Computer‐based analysis of steady‐state and transient heat transfer of small‐sized leaves by free and mixed convection

Roth‐Nebelsick, Anita

doi:10.1046/j.1365-3040.2001.00712.x

Cited by 56 publications

(40 citation statements)

References 26 publications

(42 reference statements)

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“…Since the mixed convection cannot be expressed by a simple equation (Roth-Nebelsick 2001), we used the equation for one of the four boundary layer modes in which the Nu was greatest. Since the mixed convection cannot be expressed by a simple equation (Roth-Nebelsick 2001), we used the equation for one of the four boundary layer modes in which the Nu was greatest.…”

Section: Resultsmentioning

confidence: 99%

Optimum leaf size predicted by a novel leaf energy balance model incorporating dependencies of photosynthesis on light and temperature

Okajima

Taneda

Noguchi

et al. 2011

Ecological Research

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To clarify relationships between leaf size and the environment variables, we constructed an energy balance model for a single leaf incorporating Leuning's stomatal conductance model and Farquhar's leaf photosynthesis model. We ran this model for various environmental conditions paying particular attention to the leaf boundary layer. The leaf size maximizing the rate of photosynthesis per unit leaf area (A) at a high irradiance differed depending on the air temperature. In warm environments, A increased with decrease in leaf size, whereas in cool environments, there was the leaf size maximizing A. With the increase in leaf size, the CO2 concentration inside the leaf (Ci) decreased and the leaf temperature increased, both due to lower boundary layer conductance. At low air temperatures, the negative effect of low Ci on A in large leaves was compensated by the increase in leaf temperature towards the optimum temperature for A. This balance determined the optimum leaf size for A at low air temperatures. With respect to water use efficiency, large leaves tended to be advantageous, especially in cool environments at low‐to‐medium irradiances. Some temperature‐dependent trends in leaf size observed in nature are discussed based on the present results.

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Section: Resultsmentioning

confidence: 99%

Optimum leaf size predicted by a novel leaf energy balance model incorporating dependencies of photosynthesis on light and temperature

Okajima

Taneda

Noguchi

et al. 2011

Ecological Research

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“…The rate of heat transfer from lobed metal plates or lobed leaves coated in metal is greater than from shallow-lobed or unlobed ones (Parkhurst et al 1968;Thom 1968;Vogel 1970;Gottschlich and Smith 1982;Gurevitch and Schuepp 1990b;Roth-Nebelsick 2001). Artificial or coated leaves have been used because they enable boundary layer resistance to be investigated in the absence of transpiration.…”

Section: Temperature and Watermentioning

confidence: 99%

The evolution and functional significance of leaf shape in the angiosperms

Nicotra

Leigh

Boyce

et al. 2011

Functional Plant Biol.

442

396

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Abstract. Angiosperm leaves manifest a remarkable diversity of shapes that range from developmental sequences within a shoot and within crown response to microenvironment to variation among species within and between communities and among orders or families. It is generally assumed that because photosynthetic leaves are critical to plant growth and survival, variation in their shape reflects natural selection operating on function. Several non-mutually exclusive theories have been proposed to explain leaf shape diversity. These include: thermoregulation of leaves especially in arid and hot environments, hydraulic constraints, patterns of leaf expansion in deciduous species, biomechanical constraints, adaptations to avoid herbivory, adaptations to optimise light interception and even that leaf shape variation is a response to selection on flower form. However, the relative importance, or likelihood, of each of these factors is unclear. Here we review the evolutionary context of leaf shape diversification, discuss the proximal mechanisms that generate the diversity in extant systems, and consider the evidence for each the above hypotheses in the context of the functional significance of leaf shape. The synthesis of these broad ranging areas helps to identify points of conceptual convergence for ongoing discussion and integrated directions for future research.

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“…• C under favorable conditions [29]. Particularly, leaf temperature is an indicator of stomatal conductance because stomatal opening increases with decreasing temperature due to evaporation.…”

Section: Thermal Imagingmentioning

confidence: 99%

Early Detection of Powdery Mildew Disease in Wheat (Triticum aestivum L.) Using Thermal Imaging Technique

Awad

Abdullah

Bayoumi

et al. 2015

Advances in Intelligent Systems and Computing

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Abstract. Powdery mildew caused by Erysiphe graminis f. sp. tritici is one of the most harmful disease causing great losses in wheat yield. Currently, thermal spectral sensing of plant disease under different environmental conditions in field is a cutting-edge research. Objectives of this study were to assess thermal imaging of normal and infected leaves for early detection of powdery mildew in wheat after the artificial infection with Erysiphe graminis fungus in a pot experiment under greenhouse conditions. Pot experiment lasting for 30 days was conducted. Additionally, wheat seedlings were artificially infected with pathogen at 10 days from sowing. This is the first study in Egypt to use thermal imaging technique for early detection of powdery mildew disease on leaf using thermal signatures of artificial infected leaves as a reference images. Particularly, the variations in temperature between infected and healthy leaves of wheat and the variation between air and leaf-surface temperatures under greenhouse conditions were sensed for early detection of disease. Results revealed that infection with powdery mildew pathogen induced changes in leaf temperature (from 0.37• C after one hour from the infection to 0.78• C at 21 days after infection with the pathogen) and metabolism, contributing to a distinct thermal signature characterizing the early and late phases of the infection.

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Computer‐based analysis of steady‐state and transient heat transfer of small‐sized leaves by free and mixed convection

Cited by 56 publications

References 26 publications

Optimum leaf size predicted by a novel leaf energy balance model incorporating dependencies of photosynthesis on light and temperature

Optimum leaf size predicted by a novel leaf energy balance model incorporating dependencies of photosynthesis on light and temperature

The evolution and functional significance of leaf shape in the angiosperms

Early Detection of Powdery Mildew Disease in Wheat (Triticum aestivum L.) Using Thermal Imaging Technique

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