Vine and soil-based measures of water status in Tempranillo vineyard
Seasonal changes of leaf and stem water potential and midday stomatal conductance (gs) of Tempranillo grapevines were determined in irrigated and non-irrigated vines in 2003 and 2004. Leaf water potential was measured at pre-dawn (Ψpd) and at midday (Ψl md), while stem water potential was meas...
| Autores principales: | , |
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| Formato: | article |
| Lenguaje: | Inglés |
| Publicado: |
Institut für Rebenzüchtung Geilweilerhof (Institute of Grapevine Breeding Geilweilerhof)
2020
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.11939/6391 https://ojs.openagrar.de/index.php/VITIS/search |
| Sumario: | Seasonal changes of leaf and stem water potential
and midday stomatal conductance (gs) of Tempranillo
grapevines were determined in irrigated and non-irrigated
vines in 2003 and 2004. Leaf water potential was
measured at pre-dawn (Ψpd) and at midday (Ψl
md), while
stem water potential was measured in the early morning
(Ψs
em) and at midday (Ψs
md). At Ψpd to -0.54 MPa
rain-fed and irrigated vines had similar midday Ψl and
Ψs. This was due to both, stomatal closure and reduction
of leaf area. Under these conditions, Ψpd and Ψs
em
were better water stress indicators than midday Ψ. In
both years a close correlation was found between Ψpd
and Ψs
em. However, for a given Ψpd, Ψs
em of vines was
lower in 2004 than in 2003. This was probably due to
the larger leaf area developed by vines in 2004. Stomatal
conductance reflected reasonably well differences in
the vine water status but its variability was much higher
than that of Ψ. Moreover, the afternoon depression of
stomatal conductance observed even in irrigated plots,
indicates that measuring gs early in the morning is
more convenient when assessing different treatments. |
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