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Modelling the water transport dynamics in young navel orange trees budded on rootstocks commonly grown in northern Zimbabwe

S Dzikiti , JR Milford, Kathy Steppe UGent and Raoul Lemeur (2008) ACTA HORTICULTURAE. 803. p.259-264
abstract
Interpretation of the water relations of most citrus cultivars is difficult due to the occurrence of stomatal oscillations whose origin is not well known. These oscillations present sampling problems in water resource management in citrus orchards using discrete measurements of plant-based stress indicators. In this study we investigated the effect of two rootstocks commonly grown in northern Zimbabwe on the characteristics of the oscillations in Navel orange trees. This information was useful in deciding the optimal sampling frequency needed to obtain representative estimates of the plant water status. In addition, insights on the possible origin of the oscillations were also gained. The rootstocks comprised the rough lemon which is efficient in water uptake and produces drought tolerant trees and the troyer citrange which is less efficient in water uptake but it produces high quality fruit. Oscillations in sap flow, stem diameter and leaf water potential had sustained amplitudes and longer periods (>70 min) for orange trees budded on the troyer citrange rootstock, while trees on the rough lemon rootstock produced faster oscillations with diminishing amplitudes and short periods ranging from 35 to 55 min. A simple water balance model was used to describe the water relations of the trees budded on these two rootstocks. In this model, transpiration by the crown was used as the driving variable for stem sap flow, while the plant resistance (Rx) and capacitance (C) were parameter values obtained by model calibration. No significant differences in the estimates of Rx were found between the rootstocks, although this resistance appeared to change throughout the day. It is probable that the fluctuating resistance played a part in generating the stomatal oscillations through changes in the efficiency of water transport, which created transient internal water deficits in the leaves.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
in
ACTA HORTICULTURAE
Acta Hortic.
editor
J Samietz
volume
803
issue title
Proceedings of the eight international symposium on modelling in fruit research and orchard management
pages
259 - 264
publisher
International Society for Horticultural Science (ISHS)
place of publication
Leuven, Belgium
conference name
8th International symposium on Modelling in Fruit Research and Orchard Management
conference location
Einsiedeln, Switzerland
conference start
2007-07-01
conference end
2007-07-05
ISSN
0567-7572
ISBN
9789066056817
language
English
UGent publication?
yes
classification
C1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1006823
handle
http://hdl.handle.net/1854/LU-1006823
alternative location
http://www.actahort.org/books/803/803_33.htm
date created
2010-07-08 20:24:54
date last changed
2017-01-02 09:52:19
@inproceedings{1006823,
  abstract     = {Interpretation of the water relations of most citrus cultivars is difficult due to the occurrence of stomatal oscillations whose origin is not well known. These oscillations present sampling problems in water resource management in citrus orchards using discrete measurements of plant-based stress indicators. In this study we investigated the effect of two rootstocks commonly grown in northern Zimbabwe on the characteristics of the oscillations in Navel orange trees. This information was useful in deciding the optimal sampling frequency needed to obtain representative estimates of the plant water status. In addition, insights on the possible origin of the oscillations were also gained. The rootstocks comprised the rough lemon which is efficient in water uptake and produces drought tolerant trees and the troyer citrange which is less efficient in water uptake but it produces high quality fruit. Oscillations in sap flow, stem diameter and leaf water potential had sustained amplitudes and longer periods ({\textrangle}70 min) for orange trees budded on the troyer citrange rootstock, while trees on the rough lemon rootstock produced faster oscillations with diminishing amplitudes and short periods ranging from 35 to 55 min. A simple water balance model was used to describe the water relations of the trees budded on these two rootstocks. In this model, transpiration by the crown was used as the driving variable for stem sap flow, while the plant resistance (Rx) and capacitance (C) were parameter values obtained by model calibration. No significant differences in the estimates of Rx were found between the rootstocks, although this resistance appeared to change throughout the day. It is probable that the fluctuating resistance played a part in generating the stomatal oscillations through changes in the efficiency of water transport, which created transient internal water deficits in the leaves.},
  author       = {Dzikiti , S and Milford, JR and Steppe, Kathy and Lemeur, Raoul},
  booktitle    = {ACTA HORTICULTURAE},
  editor       = {Samietz, J},
  isbn         = {9789066056817},
  issn         = {0567-7572},
  language     = {eng},
  location     = {Einsiedeln, Switzerland},
  pages        = {259--264},
  publisher    = {International Society for Horticultural Science (ISHS)},
  title        = {Modelling the water transport dynamics in young navel orange trees budded on rootstocks commonly grown in northern Zimbabwe},
  url          = {http://www.actahort.org/books/803/803\_33.htm},
  volume       = {803},
  year         = {2008},
}

Chicago
Dzikiti , S, JR Milford, Kathy Steppe, and Raoul Lemeur. 2008. “Modelling the Water Transport Dynamics in Young Navel Orange Trees Budded on Rootstocks Commonly Grown in Northern Zimbabwe.” In Acta Horticulturae, ed. J Samietz, 803:259–264. Leuven, Belgium: International Society for Horticultural Science (ISHS).
APA
Dzikiti , S, Milford, J., Steppe, K., & Lemeur, R. (2008). Modelling the water transport dynamics in young navel orange trees budded on rootstocks commonly grown in northern Zimbabwe. In J. Samietz (Ed.), ACTA HORTICULTURAE (Vol. 803, pp. 259–264). Presented at the 8th International symposium on Modelling in Fruit Research and Orchard Management, Leuven, Belgium: International Society for Horticultural Science (ISHS).
Vancouver
1.
Dzikiti S, Milford J, Steppe K, Lemeur R. Modelling the water transport dynamics in young navel orange trees budded on rootstocks commonly grown in northern Zimbabwe. In: Samietz J, editor. ACTA HORTICULTURAE. Leuven, Belgium: International Society for Horticultural Science (ISHS); 2008. p. 259–64.
MLA
Dzikiti , S, JR Milford, Kathy Steppe, et al. “Modelling the Water Transport Dynamics in Young Navel Orange Trees Budded on Rootstocks Commonly Grown in Northern Zimbabwe.” Acta Horticulturae. Ed. J Samietz. Vol. 803. Leuven, Belgium: International Society for Horticultural Science (ISHS), 2008. 259–264. Print.