The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Wataru Yamori - One of the best experts on this subject based on the ideXlab platform.
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increased stomatal conductance induces rapid changes to Photosynthetic Rate in response to naturally fluctuating light conditions in rice
Plant Cell and Environment, 2020Co-Authors: Wataru Yamori, Kensuke Kusumi, Koh Iba, Ichiro TerashimaAbstract:A close correlation between stomatal conductance and the steady-state Photosynthetic Rate has been observed for diverse plant species under various environmental conditions. However, it remains unclear whether stomatal conductance is a major limiting factor for the Photosynthetic Rate under naturally fluctuating light conditions. We analysed a SLAC1 knockout rice line to examine the role of stomatal conductance in Photosynthetic responses to fluctuating light. SLAC1 encodes a stomatal anion channel that regulates stomatal closure. Long exposures to weak light before treatments with strong light increased the Photosynthetic induction time required for plants to reach a steady-state Photosynthetic Rate and also induced stomatal limitation of photosynthesis by restricting the diffusion of CO2 into leaves. The slac1 mutant exhibited a significantly higher Rate of stomatal opening after an increase in irradiance than wild-type plants, leading to a higher Rate of Photosynthetic induction. Under natural conditions, in which irradiance levels are highly variable, the stomata of the slac1 mutant remained open to ensure efficient Photosynthetic reaction. These observations reveal that stomatal conductance is important for regulating photosynthesis in rice plants in the natural environment with fluctuating light.
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effects of internal conductance on the temperature dependence of the Photosynthetic Rate in spinach leaves from contrasting growth temperatures
Plant and Cell Physiology, 2006Co-Authors: Wataru Yamori, Ko Noguchi, Yuko T Hanba, Ichiro TerashimaAbstract:The Photosynthetic Rate may be strongly limited by internal conductance from the intercellular airspace to the chloroplast stroma (gi). However, the effects of growth and leaf temperature on gi are still unclarified. In this work, we determined the temperature dependence of gi in spinach leaves grown at 30/258C (high temperature; HT) and 15/108C (low temperature; LT), using the concurrent measurements of the gas exchange Rate and stable carbon isotope ratio. Moreover, we quantified the effects of gi on the temperature dependence of the Photosynthetic Rate. We measured gi and the Photosynthetic Rate at a CO2 concentration of 360m ll � 1 under saturating light (A360) at different leaf temperatures. The optimum temperature for A360 was 28.58C in HT leaves and 22.98C in LT leaves. The optimum temperatures for gi were almost similar to those of A360 in both HT and LT leaves. There was a strong linear relationship between A360 and gi. The Photosynthetic Rates predicted from the C3 photosynthesis model taking account of gi agreed well with A360 in both HT and LT leaves. The temperature coefficients (Q10 )o fgi between 10 and 208C were 2.0 and 1.8 in HT and LT leaves, respectively. This suggests that gi was determined not only by physical diffusion but by processes facilitated by protein(s). The limitation of the Photosynthetic Rate imposed by gi increased with leaf temperature and was greater than the limitation of the stomatal conductance at any temperature, in both HT and LT leaves. This study suggests that gi substantially limits the Photosynthetic Rate, especially at higher temperatures.
Ichiro Terashima - One of the best experts on this subject based on the ideXlab platform.
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increased stomatal conductance induces rapid changes to Photosynthetic Rate in response to naturally fluctuating light conditions in rice
Plant Cell and Environment, 2020Co-Authors: Wataru Yamori, Kensuke Kusumi, Koh Iba, Ichiro TerashimaAbstract:A close correlation between stomatal conductance and the steady-state Photosynthetic Rate has been observed for diverse plant species under various environmental conditions. However, it remains unclear whether stomatal conductance is a major limiting factor for the Photosynthetic Rate under naturally fluctuating light conditions. We analysed a SLAC1 knockout rice line to examine the role of stomatal conductance in Photosynthetic responses to fluctuating light. SLAC1 encodes a stomatal anion channel that regulates stomatal closure. Long exposures to weak light before treatments with strong light increased the Photosynthetic induction time required for plants to reach a steady-state Photosynthetic Rate and also induced stomatal limitation of photosynthesis by restricting the diffusion of CO2 into leaves. The slac1 mutant exhibited a significantly higher Rate of stomatal opening after an increase in irradiance than wild-type plants, leading to a higher Rate of Photosynthetic induction. Under natural conditions, in which irradiance levels are highly variable, the stomata of the slac1 mutant remained open to ensure efficient Photosynthetic reaction. These observations reveal that stomatal conductance is important for regulating photosynthesis in rice plants in the natural environment with fluctuating light.
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effects of internal conductance on the temperature dependence of the Photosynthetic Rate in spinach leaves from contrasting growth temperatures
Plant and Cell Physiology, 2006Co-Authors: Wataru Yamori, Ko Noguchi, Yuko T Hanba, Ichiro TerashimaAbstract:The Photosynthetic Rate may be strongly limited by internal conductance from the intercellular airspace to the chloroplast stroma (gi). However, the effects of growth and leaf temperature on gi are still unclarified. In this work, we determined the temperature dependence of gi in spinach leaves grown at 30/258C (high temperature; HT) and 15/108C (low temperature; LT), using the concurrent measurements of the gas exchange Rate and stable carbon isotope ratio. Moreover, we quantified the effects of gi on the temperature dependence of the Photosynthetic Rate. We measured gi and the Photosynthetic Rate at a CO2 concentration of 360m ll � 1 under saturating light (A360) at different leaf temperatures. The optimum temperature for A360 was 28.58C in HT leaves and 22.98C in LT leaves. The optimum temperatures for gi were almost similar to those of A360 in both HT and LT leaves. There was a strong linear relationship between A360 and gi. The Photosynthetic Rates predicted from the C3 photosynthesis model taking account of gi agreed well with A360 in both HT and LT leaves. The temperature coefficients (Q10 )o fgi between 10 and 208C were 2.0 and 1.8 in HT and LT leaves, respectively. This suggests that gi was determined not only by physical diffusion but by processes facilitated by protein(s). The limitation of the Photosynthetic Rate imposed by gi increased with leaf temperature and was greater than the limitation of the stomatal conductance at any temperature, in both HT and LT leaves. This study suggests that gi substantially limits the Photosynthetic Rate, especially at higher temperatures.
Cao Hui - One of the best experts on this subject based on the ideXlab platform.
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Effect of Water Stress on Diurnal Changes of Photosynthetic Rate in Spur Apple Leaves
Journal of Shanxi Agricultural Sciences, 2000Co-Authors: Cao HuiAbstract:Effect of water stress on diurnal changes of Photosynthetic Rate in spur apple leaves were studied under pot cultivation in 1997～1998. It was found that water stress obviously changed Photosynthetic Rate diurnal curves. When“midday depression" occurred, the Photosynthetic Rate was limited firstly stomata, then by non-stomatic factors.
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Effects of Water stress in soil on Photosynthetic Rate of spur apple Trees
Journal of Shanxi Agricultural University, 2000Co-Authors: Cao HuiAbstract:Effects of water stress on Photosynthetic Rate of spur apple young trees were studied under pot cultivation. The result showed that the relative water content, water potential, singleleaf area, the chlorophyll content, stomatal resistance, transpiration, Photosynthetic Rate decreased. The range what Photosynthetic Rate decreased was mild, modeRate, severe water stress. Meanwhile, there was no significant difference between mild water stress and CK, there was significant difference between modeRate, severe water stress and CK.
Li Ping - One of the best experts on this subject based on the ideXlab platform.
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Studies on Photosynthetic Rate of Rice Germplasm Resources
Journal of Sichuan Agricultural University, 2007Co-Authors: Li PingAbstract:The measurement of 117 rice germplasm resources at different growing stages proved that the net Photosynthetic Rate(Pn) from initial heading to full heading stage was stable(Fig.1),which could be used to compare the varietal difference in Photosynthetic Rate.The result showed that different rice varieties had great difference in their Photosynthetic Rates(Table 1,2).The Photosynthetic Rate showed a normal distribution skewed(Fig.2).According to the result from clustering analysis,117 rice varieties were classified into five groups,i.e.very high,high,middle high,middle low,and low of Pn.The Photosynthetic Rates were close to or higher than 25 μmol/(m2·s) in 14 germplasm resources,which accounted for 11.97% of the total materials tested,including Indica rice Ainanzao,Teqing,Fulidao,Ai 50,Ketan Bajong,etc;Japonica rice Longdao,Longken 46 and Daoshaguang;and Oryza glaberrima Steud Rico-1.The results of the relationships between agronomic characters and Photosynthetic Rate showed that the resources with high Photosynthetic Rate have characteristics of green or dark green leaves,middle erective or nearly erective flag leaves and modeRate loose plant type(Table 3).
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Single Leaf Photosynthetic Rate of Rice Germplasm Resources
Acta Agronomica Sinica, 2006Co-Authors: Liu Huai, Li PingAbstract:The measurement of 117 rice germplasm resources at different growing stages proved that the net Photosynthetic Rate(P_n) from initial heading to full heading stage was stable(Fig.1),which could be need to compare the varietal difference in Photosynthetic Rate.The result showed that different rice varieties had great difference in their Photosynthetic Rates(Table 1,2).The Photosynthetic Rate showed a normal distribution skewed(Fig.2).According to the result from clustering analysis,117 rice varieties were classified into five groups,i.e.very high,high,middle high,middle low,and low of P_n.The Photosynthetic Rates were close to or higher than 25 μmol·m~(-2)·s~(-1) in 14 germplasm resources,which accounted for 11.97% of the total materials tested,including Indica rice Ainanzao,Teqing,Fulidao,Ai50,Ketan Bajong,etc;japonica rice Longdao,Longken 46 and Daoshaguang;and Oryza glaberrima Steud Rico-1.The results of the relationship between agronomic characters and Photosynthetic Rate showed that the resources with high Photosynthetic Rate have such characteristics as green or dark green leaves,middle erective or nearly erective flag leaves and modeRate loose plant type(Table 3).
Fekade S. Girma - One of the best experts on this subject based on the ideXlab platform.
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Leaf Photosynthetic Rate is correlated with biomass and grain production in grain sorghum lines
Photosynthesis Research, 1991Co-Authors: Shaobing Peng, Daniel R. Krieg, Fekade S. GirmaAbstract:Significant genetic variation in leaf Photosynthetic Rate has been reported in grain sorghum [ Sorghum biocolor (L.) Moench]. The relationships between leaf Photosynthetic Rates and total biomass production and grain yield remain to be established and formed the purpose of this experiment. Twenty two grain sorghum parent lines were tested in the field during the 1988 growing season under well-watered and water-limited conditions. Net carbon assimilation Rates were measured at mid-day during the 30 day period from panicle initiation to head exertion on upper-most fully expanded leaves using a portable photosynthesis system (LI-6200). Total biomass and grain production were determined at physiological maturity. The lines exhibited significant genetic variation in leaf Photosynthetic Rate, total biomass production and grain yield. Significant positive correlations existed between leaf photosynthesis and total biomass and grain production under both well-watered and water-limited conditions. The results suggest that leaf Photosynthetic Rate measured prior to flowering is a good indicator of productivity in grain sorghum.
