The effects of pre- and post-veraison water stress on growth and physiology of potted Pinot Noir grapevines at varying crop levels

Authors

  • S. Poni
  • A. N. Lakso
  • J. R. Turner
  • R. E. Melious

DOI:

https://doi.org/10.5073/vitis.1993.32.207-214

Keywords:

Vitis vinifera L., crop level, water stress, photosynthesis, berry growth, berry ripening

Abstract

The interactions of water stress timing and crop level on growth, gas exchange, water relations and ripening of potted Pinot Noir grapevines were examined. Pre-veraison water stress induced a greater reduction of shoot and berry growth and a more rapid limitation of net photosynthesis (Pn) and stomatal conductance (g(s)) as compared to post-veraison stress. At the end of stress, when mid-day and pre-dawn leaf water potential were below -1.1 and -0.6 MPa, the reduction in Pn of stressed vines was more marked in the 2- and 4-cluster plants versus 1-cluster plant. Crop level had almost no significant effects on gas-exchange, growth and ripening and but few interactions with timing of water stress. These responses seem to reflect the high leaf area-to-fruit ratios at each crop level which probably buffered the effects of reduced leaf function induced by water stress.

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Published

2015-09-02

Issue

Vol. 32 No. 4 (1993): Vitis

Section

Article

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