This study was carried out to get information on the cause of low photosynthesis ofKorean ginseng, a shade plant. Photosynthesis, water content, stomatal conductance and water potential in leaves of ginseng and soybean were investigated. The light intensity for maximum photosynthesis was about ...
This study was carried out to get information on the cause of low photosynthesis ofKorean ginseng, a shade plant. Photosynthesis, water content, stomatal conductance and water potential in leaves of ginseng and soybean were investigated. The light intensity for maximum photosynthesis was about $300{\mu}E\;/\;m^2\;/\;s^2$ in ginseng and about $800{\mu}E\;/\;m^2\;/\;s^2$ in soybean, respectively Photosynthesis was remarkably lower in ginseng than in soybean under the same light intensity and $temperature(at\;20^{\circ}C)$. Photosynthesis of detached leaves was stopped in shorter time in ginseng than in soybean particularly at high $temperature(30^{\circ}C)$. The decreasing rate of water content in detached leaves was slower in ginseng than that of soybean, while the remained water level in the leaves was much higher in $ginseng(70{\sim}71%)\;than\;in\;soybean(50{\sim}53%)$ when photosynthesis was stopped. Water content had a positive correlationwith photosynthesis in both plants. However, at the same water level, the ratio of photosynthesis to water content was remarkably lower in ginseng than In soybean. The relationship between the stomatal conductance and photosynthesis was significantly positive correlation in the both plants. The ratio of photosynthesis to stomatal conductance was similar in booth plants below about 40 $mmol\;/\;m^2\;/\;s\;at\;20^{\circ}C$. Water potential was remarkably lower in ginseng than in soybean, and waterpotential had a significantly positive correlation with water content, stomatal conductance and photosynthesis in both plant. These results suggested that the low stomatal conductance and low water potential might cause the low photosynthesis in ginseng compared to soybean.
This study was carried out to get information on the cause of low photosynthesis ofKorean ginseng, a shade plant. Photosynthesis, water content, stomatal conductance and water potential in leaves of ginseng and soybean were investigated. The light intensity for maximum photosynthesis was about $300{\mu}E\;/\;m^2\;/\;s^2$ in ginseng and about $800{\mu}E\;/\;m^2\;/\;s^2$ in soybean, respectively Photosynthesis was remarkably lower in ginseng than in soybean under the same light intensity and $temperature(at\;20^{\circ}C)$. Photosynthesis of detached leaves was stopped in shorter time in ginseng than in soybean particularly at high $temperature(30^{\circ}C)$. The decreasing rate of water content in detached leaves was slower in ginseng than that of soybean, while the remained water level in the leaves was much higher in $ginseng(70{\sim}71%)\;than\;in\;soybean(50{\sim}53%)$ when photosynthesis was stopped. Water content had a positive correlationwith photosynthesis in both plants. However, at the same water level, the ratio of photosynthesis to water content was remarkably lower in ginseng than In soybean. The relationship between the stomatal conductance and photosynthesis was significantly positive correlation in the both plants. The ratio of photosynthesis to stomatal conductance was similar in booth plants below about 40 $mmol\;/\;m^2\;/\;s\;at\;20^{\circ}C$. Water potential was remarkably lower in ginseng than in soybean, and waterpotential had a significantly positive correlation with water content, stomatal conductance and photosynthesis in both plant. These results suggested that the low stomatal conductance and low water potential might cause the low photosynthesis in ginseng compared to soybean.
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