Stomatal Oscillations in Orange Trees under Natural Climatic Conditions

Steppe, Kathy; Dzikiti, Sebinasi; Lemeur, Raoul; Milford, J. R.

doi:10.1093/aob/mcl031

Cited by 42 publications

(29 citation statements)

References 14 publications

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“…Burgess et al 1998;Howard et al 1996;Hultine et al 2004;Lott et al 1996;Meinzer et al 2004a;Nadezhdina and Cermak 2003;Oliveira et al 2005;Sakuratani et al 1999;Smith et al 1999) and branches (e.g. Alarcon et al 2003;Chapotin et al 2006;Fernandez et al 2006;Hubbard et al 2002;Martin et al 2001;Meinzer et al 2004b;Phillips et al 1999;Steinberg et al 1990;Steppe et al 2006;Yonemoto et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Using branch and basal trunk sap flow measurements to estimate whole-plant water capacitance: a caution

Burgess

Dawson

2007

Plant Soil

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Thermometric sap flow sensors are widely used to measure water flow in roots, stems and branches of plants. Comparison of the timing of flow in branches and stems has been used to estimate water capacitance of large trees. We review studies of sap flow in branches and present our own data to show that there is wide variation in the patterns and timing of sap flow of branches in different parts of the crown, owing to the course of daily solar illuminance. In contiguous forest, east-facing and upper branches are illuminated earlier than west-facing and lower branches and most capacitance studies do not include adequate information about branch sampling regimes relative to the overall pattern of crown illuminance, raising questions about the accuracy of capacitance estimates. Measuring only upper branches and normalising these results to represent the entire crown is dangerous because flows at the stem base likely peak in response to maximum crown illuminance (and transpiration) and this will differ compared to the timing of peak flows in upper branches. We suggest that the magnitude of flow lags between branches and stems needs further study, with careful attention to branch position and method application before a robust understanding of capacitance, particularly in woody tissues of large trees, can be formed. We did not detect flow lags in the world's tallest and largest tree species Sequoia sempervirens and Sequoiadendron giganteum, despite measurement along large pathlengths (∼57 and 85 m), which raises questions as to why large flow lags are often recorded for much smaller species. One conspicuous possibility is the different methods used among studies. Constantheating methods such as the thermal dissipation probe (and also heat balance methods) include heat capacitance behaviour due to warming of wood tissues, which delays the response of the sensors to changing sap flow conditions. We argue that methods with intrinsic heat-capacitance present dangers when trying to measure water-capacitance in trees. In this respect heat pulse methods hold an advantage.

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Section: Introductionmentioning

confidence: 99%

Using branch and basal trunk sap flow measurements to estimate whole-plant water capacitance: a caution

Burgess

Dawson

2007

Plant Soil

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“…The period of the g s oscillations that have been observed in some of our measurements (Fig. 1) is much shorter than the period of oscillations that are primarily controlled by plant water status (Barrs 1971, Steppe et al 2006. A pattern of measured g s was more scattered in plants exposed to low VPD, which indicates that stomatal response could be more synchronous under higher VPD, as suggested by Kaiser and Kappen (2001).…”

Section: Discussionmentioning

confidence: 48%

Short-term dynamics of stomatal response to sudden increase in CO<sub>2</sub> concentration in maize supplied with different amounts of water

Hladnik¹,

Eler²,

Kržan³

et al. 2009

Photosynt.

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Environmental factors that influence stomatal conductance (g s ) interact through a complex network of signal transduction and have therefore highly interdependent effect.In the present study we examined how plant water status affects stomatal sensitivity to the change of CO 2 concentration ([CO 2 ]). We investigated the short-term dynamic of stomatal response to a sudden [CO 2 ] increase (from 400 to 700 µmol(CO 2 ) mol -1 ) in maize supplied with different amounts of water (resulting ψ w = -0.35, -0.52 and -0.75 MPa). Gas exchange measurements were performed in short logging intervals and the response was monitored under two different levels of water vapour pressure deficit (VPD) of 1 and 2 kPa in order to observe the impact of air humidity. Generalized logistic curves were fitted to standardized stomatal response data, which enabled us to objectively estimate the level (relative decrease of g s ) and the dynamics of the response.Soil water stress and high VPD significantly decreased relative stomatal closure in response to [CO 2 ] rise, but simultaneously accelerated stomatal response to [CO 2 ], as revealed by shorter half life (t 1/2 ). VPD significantly affected the response of well-watered plants. In contrast, a fast stomatal reaction of water-deprived plants was predetermined by a low xylem water potential (ψ w ) of the leaf and the influence of air humidity was minor.

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“…On the other hand, the hydraulic connectivity between the soil water reservoir and the plant water pathway relies on a negative water potential gradient created by leaves water transpiration. For comprehensively investigating the plant-water relation, various sensing techniques have been developed, such as those for leaf stomatal conductance (Friend et al, 1989;Steppe et al, 2006;Blonquist et al, 2009), leaf water potential (Turner and Long, 1980;Zimmermann et al, 2008), leaf temperature (Hashimoto et al, 1984;Rahkonen and Jokela, 2003;Gontia and Tiwari, 2008), leaf thickness (Li et al, 2009;Seelig et al, 2012), stem water potential (Choné et al, 2001;Yang et al, 2012), stem diameter variation (Fernández and Cuevas, 2010), stem sap flow rate (Č ermák et al, 1973;Bakfr and Van Bavel, 1987;Smith and Allen, 1996;Trcala and Č ermák, 2012), stem water content (Wullschleger et al, 1990;Irvine and Grace, 1997) and root water potential/pressure (Fiscus, 1972;De Swaef et al, 2013). However, even though these sensors provide different physiological information to support insights into plant water status, none provides a single measure that is well correlated with the numerous factors influencing plant water stress (Kramer, 1988).…”

Section: Introductionmentioning

confidence: 99%

“…The water flow upward through plant is related to both the long-distance transport in xylem conduits and local dynamic exchange of the water between the xylem conduits and the storage tissues (Steppe et al, 2006;Sevanto et al, 2011). Many studies for trees observed a time lag between leaf transpiration response and stem sap flow response, varying from minutes to hours once solar radiation induces transpiration activity (Schulze et al, 1985;Goldstein et al, 1998;Steppe et al, 2002;Scholz et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

In situ observation of thermal and hydraulic responses of sunflower stem to cold water irrigation using embedded thermocouples

Zhou

Ying

Cheng

et al. 2014

Computers and Electronics in Agriculture

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Stomatal Oscillations in Orange Trees under Natural Climatic Conditions

Abstract: The results show marked stomatal oscillations persisting under natural climatic conditions and underscore the need to discover why this phenomenon is so pronounced in orange trees.

Cited by 42 publications

References 14 publications

Using branch and basal trunk sap flow measurements to estimate whole-plant water capacitance: a caution

Using branch and basal trunk sap flow measurements to estimate whole-plant water capacitance: a caution

Short-term dynamics of stomatal response to sudden increase in CO<sub>2</sub> concentration in maize supplied with different amounts of water

In situ observation of thermal and hydraulic responses of sunflower stem to cold water irrigation using embedded thermocouples

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