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JXB Advance Access originally published online on July 7, 2009
Journal of Experimental Botany 2009 60(13):3751-3763; doi:10.1093/jxb/erp217
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© 2009 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Does night-time transpiration contribute to anisohydric behaviour in a Vitis vinifera cultivar?

Suzy Y. Rogiers*, Dennis H. Greer, Ron J. Hutton and Joe J. Landsberg

National Wine and Grape Industry Centre, NSW Department of Primary Industries and Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia

* To whom correspondence should be addressed: E-mail: suzy.rogiers{at}dpi.nsw.gov.au

The hypothesis that vines of the Semillon wine grape variety show anisohydric behaviour was tested, i.e. that tissue hydration is unstable under fluctuating environmental conditions. Stomatal conductance and transpiration rates from leaves were measured during the day and at night. Leaf water potential ({Psi}l) in Semillon was negatively correlated to vapour pressure deficit (VPD) both predawn and during the day. Furthermore, {Psi}l fell to significantly lower values than in any of the nine other varieties examined. Night-time values of stomatal conductance (gn) and transpiration (En) in Semillon were up to four times higher than in other varieties; plants enclosed in plastic bags overnight to reduce En resulted in better plant–soil equilibration so that predawn {Psi}l in Semillon was the same as in Grenache. These data indicate that the hypothesis is supported, and that night-time transpiration contributes significantly to the low {Psi}l values in Semillon during warm, dry nights. The other contributing factor is daytime stomatal conductance (gday), which in Semillon leaves was higher than in other varieties, although the decline in gday with increasing VPD was greater in Semillon than in Shiraz or Grenache. The high values of gday were associated with high rates of transpiration (Eday) by Semillon through a day when VPD reached 4.5 kPa. When compared to other varieties, Semillon was not unusual in terms of root length density, stomatal density, xylem sap abscisic acid, or leaf electrolyte leakage. Night-time and daytime water loss and insufficient stomatal regulation therefore account for the tendency to anisohydric behaviour shown by Semillon.

Key words: Drought responses, evaporative demand, Semillon, stomatal regulation, water relations

Received 9 March 2009; Revised 5 June 2009 Accepted 15 June 2009


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