Partial drying of the rootzone of grape. I. Transient changes in shoot growth and gas exchange

Authors

  • P. R. Dry
  • B. R. Loveys
  • H. Düring

DOI:

https://doi.org/10.5073/vitis.2000.39.3-7

Keywords:

split-root, Vitis, half-drying, recovery, stomatal conductance, photosynthesis, shoot growth, drought stress

Abstract

Split-root  plants, where  the  root  system was  divided between  two containers, were used  to  study  the effect  of  partial  drying  of  the  root  system  on  shoot growth and gas exchange of Shiraz  (syn. Syrah)  (Vitis vinifera), Kober 5 BB  (Vitis berlandieri x Vitis  riparia) and 110 Richter (Vitis berlandieri x Vitis rupestris). The initial decrease  in both shoot growth rate and gas exchange  in  response  to half-drying  coincided with  the decrease  in  soil water content of  the dried half of  the root  system. Recovery  of  shoot  function  of half-dried grapevines  occurred without  rewatering  of  the dried half  of  the  root  system,  and  commenced when  there was no  further decrease  in  soil water  content. There was no effect of half-drying on  leaf water potential at the  times  of  greatest  inhibition  of  shoot  growth  rate and stomatal conductance relative to control; this suggests  the  involvement of a non-hydraulic  signal originating  from  the  roots  in drying  soil. Changes  in  stomatal  conductance  in  response  to  half-drying were strongly  correlated with  shoot  growth  rate.

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Published

2015-06-12

Issue

Vol. 39 No. 1 (2000): Vitis

Section

Article

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