Research Commons
      • Browse 
        • Communities & Collections
        • Titles
        • Authors
        • By Issue Date
        • Subjects
        • Types
        • Series
      • Help 
        • About
        • Collection Policy
        • OA Mandate Guidelines
        • Guidelines FAQ
        • Contact Us
      • My Account 
        • Sign In
        • Register
      View Item 
      •   Research Commons
      • University of Waikato Research
      • Science and Engineering
      • Science and Engineering Papers
      • View Item
      •   Research Commons
      • University of Waikato Research
      • Science and Engineering
      • Science and Engineering Papers
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Hydraulic responses of whole vines and individual roots of kiwifruit (Actinidia chinensis) following root severance

      Black, Marykate Z.; Patterson, Kevin J.; Minchin, Peter E.H.; Gould, Kevin S.; Clearwater, Michael J.; Meinzer, Frederick
      DOI
       10.1093/treephys/tpr045
      Link
       treephys.oxfordjournals.org
      Find in your library  
      Citation
      Export citation
      Black, M.Z., Patterson, K.J., Minchin, P.E.H., Gould, K.S., Clearwater, M.J. & Meinzer, F. (2011). Hydraulic responses of whole vines and individual roots of kiwifruit (Actinidia chinensis) following root severance. Tree Physiol, 31(5), 508-518.
      Permanent Research Commons link: https://hdl.handle.net/10289/5502
      Abstract
      Whole vine (Kplant) and individual root (Kroot) hydraulic conductances were measured in kiwifruit (Actinidia chinensis Planch. var. chinensis ‘Hort16A’) vines to observe hydraulic responses following partial root system excision. Heat dissipation and compensation heat pulse techniques were used to measure sap flow in trunks and individual roots, respectively. Sap flux and measurements of xylem pressure potential (Ψ) were used to calculate Kplant and Kroot in vines with zero and ∼80% of roots severed. Whole vine transpiration (E), Ψ and Kplant were significantly reduced within 24 h of root pruning, and did not recover within 6 weeks. Sap flux in intact roots increased within 24 h of root pruning, driven by an increase in the pressure gradient between the soil and canopy and without any change in root hydraulic conductance. Photosynthesis (A) and stomatal conductance (gs) were reduced, without significant effects on leaf internal CO2 concentration (ci). Shoot growth rates were maintained; fruit growth and dry matter content were increased following pruning. The woody roots of kiwifruit did not demonstrate a rapid dynamic response to root system damage as has been observed previously in monocot seedlings. Increased sap flux in intact roots with no change in Kroot and only a moderate decline in shoot A suggests that under normal growing conditions root hydraulic conductance greatly exceeds requirements for adequate shoot hydration.
      Date
      2011
      Type
      Journal Article
      Publisher
      Oxford University Press
      Collections
      • Science and Engineering Papers [3122]
      Show full item record  

      Usage

       
       
       

      Usage Statistics

      For this itemFor all of Research Commons

      The University of Waikato - Te Whare Wānanga o WaikatoFeedback and RequestsCopyright and Legal Statement