol-1). The results revealed that water limited stress decreased the plant dry weight by reducing the plant leaf area, SPAD value, Fv/Fm, leaf RWC and membrane stability index (MSI), while it increased the specific activity of APX, CAT and POX enzymes, DPPH, LPC, Phe, TSC, H2O2, MDA and EL. The lowest decrease of the plant dry weight due to limited water stress was observed in the GS5 genotype, which was followed by the lowest decrease in the leaf RWC and MSI; also, the highest increase was seen in APX, Phe and TSC, while the lowest one was recorded in EL. Elevated CO2 improved DPPH and Phe under both control and water limited conditions, resulting in the decrease of APX, POX, H2O2 and EL, while a more pronounced effect was observed in the stress conditions. Furthermore, with the application of nitrogen, the reduction in DPPH, H2O2 and MDA values was greater under water limited stress rather than control c...Continue Reading

References

Nov 20, 2008·Journal of Integrative Plant Biology·Dan WangE William Hamilton
Jun 17, 2011·Journal of Plant Physiology·Leon Hartwell AllenKenneth J Boote
Jan 13, 2015·Plant Science : an International Journal of Experimental Plant Biology·Hamada AbdElgawadHan Asard
Jun 18, 2019·Plant Science : an International Journal of Experimental Plant Biology·Ping LiXingyu Hao

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