چکیده
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Sodium nitroprusside (SNP) and hydrogen peroxide (H2O2), as priming agents,
have the well-recorded property to increase plant tolerance against a range of
different abiotic stresses such as salinity. In this regard, the present study was
conducted to evaluate the effect of different levels of SNP (100 and 200 μM)
andH2O2 (2.5 and 5 mM) aswell as their combinations under salt stress (0 and
50mM NaCl) on key physiological and biochemical attributes of the economically
important aromatic plant basil (Ocimum basilicum L.) grown under
hydroponic culture. Results revealed that morphological parameters such as
plant height, root length, leaf fresh and dry weights (FW and DW) were significantly
decreased by salinity stress, while SNP and H2O2 treatments, alone or
combined, increased FW andDWthus enhancing plant tolerance to salt stress.
Furthermore, 200 μM SNP+2.5mM H2O2 appeared to be the most effective
treatment by causing significant increase in chlorophyll a and b, anthocyanin
content and guaiacol peroxidase and ascorbate peroxidase enzymes activities
under saline condition. In addition, analytical measurements showed
that essential oil profile (concentration of main components) under salt stress
was mostly affected by SNP and H2O2 treatments. The highest increase was
observed for methyl chavicol (43.09–69.91%), linalool (4.8–17.9%), cadinol
(1.5–3.2%) and epi-𝛼-cadinol (0.18–10.75%) compounds. In conclusion,
current findings demonstrated a positive crosstalk between SNP and H2O2
toward improved basil plant
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