Advantages of diffuse light for horticultural production and perspectives for further research

Li, Tao; Yang, Qichang

doi:10.3389/fpls.2015.00704

Cited by 86 publications

(60 citation statements)

References 42 publications

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“…The total solar radiation on a horizontal area can be split up into direct irradiance and the diffuse irradiance, which is, besides the direct component, also important for the crops' growth. Even if accurate and flexible solar mapping models based on LiDAR data exist [26], it was highlighted that most light availability models composed for tree and forest environments don't account for the diffuse radiation [27]. The reviews of both light availability models and of solar mapping methods revealed that light models and solar maps are not realistic, and thus, not promising, if they are lacking information about diffuse radiation [24,28].…”

Section: Discussionmentioning

confidence: 99%

Modelling Shadow Using 3D Tree Models in High Spatial and Temporal Resolution

2017

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Information about the availability of solar irradiance for crops is of high importance for improving management practices of agricultural ecosystems such as agroforestry systems (AFS). Hence, the development of a high-resolution model that allows for the quantification of tree shading on a diurnal and annual time scale is highly demanded to generate realistic estimations of the shading dynamics in a given AFS. We describe an approach using 3D data derived from a terrestrial laser scanner and the steps undertaken to develop a vector-based model that quantifies and visualizes the shadow cast by single trees at daily, monthly, seasonal or annual levels with the input of cylinder-based tree models. It is able to compute the shadow of given tree models in time intervals of 10 min. To simulate seasonal growth and shedding of leaves, ellipsoids as replacement for leaves can be added to the tips of the tree model's branches. The shadow model is flexible in its input of location (latitude, longitude), tree architecture and temporal resolution. Due to the possibility to feed this model with factual climate data such as cloud covers, it represents the first 3D tree model that enables the user to retrospectively analyze the shadow regime below a given tree, and to quantify shadow-related developments in AFS.

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Section: Discussionmentioning

confidence: 99%

Modelling Shadow Using 3D Tree Models in High Spatial and Temporal Resolution

2017

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“…Hovi et al , Pettersen et al , Trouwborst et al ) and diffuse glass in the construction of greenhouses (e.g. Hemming et al , Li et al , Li and Yang ). Furthermore, monitoring the LUE of leaves may also be effective for detecting the changes in photosynthetic status and confirming that the controlled environment is operating appropriately.…”

Section: Introductionmentioning

confidence: 99%

Time course of the photochemical reflectance index during photosynthetic induction: its relationship with the photochemical yield of photosystem II

Murakami

Ibaraki

2018

Physiologia Plantarum

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Time courses of photochemical reflectance index (PRI) of an attached cucumber leaf during a dark-light transition were compared with those of photochemical yields of photosystem II (Y ) to discuss the feasibility of PRI imaging for estimating the efficiency of photosynthetic light use. Y and PRI were simultaneously evaluated with a pulse-amplitude modulation chlorophyll fluorometer and a low-cost imaging system consisting of digital cameras and band-pass filters, respectively. Y decreased immediately after the transition and then increased under various photon flux densities. Although PRI exhibited delayed time courses with respect to Y under low light conditions, PRI decreased monotonically under high light conditions. There was no correlation between Y and the changes in PRI (ΔPRI) immediately after the transition but Y was correlated with ΔPRI under the steady-state photosynthesis. These results indicate that the use of PRI to estimate Y under fluctuating light based on the regression obtained at steady state can overestimate Y . The imaging system was also applied to evaluate the spatial PRI distribution within a leaf. While PRI of leaf areas that remained untreated, or had been treated with H O again, first dropped and then rose under low light and monotonically decreased under high light conditions, leaf areas treated with inhibitor (dichlorophenyl dimethylurea) did not exhibit any changes. It is likely that the inhibitor suppressed lumen acidification, which triggers a decrease in PRI. It was suggested that Y of leaves with malfunctions in the photosynthetic electron transport can be overestimated by the PRI-based estimation.

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“…Saturation of the leaf photosynthetic apparatus occurs at high levels of solar radiation and results in a decrease in photosynthetic light use efficiency (Li and Yang, 2015). This process is referred to as photoinhibition and occurs when the rate of photodamage to PSII is greater than the rate of repair of photodamaged PSII (Murata et al, 2007).…”

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confidence: 99%

Protective Netting Improves Leaf-level Photosynthetic Light Use Efficiency in ‘Honeycrisp’ Apple Under Heat Stress

Mupambi

Musacchi

Serra

et al. 2018

horts

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Globally, apple production often occurs in semiarid climates characterized by high summer temperatures and solar radiation. Heat stress events occur regularly during the growing season in these regions. For example, in the semiarid eastern half of Washington State, historic weather data show that, on average, 33% of the days during the growing season exceed 30 °C. To mediate some of the effects of heat stress, protective netting (PN) can be used to reduce the occurrence of fruit sunburn. However, the impacts of reduced solar radiation in a high light environment on light-use efficiency and photosynthesis are poorly understood. We sought to understand the ecophysiological response of apple (Malus domestica Borkh. cv. Honeycrisp) under blue photoselective PN during days with low (26.6 °C), moderate (33.7 °C), or high (38.1 °C) ambient temperatures. Two treatments were evaluated; an uncovered control and blue photoselective PN. Maximum photochemical efficiency of PSII, or photosystem II (Fv/Fm) was significantly greater at all measurement times under blue photoselective PN compared with the control on days with high ambient temperatures. Fv/Fm dropped below 0.79, which is considered the threshold for stress, at 1000 hr in the control and at 1200 hr under blue photoselective PN on a day with high ambient temperature. On days with low or moderate ambient temperatures, Fv/Fm was significantly greater under blue photoselective PN at 1400 hr, which coincided with the peak in solar radiation. ‘Honeycrisp’ apple exhibited dynamic photoinhibition as shown by the diurnal decline in Fv/Fm. Quantum photosynthetic yield of PSII (ΦPSII) was also generally greater under blue photoselective PN compared with the control for days with moderate or high ambient temperatures. Photochemical reflectance index (ΔPRI), the difference in reflectance between a stress-responsive and nonstress-responsive wavelength, was greater under PN compared with the control on the day with high ambient temperatures, with no differences observed under low or moderate ambient temperatures. Leaf gas exchange did not show noticeable improvement under blue photoselective netting when compared with the control despite the improvement in leaf-level photosynthetic light use efficiency. In conclusion, PN reduced incoming solar radiation, improved leaf-level photosynthetic light use efficiency, and reduced the symptoms of photoinhibition in a high-light, arid environment.

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Advantages of diffuse light for horticultural production and perspectives for further research

Cited by 86 publications

References 42 publications

Modelling Shadow Using 3D Tree Models in High Spatial and Temporal Resolution

Modelling Shadow Using 3D Tree Models in High Spatial and Temporal Resolution

Time course of the photochemical reflectance index during photosynthetic induction: its relationship with the photochemical yield of photosystem II

Protective Netting Improves Leaf-level Photosynthetic Light Use Efficiency in ‘Honeycrisp’ Apple Under Heat Stress

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