Midday Depression vs. Midday Peak in Diurnal Light Interception: Contrasting Patterns at Crown and Leaf Scales in a Tropical Evergreen Tree

Ventre-Lespiaucq, Agustina B.; Flanagan, Nicola S.; Ospina-Calderón, Nhora Helena; Delgado, Juan A.; Escudero, Adrián

doi:10.3389/fpls.2018.00727

Cited by 7 publications

(6 citation statements)

References 62 publications

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“…The occurrence of "midday depression" was considered a stress effect or an adaptation strategy of apple to drought. This adaptation strategy is also observed in guava tree [30]. In addition, the degree of this response differed markedly between stressed cultivars, with Pn, Gs, Ci and Tr for Yanfu 3 remaining significantly lower than the controls.…”

Section: Discussionsupporting

confidence: 57%

Contrasting Drought Tolerance in Two Apple Cultivars Associated with Difference in Leaf Morphology and Anatomy

Bai¹,

Li²,

Song³

et al. 2019

AJPS

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Apple is one of the most important fruit trees in temperate zones, and is cultivated widely throughout the world. Drought stress affects the normal growth of apple tree, and further affects fruit yield and quality. The present study examined the effects of drought on photosynthesis and water use efficiency (WUE) of two apple cultivars (Honeycrisp and Yanfu 3) that differ in drought tolerance. The results showed that the photosynthetic rate decreased in response to drought stress for both cultivars, with significant differences in intensity. Values for net photosynthetic rate (Pn) in stressed Yanfu 3 remained significantly lower than in the controls, while, for Honeycrisp, only a slight drop in photosynthesis. Similarly, stomatal conductance (Gs), intercellular CO 2 concentration (Ci), transpiration rate (Tr) were markedly reduced in Yanfu 3 under drought stress. However, Honeycrisp showed only minor changes. Under drought stress, the contents of Chl a, Chl b and Chl t in Yanfu 3 were all decreased significantly compared with the control. However, little difference in Honeycrisp was noted between stressed plants and controls. Values for WUE in stressed Yanfu 3 remained higher than in the controls from day 3 until the end of the experiment, while no significant difference was observed in Honeycrisp. Furthermore, Honeycrisp also exhibited superior physiological traits, as indicated by its anatomical and morphological characteristics. Therefore, we conclude that the superior drought tolerance of Honeycrisp was due to its anatomical and morphological characteristics, which possibly contributed to the maintenance of higher photosynthetic capacity than Yanfu 3.

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Section: Discussionsupporting

confidence: 57%

Contrasting Drought Tolerance in Two Apple Cultivars Associated with Difference in Leaf Morphology and Anatomy

Bai¹,

Li²,

Song³

et al. 2019

AJPS

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“…Total incoming light at the top of the canopy in tropical forests can exceed 2000 µmol m −2 s −1 (Shuttleworth, 1984), and we therefore expected that the light saturation point of the upper canopy sunlit leaves would be reached at PPFD levels close to 2000 µmol m −2 s −1 for optimal light use efficiency. However, the upper canopy sunlit leaves typically received much less incoming PPFD due to the diel cycle of the solar zenith angle and the leaf angle (Ventre‐Lespiaucq, Flanagan, Ospina‐Calderon, Delgado, & Escudero, 2018). This is demonstrated by the comparison of light interception by sensors installed on the leaves themselves compared to measurements of incoming light on the flux tower (Figures S3), indicating that the leaves are not frequently exposed to very high PPFD levels.…”

Section: Discussionmentioning

confidence: 99%

Can light‐saturated photosynthesis in lowland tropical forests be estimated by one light level?

et al. 2020

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Leaf-level net photosynthesis (A n) estimates and associated photosynthetic parameters are crucial for accurately parameterizing photosynthesis models. For tropical forests, such data are poorly available and collected at variable light conditions. To avoid over-or underestimation of modeled photosynthesis, it is critical to know at which photosynthetic photon flux density (PPFD) photosynthesis becomes light-saturated. We studied the dependence of A n on PPFD in two tropical forests in French Guiana. We estimated the light saturation range, including the lowest PPFD level at which A sat (A n at light saturation) is reached, as well as the PPFD range at which A sat remained unaltered. The light saturation range was derived from photosynthetic light-response curves, and within-canopy and interspecific differences were studied. We observed wide light saturation ranges of A n. Light saturation ranges differed among canopy heights, but a PPFD level of 1,000 µmol m −2 s −1 was common across all heights, except for pioneer trees species that did not reach light saturation below 2,000 µmol m −2 s −1. A light intensity of 1,000 µmol m −2 s −1 sufficed for measuring A sat of climax species at our study sites, independent of the species or the canopy height. Because of the wide light saturation ranges, results from studies measuring A sat at higher PPFD levels (for upper canopy leaves up to 1,600 µmol m −2 s −1) are comparable with studies measuring at 1,000 µmol m −2 s −1. | 1185 VERRYCKT ET al.

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“…Virtual plants would be a novel approach for quantitatively analyzing the light interception of the canopy, thereby aiding in the design of tree architecture. Based on our previous studies (Tang et al, 2011, 2017, 2018), the software LSTree has been extended for tree-type design to examine the light interception of a canopy by integrating a radiosity model and modified rectangular hyperbola model. The interactive design module was implemented using the pseudo color offscreen rendering method; this method can obtain objects in large graphics quickly, which contributes to the interactive editing of 3D tree models.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, light interception is considered a major performance metric for defining ideotypes (Silva et al, 2014b; Gao et al, 2018; Rpa et al, 2018). An optimal canopy architecture is generally evaluated using parameters such as leaf shape (Rpa et al, 2018), leaf angle, leaf direction (Jung et al, 2018; Ventrelespiaucq et al, 2018), internode length (Silva et al, 2014b) and so on. Scaffold branch angle is one of the most widely used parameters in fruit training systems, because the adjustment of the angle of the branches will change the direction of the leaf correspondingly.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Plant Canopy Based on Light Interception: A Case Study With Loquat

et al. 2019

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Canopy architecture determines the light distribution and light interception in the canopy. Reasonable shaping and pruning can optimize tree structure; maximize the utilization of land, space and light energy; and lay the foundation for achieving early fruiting, high yield, health and longevity. Due to the complexity of loquat canopy architecture and the multi-year period of tree growth, the variables needed for experiments in canopy type training are hardly accessible through field measurements. In this paper, we concentrated on exploring the relationship between branching angle and light interception using a three-dimensional (3D) canopy model in loquat ( Eriobotrya japonica Lindl ). First, detailed 3D models of loquat trees were built by integrating branch and organ models. Second, the morphological models of different loquat trees were constructed by interactive editing. Third, the 3D individual-tree modeling software LSTree integrated with the OpenGL shadow technique, a radiosity model and a modified rectangular hyperbola model was used to calculate the silhouette to total area ratio, the distribution of photosynthetically active radiation within canopies and the net photosynthetic rate, respectively. Finally, the influence of loquat tree organ organization on the light interception of the trees was analyzed with different parameters. If the single branch angle between the level 2 scaffold branch and trunk is approximately 15° and the angles among the level 2 scaffold branches range from 60 to 90°, then a better light distribution can be obtained. The results showed that the branching angle has a significant impact on light interception, which is useful for grower manipulation of trees, e.g., shoot bending (scaffold branch angle). Based on this conclusion, a reasonable tree structure was selected for intercepting light. This quantitative simulation and analytical method provides a new digital and visual method that can aid in the design of tree architecture.

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Midday Depression vs. Midday Peak in Diurnal Light Interception: Contrasting Patterns at Crown and Leaf Scales in a Tropical Evergreen Tree

Cited by 7 publications

References 62 publications

Contrasting Drought Tolerance in Two Apple Cultivars Associated with Difference in Leaf Morphology and Anatomy

Contrasting Drought Tolerance in Two Apple Cultivars Associated with Difference in Leaf Morphology and Anatomy

Can light‐saturated photosynthesis in lowland tropical forests be estimated by one light level?

Optimal Design of Plant Canopy Based on Light Interception: A Case Study With Loquat

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