TY - T1 - Positive pressure in xylem and its role in hydraulic function SN - / UR - http://hdl.handle.net/10138/336474 T3 - A1 - Schenk, H. Jochen; Jansen, Steven; Hölttä, Teemu A2 - PB - Y1 - 2021 LA - eng AB - Although transpiration-driven transport of xylem sap is well known to operate under absolute negative pressure, many terrestrial, vascular plants show positive xylem pressure above atmospheric pressure on a seasonal or daily basis, or during early developmental stages. The actual location and mechanisms behind positive xylem pressure remain largely unknown, both in plants that show seasonal xylem pressure before leaf flushing, and those that show a diurnal periodicity of bleeding and guttation. ... VO - IS - SP - OP - KW - bleeding; diurnal pressure; embolism refilling; guttation; rehydration; root pressure; seasonal pressure; stem pressure; MEMBRANE H+-ATPASE; STEM WATER-CONTENT; VESSEL-ASSOCIATED CELLS; FREEZE-THAW CYCLES; ROOT-PRESSURE; WINTER EMBOLISM; CONDUCTIVITY RECOVERY; SAP FLOW; REFLECTION COEFFICIENT; AQUAPORIN EXPRESSION; 11831 Plant biology N1 - PP - ER -