Seasonal variations in water relations in current-year leaves of evergreen trees with delayed gre... more Seasonal variations in water relations in current-year leaves of evergreen trees with delayed greening
Proceedings of the Royal Society B: Biological Sciences, 2019
The density and architecture of leaf veins determine the network and efficiency of water transpor... more The density and architecture of leaf veins determine the network and efficiency of water transport within laminae and resultant leaf gas exchange and vary widely among plant species. Leaf hydraulic conductance ( K leaf ) can be regulated by vein architecture in conjunction with the water channel protein aquaporin. However, our understanding of how leaf veins and aquaporins affect leaf hydraulics and stomatal conductance ( g s ) remains poor. By inducing blockage of the major veins and inhibition of aquaporin activity using HgCl 2 , we examined the effects of major veins and aquaporins on K leaf and g s in species with different venation types. A vine species, with thick first-order veins and low vein density, displayed a rapidly declined g s with high leaf water potential in response to vein blockage and a greatly reduced K leaf and g s in response to aquaporin inhibition, suggesting that leaf aquaporins are involved in isohydric/anisohydric stomatal behaviour. Across species, the d...
Understanding plant response to excessive light energy not consumed by photosynthesis under vario... more Understanding plant response to excessive light energy not consumed by photosynthesis under various environmental stresses, would be important for maintaining biosphere sustainability. Based on previous studies regarding nitrogen (N) limitation, drought in Japanese white birch (Betula platyphylla var. japonica), and elevated O3 in Japanese oak (Quercus mongolica var. crispula) and Konara oak (Q. serrata) under future-coming elevated CO2 concentrations, we newly analyze the fate of absorbed light energy by a leaf, partitioning into photochemical processes, including photosynthesis, photorespiration and regulated and non-regulated, non-photochemical quenchings. No significant increases in the rate of non-regulated non-photochemical quenching (JNO) were observed in plants grown under N limitation, drought and elevated O3 in ambient or elevated CO2. This suggests that the risk of photodamage caused by excessive light energy was not increased by environmental stresses reducing photosynth...
Seasonal variations in water relations in current-year leaves of evergreen trees with delayed gre... more Seasonal variations in water relations in current-year leaves of evergreen trees with delayed greening
Proceedings of the Royal Society B: Biological Sciences, 2019
The density and architecture of leaf veins determine the network and efficiency of water transpor... more The density and architecture of leaf veins determine the network and efficiency of water transport within laminae and resultant leaf gas exchange and vary widely among plant species. Leaf hydraulic conductance ( K leaf ) can be regulated by vein architecture in conjunction with the water channel protein aquaporin. However, our understanding of how leaf veins and aquaporins affect leaf hydraulics and stomatal conductance ( g s ) remains poor. By inducing blockage of the major veins and inhibition of aquaporin activity using HgCl 2 , we examined the effects of major veins and aquaporins on K leaf and g s in species with different venation types. A vine species, with thick first-order veins and low vein density, displayed a rapidly declined g s with high leaf water potential in response to vein blockage and a greatly reduced K leaf and g s in response to aquaporin inhibition, suggesting that leaf aquaporins are involved in isohydric/anisohydric stomatal behaviour. Across species, the d...
Understanding plant response to excessive light energy not consumed by photosynthesis under vario... more Understanding plant response to excessive light energy not consumed by photosynthesis under various environmental stresses, would be important for maintaining biosphere sustainability. Based on previous studies regarding nitrogen (N) limitation, drought in Japanese white birch (Betula platyphylla var. japonica), and elevated O3 in Japanese oak (Quercus mongolica var. crispula) and Konara oak (Q. serrata) under future-coming elevated CO2 concentrations, we newly analyze the fate of absorbed light energy by a leaf, partitioning into photochemical processes, including photosynthesis, photorespiration and regulated and non-regulated, non-photochemical quenchings. No significant increases in the rate of non-regulated non-photochemical quenching (JNO) were observed in plants grown under N limitation, drought and elevated O3 in ambient or elevated CO2. This suggests that the risk of photodamage caused by excessive light energy was not increased by environmental stresses reducing photosynth...
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Papers by Hisanori HARAYAMA