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The Leibniz-Institute of Vegetable and Ornamental Crops IGZ aims for excellence in horticultural research and related plant, environmental, nutritional and social sciences. IGZ conducts strategic and international research for the sustainable production and use of vegetables, contributing to […]. IGZ conducts strategic and international research for the sustainable production and use of vegetables, contributing to food security, human well-being and the conservation of natural resources. At IGZ, researchers from different disciplines work together on core-funded and grant-funded projects, in collaboration with national and international research partners. Postdoctoral researcher in temperature perception networks in plants f,m,d.
WATCH RELATED VIDEO: LED basics applied to horticulture lighting systems SourceContent:
- University of Washington Botanic Gardens
- Holst Memorial Lecture 2016
- IX Int Symposium on Light in Horticulture – Light for Life
- Shuyang Zhen wins graduate student competition at LightSym 2016
- IX International Symposium on Light in Horticulture
- Vi international Symposium on Light in Horticulture
University of Washington Botanic Gardens
Lighting from red and blue light-emitting diodes LEDs is common for crop production in controlled environments. Continuous application of red or blue light at night has been shown to suppress sporulation by Peronospora belbahrii , the causal organism of basil downy mildew DM , but the suppressing effects of intermittent applications of red and blue LEDs have not been thoroughly researched.
The two intermittent treatments consisted of one 4-hour exposure and three 1. At a given nighttime dose of light that did not completely suppress sporulation, continuous lighting was more effective than intermittent lighting, and for these partially suppressing doses, red LEDs were not significantly different from blue LEDs for suppressing sporulation. LED products for the horticulture market are predicted to further improve in terms of increased efficacy and decreased cost over the next 5 years Pattison et al.
For a given PPFD , many available LED horticultural luminaires enable growers to reduce the electrical power required for photosynthetic crop production from top lighting in controlled environments relative to incumbent HID luminaires Radetsky,The present study used commercial horticultural LED luminaires to examine the ability of red and blue LEDs to reduce DM disease pressure on basil commonly grown in controlled environments.
Patent ; Simon et al. Basil DM spreads via windborne spores and infected seeds or seedlings Farahani-Kofoet et al. Peronospora belbahrii sporulate at night Yarwood, ; however, sporulation can be inhibited if DM-infected leaves are exposed to sufficient amounts of broadband Cohen et al.
Continuous nighttime light exposures ranging from 3. In the context of maximizing lighting energy efficiency, the present study was designed to compare the efficacy of continuous nighttime narrowband LED exposures with shorter nighttime narrowband LED exposures for suppressing basil DM sporulation. Plants were grown indoors from seed at the Lighting Research Center until they had two pairs of leaves. A total of pots of sweet basil cultivar Genovese were planted for the experiments described herein.
As the seedlings sprouted and grew, they were thinned to maintain four plants per pot. These luminaires provided a PPFD ofEach narrowband spectral experiment with red or blue LEDs was conducted with 48 pots of basil, then repeated once 96 pots per spectrum. Each narrowband experiment had two irradiance levels and included a dark control. The plants were then moved to an indoor growing facility in Watervliet, NY, at 7 to 8 h postinfection. These luminaires provided an average PPFD ofEach night, for 10 consecutive nights, 12 pots of basil each containing four plants were moved into four 0.
Six pots, arranged in two rows of three pots along the length and width of each step, were placed on both steps. The boxes were open on top and on one side to allow ventilation. The LED luminaires were operated for 10 h at night to hr.
See Fig. The four treatment conditions used in the nighttime lighting experiments. Treatment 1: continuous darkness; Treatment 2: continuous lighting for 10 h of red or blue light; Treatment 3: 3 h of darkness, 4 h of red or blue light, and 3 h of darkness; and Treatment 4: 1.
Citation: HortScience horts 55, 4;The h light and temperature levels were continuously monitored using HOBO UA loggers Onset Computer Corporation, Bourne, MA that were placed on the lower step in each treatment box and on the bench under the fluorescent luminaires. The HOBO data loggers were spectrally corrected to provide continuous recordings of irradiance in the photosynthetic active radiation range. In no case were the lights inadvertently modulated during the h nighttime exposure periods.
Sporangia produced on the 11th night were collected from two arbitrarily selected pairs of leaves one pair of leaves from each plant per pot. In total, 24 leaves were sampled for each irradiance level within each nighttime lighting condition. The two detached basil leaves were gently placed in a mL centrifuge tube filled with 10 mL water.
All treatment data were normalized with respect to the dark control data collected at the same time to perform inferential statistics Minitab versionTo determine whether the repeated experimental data for each within-treatment condition [e. To account for multiple comparisons, a Bonferroni correction McGuigan, was used, and the criterion for a type I error was adjusted to a family error rate of 0. After the within-treatment data were combined, they were normalized to the combined dark control for that treatment, giving temporal profile relative to dark TPRD values, in percent, for the continuous condition Treatment 2 and for the two intermittent conditions Treatments 3 and 4.
A Tukey post hoc pairwise comparison was subsequently used to determine if there were statistical differences between the temporal profiles; post hoc comparisons were not needed for the two PPFD levels and the two spectra because the ANOVA already provided inferential statistics on these two factors. The interactions among these three factors were not significant. The post hoc Tukey comparisons indicated that continuous TPRD resulted in significantly lower sporulation than the two intermittent treatments Treatment 2 vs.
The TPRD data for the two intermittent treatments Treatments 3 and 4 were also combined because, again, they were not statistically different in terms of suppressing sporulation. Post hoc Tukey comparisons showed that the intermittent, lower dose A in Fig. Although the intermittent, higher dose Bi in Fig. Values are in percent of spores relative to the dark control. Error bars indicate standard errors of the mean. TPRD amounts that do not share a common letter A, B, or C are significantly different; Bi intermittent, higher dose and Bc continuous, lower dose are not statistically different.
Interpolated values for intermittent and continuous light exposures at the 0. To better assess the difference between continuous and intermittent light exposures for suppressing sporulation, the TPRD amount of sporulation resulting from the continuous, lower dose at 0.
Similarly, the TPRD amount of sporulation from the intermittent, higher dose at 0. For statistical comparison of sporulation suppression after continuous and intermittent exposures at 0. This same analysis was performed to statistically compare Ic to Bi, subtracting a constant value of 0. Thus, for both cases, a continuous dose is significantly better at suppressing basil DM than an estimated intermittent dose of the same amount.
Considering the energy efficiency improvements available with many horticultural LED luminaires relative to the incumbent HID systems, they may also be cost-effective for controlling basil DM sporulation at night. Indeed, previous studies have shown that continuous nighttime exposures to broadband and narrowband spectra ranging from 3. These continuous nighttime light levels can further increase basil yields in healthy plants Patel et al.
Importantly from an energy and cost perspective, nighttime light levels that successfully control DM sporulation are typically lower than those needed for basil production. Continuous nighttime light exposures from red and blue LED horticulture fixtures are obviously more expensive to operate than intermittent light exposures at the same electric power. Limiting the duration of darkness at night can be important, however, for controlling DM sporulation e.
In this regard, the primary aim of this study was to determine the relative effectiveness of commonly used horticulture LEDs if operated at night to control basil DM sporulation. Red and blue LEDs each provided equal nighttime irradiance levels of top lighting to DM-infected basil plants, but those irradiances were delivered using three temporal profiles: one continuous profile with 10 h of light and 0 h of dark Treatment 2 , one intermittent profile with 4 h of light and 6 h total of dark Treatment 3 , and one intermittent profile with three 1.
Where sporulation was not completely suppressed, continuous light exposures were more effective than the tested intermittent light exposures of the same dose Fig. Also, there was no significant difference in DM sporulation suppression between the two intermittent light exposure patterns used in the present study Treatment 3 vs.
Interestingly, the total energy i. It is clear that light-induced suppression of DM sporulation at night is complicated. At doses that do not completely suppress sporulation, the spectrum and amount of light as well as the duration of exposure interact in complex ways.
For example, intermittent light treatments that last less than 1 min compared with 10 min are more effective at partial inhibition e. Adding to the complications, for partial suppression of DM sporulation, there are conflicting results in the literature.
The present study showed that for equal doses, red light was not significantly different from blue light at suppressing basil DM sporulation. These finding are at odds with Cohen et al. Similarly, Cohen et al. Clearly more work is needed to understand these complicated interactions for partial suppression.
For a given top lighting dose that does not completely suppress sporulation e. Beaman, A. Cohen, Y. Plant Pathol. Cruickshank, I. The effect of light on the formation of conidia of Peronospora tabacina Adam Aust. Dou, H. Farahani-Kofoet, R. Garibaldi, A. Plant Dis. Gomez, C. Food 3Jones, M. Massa, G. McGuigan, F. Nordskog, B. Patel, J. Plant Sci.
Pattison, P. Radetsky, L. Simon, J. PatentYarwood, C. We also thank David Pedler for graphical assistance and Rebekah Mullaney from the LRC for copyediting and formatting the final manuscript. User Account Login to save searches and organize your favorite content.
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Holst Memorial Lecture 2016
His presentation is preceded by a session with Anna-Maria Carstensen, PhD candidate at Chalmers University of Technology, who is presenting findings on Exploring the dynamics of remotely detected fluorescence transients from Basil as a potential feedback for lighting control in greenhouses. Mistra is a Swedish organization, which seeks to promote sustainable development by investing in collaborations between researchers and industry — with the aim of solving important environmental problems. Presentations continue on Tuesday May 24rd when Dr. Karl-Johan Bergstrand from the Swedish University of Agricultural Sciences will present his research, Using short photoperiods and narrow-band lighting as a way of controlling growth in ornamental pot- and bedding plants, using the Heliospectra intelligent lighting system. For full program and abstracts please click here. All Heliospectra posters are available for download here. This proprietary setup gives growers the ability to control the intensity and wavelengths of the light emitted, creating a spectrum specifically adjusted to different plant species and growth stages to better facilitate photosynthesis.
Several horticultural crops, both traditional and non-traditional, are promising for local greenhouse International Symposium on Light in Horticulture.
IX Int Symposium on Light in Horticulture – Light for Life
The cost of providing lighting in greenhouses and plant factories can be high. In the case of variable electricity prices, providing most of the light when electricity prices are low can reduce costs. However, it is not clear how plants respond to the resulting fluctuating light levels. We hypothesized that plants that receive a constant photosynthetic photon flux density PPFD will produce more biomass than those grown under fluctuating light levels. The four treatments with the smallest PPFD fluctuations produced plants with similar numbers of leaves, chlorophyll content, specific leaf area SLA , dry mass, and leaf area. Chlorophyll content, A n , 30 , and dry mass were positively correlated with each other. Our results show that lettuce tolerates a wide range of fluctuating PPFD without negative effects on growth and development. The ability of lettuce to tolerate a wide range of fluctuating light levels suggests that PPFD can be adjusted in response to variable electricity pricing. Increased year-round demand for fresh fruits and vegetables has increased the need for productive and profitable controlled environment growing operations, such as greenhouses and plant factories.
Shuyang Zhen wins graduate student competition at LightSym 2016
He will also elaborate on the options that NEPC will offer to phenotype plants for photosynthetic efficiency. Rick van de Zedde will present the possibilities of automation and robotics for high-throughput phenotyping and precision horticulture. IPPN is an association representing the major plant phenotyping centers. IPPN aims to provide all relevant information about plant phenotyping.The goal is to increase the visibility and impact of plant phenotyping and enable cooperation by fostering communication between stakeholders in academia, industry, government, and the general public.
The Steering Committee is making plans for the program, which will feature presenters and topics intended to be covered in the postponed program.
IX International Symposium on Light in Horticulture
Addressing a multinational audience, Nassif spoke on trends in fresh fruit and vegetable consumption and how the industry is responding to evolving demands from buyers and consumers. Citing a recent survey from the Produce for Better Health Foundation, Nassif noted that while per capita consumption of produce has declined in recent years, there is a positive upward trend among younger demographics, which bodes well for the future. Even so, Nassif pointed out that Americans consume less than half of the daily recommended amount of fruits and vegetables, leading to substantial public health costs. However, the federal government does not place a high enough priority on programs that encourage increased produce consumption, according to Nassif. Case in point: While U. More and more, agriculture is being made to account for the environmental impacts of our operations, as evidence by the growing legislative, regulatory, and marketplace pressures being placed on the industry.
Vi international Symposium on Light in Horticulture
Hear from leading experts in the fields of retail, marketing, economics and all things lighting through virtual presentations and live question-and-answer sessions covering the topics you need to know to succeed in today's business climate. If you attended the symposium, simply log in on this page to view all the recorded session links. If you did not attend, but would still like to view the recorded sessions and corresponding question-and-answer sections, click the link below. You can purchase a package to access all twelve courses or individual sessions. Lower footfall. More promotional pricing. Lower margins. What if you looked at it as something that was happening for you?
VIII International Symposium on Light in Horticulture ; Publication date, ; ISBN, ; ISSN, (print)
His presentation is preceded by a session with Anna-Maria Carstensen, PhD candidate at Chalmers University of Technology, who is presenting findings on Exploring the dynamics of remotely detected fluorescence transients from Basil as a potential feedback for lighting control in greenhouses. Both findings were made possible by utilizing Heliospectra's intelligent LED plant growth light systems as a part of an ongoing project funded by Mistra. Mistra is a Swedish organization, which seeks to promote sustainable development by investing in collaborations between researchers and industry - with the aim of solving important environmental problems.RELATED VIDEO: MaxLite Webinars: Horticulture Lighting Solutions - May 21, 2020
Our speakers including three-minute talks will speak remotely through zoom. There will not be any in-person activity. Please see the updated program and zoom link information below to attend the webinar. For any further questions, please contact the organizing committee at unlplantbreeding gmail. Best wishes, Plant Science Organizing Committee. The Nebraska Plant Science Symposium is a part of a biennial series which began in
Concerns for interference in delivery systems and year-round availability of affordable high quality food from outside sources have promoted efforts to enhance local production.
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Supplemental lighting is proven to increase transplant growth and quality in vegetable nursery greenhouses. These ratios were evaluated under low and high daily solar light integrals DLI 8. Growth and morphological parameters including dry shoot mass, leaf count, stem diameter, hypocotyl length, leaf area, and chlorophyll concentration indicated the benefit of supplemental light, especially under low DLI, but there were no significant differences among different red:blue ratios regardless of DLI.