Concomitant dendrometer and leaf patch pressure probe measurements reveal the effect of microclimate and soil moisture on diurnal stem water and leaf turgor variations in young oak trees

Ehrenberger, W.; Rüger, S.; Fitzke, Ronald; Vollenweider, Pierre; Günthardt‐Goerg, Madeleine S.; Kuster, Thomas; Zimmermann, U.; Arend, Matthias

doi:10.1071/fp11206

Cited by 64 publications

(66 citation statements)

References 34 publications

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“…As observed in other studies (Zimmermann et al, 2008Ehrenberger et al, 2012), there are some indications to be used for the evaluation of drought using probes such as the following: enhancing Pp peaks at noon (when this increase becomes maximum, it is also called Pp peak or Pp max), increasing Pp night values (increase of minimum values), and Pp recovery between maximum and minimum values. Height growth (cm) in maize plants during 30 days of treatment, representing the whole cycle of analysis.…”

Section: Discussionmentioning

confidence: 99%

“…The magnitude of the leaf pressure transfer function and thus the attenuation of the constant external pressure, is dictated by a plant-specific, turgor pressure-independent term and a turgor pressure-dependent term (Westhoff et al, 2009). The behavior of many plants, like banana , olives (Fernandez et al, 2011;Ben-Gal et al, 2010), wheat (Bramley et al, 2013), grapevines , canola (Kant et al, 2014) and oak (Ehrenberger et al, 2012) were tested and concluded that this technique have highly precision to measure water status in intact plants. However, there is no observation for maize yet.…”

Section: Introductionmentioning

confidence: 99%

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Leaf turgor pressure in maize plants under water stress

Riboldi¹,

Oliveira²,

Angelocci³

2016

Aust J Crop Sci

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Maize grown is affected by water stress reducing photosynthetic rate and availability of water in its tissues, decreasing plant yield. Monitoring plant water potential is an important indicator of the degree of water stress. With the new magnetic probe for determining leaf turgidity, it is possible to evaluate the water status of the plant and, in some cases, to indicate the optimal relative tolerance to water stress. The union of new and old approaches gives us a better knowledge of water relations in plats. Therefore, the aim of this study was to understand the behavior of maize plants subjected to water stress, using novel and conventional approaches. Maize plants were grown in pots in a greenhouse for 45 days. After this period, plants were subjected to water stress, where turgor measurements expressed by the variable Pp (patch pressure) were monitored. In addition, the leaf water potential, stomatal conductance, CO 2 assimilation, transpiration rate, and variable growth (height, leaf area and dry weight) had been monitored for 30 days. Two treatments were conducted, one in which the plant was irrigated and the other one in which irrigation was fully suspended for a period of time and monitored the water status. As the days passed, the plants showed the first visual signs of stress like leaf rolling. During this period, we observed fluctuating Pp values throughout the day, but with a recovery of turgor at night. There were significant differences between treatments for stomatal conductance, water potential, photosynthesis, and Pp, mainly before irrigation. After each irrigation, there has been a rapid recovery in all parameters. There was five periods of stress and it is possible to see a pattern of decreasing and increasing the Pp as the advance of stress, mainly in the last two. Maize plants had a big resilience in water stress conditions, due to mechanisms of water loss mitigation, like leaf rolling and possibly osmotic adjustment. Thus, it was concluded that Pp introduced a new approach to study plants subjected to water stress and it is a complement to other variables as CO 2 assimilation rate, stomatal conductance, transpiration rate, and leaf water potential.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Leaf turgor pressure in maize plants under water stress

Riboldi¹,

Oliveira²,

Angelocci³

2016

Aust J Crop Sci

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“…Very little is known about the impact of this bark degradation on SR and about its timing; it may mainly take place during the dormancy period. This aspect is thus not further addressed in this study. Any water‐related processes affecting the SR are driven by water potential gradients in the tree, which are mainly induced by transpiration and altered by water availability in the soil, by temperature‐dependent hydraulic flow limitations (Zweifel et al ., ; Ehrenberger et al ., ; Steppe et al ., ; Dawes et al ., ), and by osmotic processes in the bark (De Schepper & Steppe, ; Sevanto et al ., ; Mencuccini et al ., ; Chan et al ., ). The transpiration‐induced tension in the xylem (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…The partitioning procedure can be carried out retrospectively only, because it needs information about all SR peaks in a time‐series. One parameter needs to be set to define the maximum temporal range between two neighbouring SR peaks (Zweifel et al ., ), affecting the slope of the growth. The ZG concept results in a GRO curve with a stepwise shape (Deslauriers et al ., ,b, ; Drew & Downes, ; Ehrenberger et al ., ) with the assumption of no growth during periods of stem shrinkage (i.e. increased TWD).…”

Section: Introductionmentioning

confidence: 99%

Are trees able to grow in periods of stem shrinkage?

et al. 2016

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SummarySeparating continuously measured stem radius (SR) fluctuations into growth-induced irreversible stem expansion (GRO) and tree water deficit-induced reversible stem shrinkage (TWD) requires a conceptualization of potential growth processes that may occur during periods of shrinking and expanding SR below a precedent maximum. Here, we investigated two physiological concepts: the linear growth (LG) concept, assuming linear growth, versus the zero growth (ZG) concept, assuming no growth during periods of stem shrinkage.We evaluated the physiological mechanisms underlying these two concepts and assessed their respective plausibilities using SR data obtained from 15 deciduous and evergreen trees.The application of the LG concept produced steady growth rates, whereas growth rates varied strongly under the ZG concept, more in accordance with mechanistic expectations. Further, growth increased for a maximum of 120 min after periods of stem shrinkage, indicating limited growth activity during those periods. However, this extra growth was found to be a small fraction of total growth only. Furthermore, TWD under the ZG concept was better explained by a hydraulic plant model than TWD under the LG concept.We conclude that periods of stem shrinkage allow for very little growth in the four tree species investigated. However, further studies should focus on obtaining independent growth data to ultimately validate these findings.

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“…Bark time series were detrended for growth in order to use it as a direct measure of water deficit in trees. For this, the growth line of the species was determined, based on the local maximum values of stem radius (Zweifel et al, 2005;Ehrenberger et al, 2012). The actual water deficit was calculated by subtracting the measured changes in stem radius from the growth line.…”

Section: Methodsmentioning

confidence: 99%