Modelling leaf phototropism in a cucumber canopy

Kahlen, Katrin; Wiechers, Dirk; Stützel, Hartmut

doi:10.1071/fp08034

Cited by 40 publications

(29 citation statements)

References 29 publications

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“…The addition of a three-dimensional structure to the expansion model implies to model organs' shape and spatial position, as done for FSPMs of other species (e.g., Evers et al, 2005; Mündermann et al, 2005; Kahlen et al, 2008). This 3D model would provide essential information to study the environmental regulation of bud break, which strongly influences plant architecture and still remains a major research area (Domagalska and Leyser, 2011).…”

Section: Discussionmentioning

confidence: 99%

Rose bush leaf and internode expansion dynamics: analysis and development of a model capturing interplant variability

et al. 2013

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Rose bush architecture, among other factors, such as plant health, determines plant visual quality. The commercial product is the individual plant and interplant variability may be high within a crop. Thus, both mean plant architecture and interplant variability should be studied. Expansion is an important feature of architecture, but it has been little studied at the level of individual organs in rose bushes. We investigated the expansion kinetics of primary shoot organs, to develop a model reproducing the organ expansion of real crops from non-destructive input variables. We took interplant variability in expansion kinetics and the model's ability to simulate this variability into account. Changes in leaflet and internode dimensions over thermal time were recorded for primary shoot expansion, on 83 plants from three crops grown in different climatic conditions and densities. An empirical model was developed, to reproduce organ expansion kinetics for individual plants of a real crop of rose bush primary shoots. Leaflet or internode length was simulated as a logistic function of thermal time. The model was evaluated by cross-validation. We found that differences in leaflet or internode expansion kinetics between phytomer positions and between plants at a given phytomer position were due mostly to large differences in time of organ expansion and expansion rate, rather than differences in expansion duration. Thus, in the model, the parameters linked to expansion duration were predicted by values common to all plants, whereas variability in final size and organ expansion time was captured by input data. The model accurately simulated leaflet and internode expansion for individual plants (RMSEP = 7.3 and 10.2% of final length, respectively). Thus, this study defines the measurements required to simulate expansion and provides the first model simulating organ expansion in rosebush to capture interplant variability.

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Section: Discussionmentioning

confidence: 99%

Rose bush leaf and internode expansion dynamics: analysis and development of a model capturing interplant variability

et al. 2013

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“…The electron transport rate, J ( μ mol m −2 s −1 ), is the product of incident PPFD, leaf absorptance ( α , 87% for cucumber, Kahlen et al . ), the partitioning factor of light between the two photosystems ( β , 0.5 for cucumber, Juszczuk et al . ), and photochemical efficiency of photosystem II (ΦPSII), calculated by steady‐state fluorescence ( F s ) and maximum fluorescence ( F m ′) following a saturating light pulse (>7000 μ mol m −2 s −1 for 0.8 s; Φ PSII = ( F m ′ − F s )/ F m ′).…”

Section: Methodsmentioning

confidence: 99%

Disentangling the contributions of osmotic and ionic effects of salinity on stomatal, mesophyll, biochemical and light limitations to photosynthesis

Chen

Kahlen

Stützel

2015

Plant Cell & Environment

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There are conflicting opinions on the relative importance of photosynthetic limitations under salinity. Quantitative limitation analysis of photosynthesis provides insight into the contributions of different photosynthetic limitations, but it has only been applied under saturating light conditions. Using experimental data and modelling approaches, we examined the influence of light intensity on photosynthetic limitations and quantified the osmotic and ionic effects of salinity on stomatal (LS ), mesophyll (LM ), biochemical (LB ) and light (LL ) limitations in cucumber (Cucumis sativus L.) under different light intensities. Non-linear dependencies of LS , LM and LL to light intensity were found. Osmotic effects on LS and LM increased with the salt concentration in the nutrient solution (Ss ) and the magnitude of LM depended on light intensity. LS increased with the Na(+) concentration in the leaf water (Sl ) and its magnitude depended on Ss . Biochemical capacity declined linearly with Sl but, surprisingly, the relationship between LB and Sl was influenced by Ss . Our results suggest that (1) improvement of stomatal regulation under ionic stress would be the most effective way to alleviate salinity stress in cucumber and (2) osmotic stress may alleviate the ionic effects on LB but aggravate the ionic effects on LS .

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“…This finding suggests that the effort for identifying more realistic leaf shapes is beneficial for simulation studies. Significant differences in other growth parameters between simulations with original and new prototype leaves shows the sensitivity of the functional-structural plant model on environmental effects and calls for studies considering further model extensions, e.g., on leaf movement (phototropism) [15]. …”

Section: Effects Of Leaf Shape On Virtual Plant Simulationsmentioning

confidence: 99%

“…Cucumber is one of those model crops and recently became the first genome-sequenced vegetable [14], as it is not only of interest for plant physiologist, but also implies economical interests for the food industry. Hence, the FSPM for the greenhouse cucumber Cucumis sativus L. is under steady development [5,6,15,16].…”

Section: Introductionmentioning

confidence: 99%

Towards More Realistic Leaf Shapes in Functional-Structural Plant Models

Schmidt

Kahlen

2018

Symmetry

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Fluctuating asymmetry in plant leaves is a widely used measure in geometric morphometrics for assessing random deviations from perfect symmetry. In this study, we considered the concept of fluctuating asymmetry to improve the prototype leaf shape of the functional-structural plant model L-Cucumber. The overall objective was to provide a realistic geometric representation of the leaves for the light sensitive plant reactions in the virtual plant model. Based on three-dimensional data from several hundred in situ digitized cucumber leaves comparisons of model leaves and measurements were conducted. Robust Bayesian comparison of groups was used to assess statistical differences between leaf halves while respecting fluctuating asymmetries. Results indicated almost no directional asymmetry in leaves comparing different distances from the prototype while detecting systematic deviations shared by both halves. This information was successfully included in an improved leaf prototype and implemented in the virtual plant model L-Cucumber. Comparative virtual plant simulations revealed a slight improvement in plant internode development against experimental data using the novel leaf shape. Further studies can now focus on analyses of stress on the 3D-deformation of the leaf and the development of a dynamic leaf shape model.

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Modelling leaf phototropism in a cucumber canopy

Cited by 40 publications

References 29 publications

Rose bush leaf and internode expansion dynamics: analysis and development of a model capturing interplant variability

Rose bush leaf and internode expansion dynamics: analysis and development of a model capturing interplant variability

Disentangling the contributions of osmotic and ionic effects of salinity on stomatal, mesophyll, biochemical and light limitations to photosynthesis

Towards More Realistic Leaf Shapes in Functional-Structural Plant Models

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