A Biophysical Analysis of Stem and Root Diameter Variations in Woody Plants

Génard, Michel; Fishman, Svetlana; Vercambre, Gilles; Huguet, J.G.; Bussi, Claude; Besset, Jacques; Habib, Robert H.

doi:10.1104/pp.126.1.188

Cited by 150 publications

(125 citation statements)

References 42 publications

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“…The higher variability of MDTS could be explained by different water conductivities in the xylem tissue that are independent of the plant water status (Naor and Cohen, 2003). Xylem water potential is the main driving force of trunk diameter changes (Klepper et al, 1971) but its amplitude is modulated by several factors including the elastic and water diffusion properties of the phloem tissue (Parlange et al, 1975;Génard et al, 2001), bark-xylem osmotic pressure gradients (Cochard et al, 2001), and different organs growth rates (McBurney and Costigan, 1984). In addition, the fact that dendrometers measure the radius in a small region in the trunk and that SWP is representative of a whole branch, may also explain why SWP is less variable than MDTS (Fereres and Goldhamer, 2003).…”

Section: Resultsmentioning

confidence: 99%

Sensitivity and Variability of Two Plant Water Stress Indicators: Exploring Criteria for Choosing a plant Monitoring Method for Avocado Irrigation Management

Celedon¹,

Gil

Ferreyra

et al. 2012

Chilean J. Agric. Res.

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Avocado (Persea americana Mill.) is a fruit-tree species highly susceptible to water deficit, which makes irrigation management a difficult task for growers. When irrigation is inadequate, trees suffer growth reduction, fruit losses, and roots damage. This study addressed the question of how to assess water stress in avocado trees and the considerations to choose an indicator to measure the plant water stress. In this work the sensitivity and variability of two water stress indicators in response to water deficit were analyzed: stem water potential (SWP) and maximum daily trunk shrinkage (MDTS). During a period of high water demand, avocado trees planted in a clay loam soil were subjected to water stress by withholding irrigation and compared to control trees irrigated according to the maximal crop evapotranspiration. During the study, avocado trees reached a minimum SWP of -0.9 MPa and a maximum MDTS of ~ 285 µm. To better understand avocado tree response to water deficit, leaf abscisic acid, stomatal conductance, soil moisture, and vapor pressure deficit were also measured. Interestingly, it was found that water stress indicators showed differences with control after 3 d of withholding irrigation. It was possible to observe that MDTS was more sensitive in detecting water stress than SWP, signal strength of 4.5 vs. 1.2 respectively; however, MDTS higher variability counteracted its performance as stress indicator, coefficient of variation of 32% vs. 9%, respectively. This study confirms that monitoring water stress is an important tool for avocado irrigation management and should consider both, the sensitivity and variability of the indicator.

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Section: Resultsmentioning

confidence: 99%

Sensitivity and Variability of Two Plant Water Stress Indicators: Exploring Criteria for Choosing a plant Monitoring Method for Avocado Irrigation Management

Celedon¹,

Gil

Ferreyra

et al. 2012

Chilean J. Agric. Res.

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“…Calibration showed a decrease in ε 0 , the proportionality constant between the elastic modulus ε and the product of stem diameter and pressure potential (Génard et al, 2001) across the growing season (results not shown). This contrasts with the decrease in elasticity when tissues age.…”

Section: Evolution Of Model Parametersmentioning

confidence: 99%

Effect of Stem Age on the Response of Stem Diameter Variations to Plant Water Status in Tomato

Hanssens¹,

Swaef²,

Steppe³

et al. 2012

Acta Hortic.

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Plant water status plays a major role in glasshouse cultivation of tomato (Solanum lycopersicum L.). New climate control technologies alter the glasshouse climate and make it less dependent on solar radiation. However, irrigation strategies are still often based on solar radiation sums. In order to maintain a good plant water status, it is interesting to use plant-based methods such as monitoring sap flow (F) or stem diameter variations (SDV). Though SDV give important information about plant water status, an unambiguous interpretation might be difficult because other factors such as stem age, fruit load and sugar content of the stem also affect SDV. In this study, an analysis of the effect of stem age on the response of SDV to water status was performed by calibration of a mechanistic flow and storage model. This allowed us to determine how parameter values changed across the growing season. Tissue extensibility decreased over the growing season resulting in a lower growth rate potential, whereas daily cycles of shrinking and swelling of the stem became more pronounced towards the end of the growing season. Parameters were then adapted to time-dependent variables and implemented in the model, allowing long term simulation and interpretation of SDV. Sensitivity analysis showed that model predictions were very sensitive to initial sucrose content of the phloem tissue and the parameters related to plastic growth. INTRODUCTIONA good plant water status is essential for good production and fruit quality in glasshouse cultivation of tomato (Solanum lycopersicum L.). Current irrigation strategies are often based on solar radiation sums. During the last years, lots of efforts have been made in order to make greenhouse cultivation more energy-efficient. Due to the

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“…Diurnal patterns of shrinkage and a portion of the subsequent expansion in the stems of trees are caused by variations in tree water relations (Fritts 1976;Kozlowski and Winget 1964). However, much of the daily stem expansion, which can be considered true growth, is a result of cell division and expansion in the cambial zone and the zone of differentiating xylem (Downes et al 2000;Steppe et al 2005).…”

Section: Introductionmentioning

confidence: 98%

Differences in daily stem size variation and growth in two hybrid eucalypt clones

Drew

Downes

Grzeskowiak³

et al. 2008

Trees

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Understanding daily stem size variation is important as the net increment of a forest stand is ultimately determined by the accumulation of daily increment events. In this study, measurements of stem size at high spatial and temporal resolution were made using two commercial hybrid Eucalyptus clones [E. grandis 9 urophylla (GU) and E. grandis 9 camaldulensis (GC)] over a period of more than 3.5 years in order to better understand how daily stem growth is effected by variations in environmental conditions. It was evident that GU had fewer days on which net growth occurred than GC. However, when growth did occur, GU grew for longer each day and at a higher rate than GC. Thus, it still had an overall larger net stem increment during the study period. The GU clone had a markedly intermittent pattern of growth, such that growth essentially ceased under drought conditions, but responded rapidly when water became available. This confirms other findings that E. grandis 9 urophylla is more susceptible to drought stress than E. grandis 9 camaldulensis, but emphasizes that a strategy of ''rapid response'' when environmental conditions become temporarily non-limiting is a good one in terms of net increment at sites such as in this study.

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A Biophysical Analysis of Stem and Root Diameter Variations in Woody Plants

Cited by 150 publications

References 42 publications

Sensitivity and Variability of Two Plant Water Stress Indicators: Exploring Criteria for Choosing a plant Monitoring Method for Avocado Irrigation Management

Sensitivity and Variability of Two Plant Water Stress Indicators: Exploring Criteria for Choosing a plant Monitoring Method for Avocado Irrigation Management

Effect of Stem Age on the Response of Stem Diameter Variations to Plant Water Status in Tomato

Differences in daily stem size variation and growth in two hybrid eucalypt clones

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