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@article{1603776, author = {Jupa, Radek and Doubková, Pavlína and Gloser, Vít}, article_location = {Oxford, UK}, article_number = {8}, doi = {http://dx.doi.org/10.1093/treephys/tpz035}, keywords = {branch; hydraulic conductivity; ionic effect; parenchyma; vessel; water potential; wood porosity; xylem anatomy}, language = {eng}, issn = {0829-318X}, journal = {Tree physiology}, title = {Ion-mediated increases in xylem hydraulic conductivity: seasonal differences between coexisting ring- and diffuse-porous temperate tree species}, url = {https://academic.oup.com/treephys/article-abstract/39/8/1313/5425283?redirectedFrom=fulltext}, volume = {39}, year = {2019} }
TY - JOUR ID - 1603776 AU - Jupa, Radek - Doubková, Pavlína - Gloser, Vít PY - 2019 TI - Ion-mediated increases in xylem hydraulic conductivity: seasonal differences between coexisting ring- and diffuse-porous temperate tree species JF - Tree physiology VL - 39 IS - 8 SP - 1313-1328 EP - 1313-1328 PB - Oxford University Press SN - 0829318X KW - branch KW - hydraulic conductivity KW - ionic effect KW - parenchyma KW - vessel KW - water potential KW - wood porosity KW - xylem anatomy UR - https://academic.oup.com/treephys/article-abstract/39/8/1313/5425283?redirectedFrom=fulltext L2 - https://academic.oup.com/treephys/article-abstract/39/8/1313/5425283?redirectedFrom=fulltext N2 - Ion-mediated changes in hydraulic conductivity (Delta K-h) represent a mechanism allowing plants to regulate the rate of xylem transport. However, the significance of Delta K-h for ring-porous (RPS) and diffuse-porous tree species (DPS) remains unknown. Here, we examined Delta K-h in young branches of three coexisting, temperate RPS (Fraxinus excelsior, Quercus robur, Robinia pseudoacacia) and three DPS (Acer pseudoplatanus, Carpinus betulus, Fagus sylvatica) across the whole year, and assessed the relationships of Delta K-h to branch anatomy. Ring-porous species exhibited twice as high Delta K-h (10.3% vs 5.3%) within the growing season (i.e., during wood production) compared with DPS, and the production of the annual ring was identified as a crucial process affecting maximum Delta K-h within the season. In addition, xylem in branches of RPS generally contained more axial parenchyma (AP; 18% vs 7%) and was characterized by a greater relative contact fraction between vessels and parenchyma (FVP; 59% vs 18%) than xylem in DPS. Simultaneously, Delta K-h measured within the growing season was positively correlated with AP, FVP and bark proportions, suggesting that parenchyma in branches may be important for high Delta K-h. Significant increase in Delta K-h observed during the growing season may help RPS to restore conductive capacity after winter, better compensate transport loss by drought-induced embolism and thereby improve water delivery to leaves. ER -
JUPA, Radek, Pavlína DOUBKOVÁ and Vít GLOSER. Ion-mediated increases in xylem hydraulic conductivity: seasonal differences between coexisting ring- and diffuse-porous temperate tree species. \textit{Tree physiology}. Oxford, UK: Oxford University Press, 2019, vol.~39, No~8, p.~1313-1328. ISSN~0829-318X. Available from: https://dx.doi.org/10.1093/treephys/tpz035.
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