title: Daytime and nighttime wind differentially affects hydraulic properties and thigmomorphogenic response of poplar saplings.
abstract: This study tested how wind in daytime and nighttime affects hydraulic properties and thigmomorphogenic response of poplar saplings. It shows that wind in daytime interrupted water balance of poplar plants by aggravating cavitation in the stem xylem under high xylem tension in the daytime, reducing water potential in midday and hence reducing gas exchange, including stomatal conductance and CO2 assimilation. The wind blowing in daytime significantly reduced plant growth, including height, diameter, leaf size, leaf area, root and whole biomass, whereas wind blowing in nighttime only caused a reduction in radial and height growth at the early stage compared with the control but decreased height:diameter ratios. In summary, the interaction between wind loading and xylem tension exerted a negative impact on water balance, gas exchanges and growth of poplar plants, and wind in nighttime caused only a small thigmomorphogenic response.
authors.affiliation: Institute of New Forestry Technology, Chinese Academy of Forestry, Beijing 100091, P. R. China.
authors.forename: Ping
authors.initials: P
authors.lastname: Huang
authors.affiliation: Institute of New Forestry Technology, Chinese Academy of Forestry, Beijing 100091, P. R. China.
authors.forename: Xianchong
authors.initials: X
authors.lastname: Wan
authors.affiliation: Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2H1, Canada.
authors.forename: Victor J
authors.initials: VJ
authors.lastname: Lieffers
mesh_terms: D018533:Biomass; D018515:Plant Leaves / Q000502:physiology; D018517:Plant Roots; D018547:Plant Stems / Q000502:physiology; D018526:Plant Transpiration / Q000502:physiology*; D032107:Populus / Q000502:physiology*; D014867:Water / Q000502:physiology*; D014919:Wind; D052584:Xylem / Q000502:physiology
chemical_list: D014867:Water