Continuous and Intermittent Light at Night, Using Red and Blue LEDs to Suppress Basil Downy Mildew Sporulation
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...
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| Format: | Article |
| Language: | English |
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American Society for Horticultural Science (ASHS)
2020-02-01
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| Series: | HortScience |
| Subjects: | |
| Online Access: | https://journals.ashs.org/hortsci/view/journals/hortsci/55/4/article-p483.xml |
| _version_ | 1818415167754469376 |
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| author | Leora Radetsky Jaimin S. Patel Mark S. Rea |
| author_facet | Leora Radetsky Jaimin S. Patel Mark S. Rea |
| author_sort | Leora Radetsky |
| collection | DOAJ |
| description | 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. This study examined the effects of red (λmax = 670 nm) and blue (λmax = 458 nm) LED top lighting, at two photosynthetic photon flux densities (PPFD = ≈12 and ≈60 µmol·m−2·s−1), using continuous (10-hour) nighttime and two intermittent nighttime exposures, to suppress basil DM sporulation. The two intermittent treatments consisted of one 4-hour exposure and three 1.3-hour exposures spaced 3 hours apart. Continuous nighttime treatments with blue or red LED top lighting at ≈60 µmol·m−2·s−1 were able to suppress basil DM sporulation by more than 99%. 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. The present study showed that horticultural lighting systems using red and blue LEDs to grow crops during the day can also be used at night to suppress basil DM sporulation by up to 100%. |
| first_indexed | 2024-12-14T11:30:42Z |
| format | Article |
| id | doaj.art-34c2bbdf7216468693d81aaf0d42cb43 |
| institution | Directory Open Access Journal |
| issn | 2327-9834 |
| language | English |
| last_indexed | 2024-12-14T11:30:42Z |
| publishDate | 2020-02-01 |
| publisher | American Society for Horticultural Science (ASHS) |
| record_format | Article |
| series | HortScience |
| spelling | doaj.art-34c2bbdf7216468693d81aaf0d42cb432022-12-21T23:03:18ZengAmerican Society for Horticultural Science (ASHS)HortScience2327-98342020-02-01554483486https://doi.org/10.21273/HORTSCI14822-19Continuous and Intermittent Light at Night, Using Red and Blue LEDs to Suppress Basil Downy Mildew SporulationLeora RadetskyJaimin S. PatelMark S. Rea 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. This study examined the effects of red (λmax = 670 nm) and blue (λmax = 458 nm) LED top lighting, at two photosynthetic photon flux densities (PPFD = ≈12 and ≈60 µmol·m−2·s−1), using continuous (10-hour) nighttime and two intermittent nighttime exposures, to suppress basil DM sporulation. The two intermittent treatments consisted of one 4-hour exposure and three 1.3-hour exposures spaced 3 hours apart. Continuous nighttime treatments with blue or red LED top lighting at ≈60 µmol·m−2·s−1 were able to suppress basil DM sporulation by more than 99%. 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. The present study showed that horticultural lighting systems using red and blue LEDs to grow crops during the day can also be used at night to suppress basil DM sporulation by up to 100%.https://journals.ashs.org/hortsci/view/journals/hortsci/55/4/article-p483.xmlbasil; controlled-environment agriculture; intermittent lighting; leds; peronospora belbahrii |
| spellingShingle | Leora Radetsky Jaimin S. Patel Mark S. Rea Continuous and Intermittent Light at Night, Using Red and Blue LEDs to Suppress Basil Downy Mildew Sporulation HortScience basil; controlled-environment agriculture; intermittent lighting; leds; peronospora belbahrii |
| title | Continuous and Intermittent Light at Night, Using Red and Blue LEDs to Suppress Basil Downy Mildew Sporulation |
| title_full | Continuous and Intermittent Light at Night, Using Red and Blue LEDs to Suppress Basil Downy Mildew Sporulation |
| title_fullStr | Continuous and Intermittent Light at Night, Using Red and Blue LEDs to Suppress Basil Downy Mildew Sporulation |
| title_full_unstemmed | Continuous and Intermittent Light at Night, Using Red and Blue LEDs to Suppress Basil Downy Mildew Sporulation |
| title_short | Continuous and Intermittent Light at Night, Using Red and Blue LEDs to Suppress Basil Downy Mildew Sporulation |
| title_sort | continuous and intermittent light at night using red and blue leds to suppress basil downy mildew sporulation |
| topic | basil; controlled-environment agriculture; intermittent lighting; leds; peronospora belbahrii |
| url | https://journals.ashs.org/hortsci/view/journals/hortsci/55/4/article-p483.xml |
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