Concomitant measurements of stem sap flow and leaf turgor pressure in olive trees using the leaf patch clamp pressure probe
C.M. Rodriguez-Dominguez,
W. Ehrenberger,
C. Sann,
S. Rüger,
V. Sukhorukov,
M.J. Martín-Palomo,
A. Diaz-Espejo,
M.V. Cuevas,
J.M. Torres-Ruiz,
A. Perez-Martin,
U. Zimmermann and
J.E. Fernández
Agricultural Water Management, 2012, vol. 114, issue C, 50-58
Abstract:
Stem sap flow (Q) and leaf turgor pressure (Pc) were measured simultaneously on 4-year-old, 2.4m tall ‘Arbequina’ olive trees in a hedgerow orchard. Measurements were performed on well-watered control trees as well as on 60RDI and 30RDI trees (RDI=regulated deficit irrigation). The 60RDI trees received 59.2% of the crop water needs (ETc), and the 30RDI trees received 29.4% of ETc. Pc was determined non-invasively using the magnetic leaf patch clamp pressure probe (ZIM probe). The patch pressure Pp measured by the probe is inversely correlated with turgor pressure at Pc>ca. 50kPa. Pc is coupled with xylem pressure; thus Pp yields information about the development of tension in xylem. In the case of the control trees a positive correlation between Q and Pp was generally found, i.e. Q increased usually with increasing Pp and decreased with decreasing Pp, as expected. However, Q peaking did not always coincided with Pp peaking at noon. Occasionally, Q peaking preceded or followed Pp peaking with a time difference of up to 3h in both cases. Under some circumstances, the onset of Q after sunrise was greatly delayed, even though a pronounced increase of Pp was observed. A delayed onset of Q after sunrise resulted in hysteresis phenomena, i.e. the linear increase of Q and Pp in the morning hours did not coincide with the corresponding decrease of Q and Pp in the afternoon. The development of severe water stress (PcKeywords: Irrigation scheduling; Water consumption; Water status; Xylem; Hydraulic resistance (search for similar items in EconPapers)
Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:114:y:2012:i:c:p:50-58
DOI: 10.1016/j.agwat.2012.07.007
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