en Essential Oil Compositions and Photosynthetic Pigments Content of <i>Pelargonium graveolens</i> in Response to Nanosilver Application فارماكوگنوزی و فارماسيوتيكس Pharmacognosy & Pharmaceutics پژوهشی Research <p dir="ltr" style="text-align: justify;"><strong>Background:</strong> Nanosilver particles are among the potentially candidates for modulating the redox status and changing the growth, performance and quality of plants because of their physicochemical characteristics.</p> <p dir="ltr" style="text-align: justify;"><strong>Objective:</strong> This study was carried out to elucidate the potential effects of nanosilver particles application on variations of photosynthetic pigments (chlorophyll and carotenoids) and essential oil content and composition of <i>Pelargonium graveolens</i>.</p> <p dir="ltr" style="text-align: justify;"><strong>Methods:</strong> Four nanosilver particles (5 - 20 nm) concentration (0, 20, 40, and 80 mg.L^-1) were used as foliar application. The essential oils were isolated from aerial flowering parts of the plants by hydro-distillation method and then subjected to GC and GC-MS apparatus to determine the oil constituents.</p> <p dir="ltr" style="text-align: justify;"><strong>Results:</strong> Chlorophyll and carotenoids content increased in leaves of nanosilver treated plants in compare with the control. Nanosilver application at 40 mg.L^-1 was the most effective treatments in pigments and essential oil content. Also, results showed that 26 components were identified in essential oil and citronellol was the major component under all employed treatments. Maximum citronellol/geraniol ratio was obtained at 80 mg.L^-1 nanosilver treatment, indicating the positive influence of nanosilver particles on essential oil quality of <i>Pelargonium</i> plants.</p> <div dir="ltr" style="text-align: justify;"><strong>Conclusion:</strong> The nanosilver particles application could maintain and enhanced the photosynthetic pigments and essential oil content of <i>P. graveolens</i> plants. Our findings suggested that nanosilver application improved quality and quantity of essential oil.</div> <p dir="ltr" style="text-align: justify;"><strong>Background:</strong> Nanosilver particles are among the potentially candidates for modulating the redox status and changing the growth, performance and quality of plants because of their physicochemical characteristics.</p> <p dir="ltr" style="text-align: justify;"><strong>Objective:</strong> This study was carried out to elucidate the potential effects of nanosilver particles application on variations of photosynthetic pigments (chlorophyll and carotenoids) and essential oil content and composition of <i>Pelargonium graveolens</i>.</p> <p dir="ltr" style="text-align: justify;"><strong>Methods:</strong> Four nanosilver particles (5 - 20 nm) concentration (0, 20, 40, and 80 mg.L^-1) were used as foliar application. The essential oils were isolated from aerial flowering parts of the plants by hydro-distillation method and then subjected to GC and GC-MS apparatus to determine the oil constituents.</p> <p dir="ltr" style="text-align: justify;"><strong>Results:</strong> Chlorophyll and carotenoids content increased in leaves of nanosilver treated plants in compare with the control. Nanosilver application at 40 mg.L^-1 was the most effective treatments in pigments and essential oil content. Also, results showed that 26 components were identified in essential oil and citronellol was the major component under all employed treatments. Maximum citronellol/geraniol ratio was obtained at 80 mg.L^-1 nanosilver treatment, indicating the positive influence of nanosilver particles on essential oil quality of <i>Pelargonium</i> plants.</p> <div dir="ltr" style="text-align: justify;"><strong>Conclusion:</strong> The nanosilver particles application could maintain and enhanced the photosynthetic pigments and essential oil content of <i>P. graveolens</i> plants. Our findings suggested that nanosilver application improved quality and quantity of essential oil.</div> ,Pelargonium graveolens, Carotenoids, Citronellol, Essential oil Chlorophyll, Nanosilver Pelargonium graveolens, Carotenoids, Citronellol, Essential oil Chlorophyll, Nanosilver 5 14 http://jmp.ir/browse.php?a_code=A-10-63-1&slc_lang=en&sid=1 M Hatami M Hatami Hatamimehrnaz@yahoo.com 100319475328460041923 100319475328460041923 Yes Department of Medicinal Plants, Faculty of Agriculture and Natural Resources, Arak University, Arak, Iran Department of Medicinal Plants, Faculty of Agriculture and Natural Resources, Arak University, Arak, Iran R Ghafarzadegan R Ghafarzadegan 100319475328460041924 100319475328460041924 No Medicinal Plants Research Center, Institute of Medicinal Plants, ACECR, Karaj, Iran Medicinal Plants Research Center, Institute of Medicinal Plants, ACECR, Karaj, Iran M Ghorbanpour M Ghorbanpour 100319475328460041925 100319475328460041925 No Department of Medicinal Plants, Faculty of Agriculture and Natural Resources, Arak University, Arak, Iran Department of Medicinal Plants, Faculty of Agriculture and Natural Resources, Arak University, Arak, Iran