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Lingling Shang,Linda Gaudreau,Michèle Martel,Dominique Michaud,Steeve Pepin,André Gosselin 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.5
Plants are being recognized as promising hosts for molecular farming and several molecular tools have been developed over the last two decades to optimize recombinant protein yields. However, the effects of basic growth factors on protein yield have been much less studied. Here, we investigated the effects of supplemental light emitting diode (LED) inter-lighting, CO2enrichment, and plant density on growth and recombinant protein yield of Nicotiana benthamiana used as a host to express the vaccine antigen influenza virus hemagglutinin H1. LED inter-lighting improved plant growth and recombinant protein yield on a per-plant basis. CO2 enrichment also enhanced plant growth, but its effect on recombinant protein yield was not significant. By comparison, high plant density decreased recombinant protein production per plant, mainly because of its negative impact on protein accumulation on a per-plant basis. On a whole-crop area basis, supplemental lighting, CO2 enrichment, and high plant density improved plant growth, while only LED inter-lighting and high plant density positively impacted recombinant protein yield. We suggest that LED inter-lighting and an elevated plant density should be used to maximize H1 antigen yield in large-scale protein production systems using N. benthamiana.
Anick R. Fournier,John T.A. Proctor,Shahrokh Khanizadeh,André Gosselin,Martine Dorais 고려인삼학회 2008 Journal of Ginseng Research Vol.32 No.4
Forest-grown American ginseng (Panax quinquefolius L.) is exposed to daily and seasonal light variations. Our goal was to determine the effect of understory light changes on the maximum quantum yield of photosystem II, expressed as Fv/Fm, and photosynthetic pigment composition of two-year-old plants. Understory light photon flux density and sunfleck durations were characterized using hemispherical canopy photography. Our results showed that understory light significantly affected the Fv/Fm of American ginseng, especially during the initial development of the plants when light levels were the highest, averaging 28 mol m-2 d -1. Associated with low Fv / Fm during its initial development, American ginseng had the lowest levels of epoxidation state of the xanthophyll cycle of the season, suggesting an active dissipation of excess light energy absorbed by the chlorophyll pigments. As photon flux density decreased after the deployment of the forest canopy to less than 10 mol m-2 d -1, chlorophyll a/b decreased suggesting a greater investment in light harvesting pigments to reaction centers in order to absorb the fleeting light energy.
Fournier, Anick R.,Khanizadeh, Shahrokh,Gauthier, Louis,Gosselin, Andre,Dorais, Martine The Korean Society of Ginseng 2003 Journal of Ginseng Research Vol.27 No.4
Vesicular-arbuscular mycorrhizae (VAM) fungi naturally colonise American ginseng roots and this relationship is highly beneficial to enhance plant productivity. Our goal was to determine the effect of adding two Glomus species (Glomus etuticatum, G. intraradices) on survival, photosynthetic capacity, growth, morphology and root ginsenoside content of one-year-old American ginseng plants grown in a broadleaf forest. While our study revealed that VAM inoculations significantly affected root morphology and Re ginsenoside content, the survival, photosynthetic capacity and root growth of American ginseng plants were not significantly influenced by VAM inoculations. Surface area and volume of rootlets were 16-25% higher for ginseng grown in VAM-inoculated soil compared to those grown in the control plots. Also, Re ginsenoside content was 18 % higher in YAM-inoculated roots compared to controls.
Anick R. Fournier,Shahrokh Khanizadeh,Louis Gauthier,Andre Gosselin,Martine Dorais 고려인삼학회 2003 Journal of Ginseng Research Vol.27 No.4
Vesicular-arbuscular mycorrhizae (VAM) fungi naturally colonise American ginseng roots and this relationship is highly beneficial to enhance plant productivity. Our goal was to determine the effect of adding two Glomus species (Glomus etuticatum, G. intraradices) on survival, photosynthetic capacity, growth, morphology and root ginsenoside content of one-year-old American ginseng plants grown in a broadleaf forest. While our study revealed that VAM inoculations significantly affected root morphology and Re ginsenoside content, the survival, photosynthetic capacity and root growth of American ginseng plants were not significantly influenced by VAM inoculations. Surface area and volume of rootlets were 16-25% higher for ginseng grown in VAM-inoculated soil compared to those grown in the control plots. Also, Reginsenoside content was 18 % higher in VAM-inoculated roots compared to controls.
Fournier, Anick R.,T.A., John,Khanizadeh, Shahrokh,Gosselin, Andre,Dorais, Martine The Korean Society of Ginseng 2008 Journal of Ginseng Research Vol.32 No.4
Forest-grown American ginseng (Panax quinquefolius L.) is exposed to daily and seasonal light variations. Our goal was to determine the effect of understory light changes on the maximum quantum yield of photosystem II, expressed as $F_v/F_m$, and photosynthetic pigment composition of two-year-old plants. Understory light photon flux density and sunfleck durations were characterized using hemispherical canopy photography. Our results showed that understory light significantly affected the $F_v/F_m$ of American ginseng, especially during the initial development of the plants when light levels were the highest, averaging 28 mol $m^{-2}d^{-1}$. Associated with low $F_v/F_m$ during its initial development, American ginseng had the lowest levels of epoxidation state of the xanthophyll cycle of the season, suggesting an active dissipation of excess light energy absorbed by the chlorophyll pigments. As photon flux density decreased after the deployment of the forest canopy to less than 10 mol $m^{-2}d^{-1}$, chlorophyll a/b decreased suggesting a greater investment in light harvesting pigments to reaction centers in order to absorb the fleeting light energy.
Anick R. Fournier,John T.A. Proctor,Shahrokh Khanizadeh,Andre Gosselin,Martine Dorais 고려인삼학회 2008 Journal of Ginseng Research Vol.32 No.4
Forest-grown American ginseng (Panax quinquefolius L.) is exposed to daily and seasonal light variations. Our goal was to determine the effect of understory light changes on the maximum quantum yield of photosystem Ⅱ, expressed as Fv/Fm, and photosynthetic pigment composition of two-year-old plants. Understory light photon flux density and sunfleck durations were characterized using hemispherical canopy photography. Our results showed that understory light significantly affected the Fv/Fm of American ginseng, especially during the initial development of the plants when light levels were the highest, averaging 28 mol m<SUP>-2</SUP>d<SUP>-1</SUP>. Associated with low Fv/Fm during its initial development, American ginseng had the lowest levels of epoxidation state of the xanthophyll cycle of the season, suggesting an active dissipation of excess light energy absorbed by the chlorophyll pigments. As photon flux density decreased after the deployment of the forest canopy to less than 10 mol m<SUP>-2</SUP>d<SUP>-1</SUP>, chlorophyll a/b decreased suggesting a greater investment in light harvesting pigments to reaction centers in order to absorb the fleeting light energy.