چکیده
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The present study examined the effects of foliar spray of selenium nanoparticles (0, 10
and 20 mg/L) on the yield, phytochemicals and essential oil content and composition of pineapple
mint (Mentha suaveolens Ehrh.) under salinity stress (0, 30, 60 and 90 mM NaCl). Obtained results
demonstrated that severe salinity stress reduced the fresh weight (FW) and plant height (PH) by
16.40% and 19.10%, respectively compared with normal growth condition. On the other hands, under
sever salinity stress relative water content (RWC) and chlorophyll index were reduced by 18.05% and
3.50%, respectively. Interestingly, selenium nanoparticles (Se-NPs; 10 mg/L) application improved
the pineapple mint growth. Based on GC-FID and GC-MS analysis, 19 compounds were identified in
pineapple mint essential oil. Foliar application of Se-NPs and salinity did not change the essential oil
content of pineapple mint, however, the essential oil compounds were significantly affected by salinity
and Se-NPs- applications. Foliar application of Se-NPs- had a significant effect on piperitenone oxide,
limonene, jasmone, viridiflorol and b-myrsene under different salinity levels. The highest percentage
of piperitenone oxide (79.4%) as the major essential oil component was recorded in the no salinity
treatment by applying 10 mg/L of nanoparticle. Interestingly, application of 10 mg L1 Se-NPsunder
60 mM NaCl increased the piperitenone oxide content by 9.1% compared with non-sprayed
plants. Finally, the obtained results demonstrated that foliar application of Se-NPs (10 mg L1) can
improve the pineapple mint growth and secondary metabolites profile under saline conditions.
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