The variability in the xylem architecture of grapevine petiole and its contribution to hydraulic differences

Uri Hochberg, Asfaw Degu, Tanya Gendler, Aaron Fait, Shimon Rachmilevitch

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Grapevine cultivars possess large variability in their response to water availability, and are therefore considered as a good model to study plant hydraulic adjustments. The current research compared the petiole anatomy of two grapevine (Vitis vinifera L.) cultivars, Shiraz and Cabernet Sauvignon, in respect to hydraulic properties. Hydraulic differences between the cultivar petioles were tested over 3 years (2011-2013). Anatomical differences, hydraulic conductivity and embolism were tested under terminal drought conditions. Additionally, xylem differentiation under well watered (WW) and water deficit (WD) conditions was compared. Shiraz was shown to possess larger xylem vessels that resulted in a significantly higher theoretical specific hydraulic conductivity (Kts), leaf hydraulic conductivity (Kleaf) and maximal petiole hydraulic conductivity (Kpetiole). Under WD, smaller vessels were developed, more noticeably in Shiraz. Results confirmed a link between petiole hydraulic architecture and hydraulic behaviour, providing a simple mechanistic explanation for the higher transpiration rates commonly measured in Shiraz. Smaller xylem vessels in Cabernet Sauvignon could imply on its adaptation to WD, and explains its better performances under such conditions.

Original languageEnglish
Pages (from-to)357-365
Number of pages9
JournalFunctional Plant Biology
Volume42
Issue number4
DOIs
StatePublished - 1 Jan 2015

Keywords

  • Vitis vinifera
  • anatomy
  • anisohydric
  • embolism
  • hydraulic conductance
  • isohydric

ASJC Scopus subject areas

  • General Medicine

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