The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform

Lightmart - One of the best experts on this subject based on the ideXlab platform.

Zhen Chao Yang - One of the best experts on this subject based on the ideXlab platform.

  • effect of end of day far red Light from a movable led Fixture on squash rootstock hypocotyl elongation
    Scientia Horticulturae, 2012
    Co-Authors: Zhen Chao Yang, Chieri Kubota, Po Lung Chia, Murat Kacira
    Abstract:

    Abstract Effects of end-of-day far-red (EOD-FR) Light on hypocotyl elongation of a commercial cucurbit rootstock were investigated using movable and stationary Light Fixtures, since adequate hypocotyl length is required in vegetable grafting. Seedlings of an interspecific squash ‘Tetsukabuto’ (Cucurbita maxima x Cucurbita moschata) were grown in greenhouse and subject to daily EOD-FR Light treatments with various application methods. The response of seedling hypocotyl length was well described using a Michaelis–Menten-type saturation curve over the range of 0–8.8 mmol m−2 d−1 FR Light doses, as we previously reported for tomato rootstocks. Using a near saturating dose of 4.0 mmol m−2 d−1 FR Light, efficacy of a movable FR Light Fixture for EOD-FR Light treatment was compared with that of a stationary FR Light Fixture. The movable Light Fixture was a 120-cm metal bar equipped with FR Light emitting diodes (LEDs) and the application was tested at two different traveling speeds (0.78 and 3.13 mm s−1) with one and four repeated applications per day, respectively, to reach the same target FR Light dose (4.0 mmol m−2 d−1). Regardless of traveling speed, the extent of hypocotyl elongation under the moving FR LED Fixture was statistically the same as that under stationary LED Fixture and was 55–69% greater than non-treated control, suggesting that EOD-FR Light applications can be designed flexibly. As far as we are aware, this is the first paper demonstrating the effect of EOD Light quality treatment using moving Light Fixtures.

  • effect of end of day far red Light from a movable led Fixture on squash rootstock hypocotyl elongation
    Scientia Horticulturae, 2012
    Co-Authors: Zhen Chao Yang, Chieri Kubota, Po Lung Chia, Murat Kacira
    Abstract:

    Abstract Effects of end-of-day far-red (EOD-FR) Light on hypocotyl elongation of a commercial cucurbit rootstock were investigated using movable and stationary Light Fixtures, since adequate hypocotyl length is required in vegetable grafting. Seedlings of an interspecific squash ‘Tetsukabuto’ (Cucurbita maxima x Cucurbita moschata) were grown in greenhouse and subject to daily EOD-FR Light treatments with various application methods. The response of seedling hypocotyl length was well described using a Michaelis–Menten-type saturation curve over the range of 0–8.8 mmol m−2 d−1 FR Light doses, as we previously reported for tomato rootstocks. Using a near saturating dose of 4.0 mmol m−2 d−1 FR Light, efficacy of a movable FR Light Fixture for EOD-FR Light treatment was compared with that of a stationary FR Light Fixture. The movable Light Fixture was a 120-cm metal bar equipped with FR Light emitting diodes (LEDs) and the application was tested at two different traveling speeds (0.78 and 3.13 mm s−1) with one and four repeated applications per day, respectively, to reach the same target FR Light dose (4.0 mmol m−2 d−1). Regardless of traveling speed, the extent of hypocotyl elongation under the moving FR LED Fixture was statistically the same as that under stationary LED Fixture and was 55–69% greater than non-treated control, suggesting that EOD-FR Light applications can be designed flexibly. As far as we are aware, this is the first paper demonstrating the effect of EOD Light quality treatment using moving Light Fixtures.

Julia C Sager - One of the best experts on this subject based on the ideXlab platform.

  • Design and fabrication of adjustable red-green-blue LED Light arrays for plant research
    BMC Plant Biology, 2005
    Co-Authors: Kevin M. Folta, Ryan Mcmorrow, J. Dustin Kenitz, Raymond Wheeler, Hyeon Hye Kim, Leonard L Koss, Julia C Sager
    Abstract:

    BACKGROUND: Although specific Light attributes, such as color and fluence rate, influence plant growth and development, researchers generally cannot control the fine spectral conditions of artificial plant-growth environments. Plant growth chambers are typically outfitted with fluorescent and/or incandescent Fixtures that provide a general spectrum that is accommodating to the human eye and not necessarily supportive to plant development. Many studies over the last several decades, primarily in Arabidopsis thaliana, have clearly shown that variation in Light quantity, quality and photoperiod can be manipulated to affect growth and control developmental transitions. Light emitting diodes (LEDs) has been used for decades to test plant responses to narrow-bandwidth Light. LEDs are particularly well suited for plant growth chambers, as they have an extraordinary life (about 100,000 hours), require little maintenance, and use negligible energy. These factors render LED-based Light strategies particularly appropriate for space-biology as well as terrestrial applications. However, there is a need for a versatile and inexpensive LED array platform where individual wavebands can be specifically tuned to produce a series of Light combinations consisting of various quantities and qualities of individual wavelengths. Two plans are presented in this report. RESULTS: In this technical report we describe the practical construction of tunable red-green-blue LED arrays to support research in plant growth and development. Two Light Fixture designs and corresponding circuitry are presented. The first is well suited for a laboratory environment for use in a finite area with small plants, such as Arabidopsis. The second is expandable and appropriate for growth chambers. The application of these arrays to early plant developmental studies has been validated with assays of hypocotyl growth inhibition/promotion and phototropic curvature in Arabidopsis seedlings. CONCLUSION: The presentation of these proven plans for LED array construction allows the teacher, researcher or electronics aficionado a means to inexpensively build efficient, adjustable Lighting modules for plant research. These simple and effective designs permit the construction of useful tools by programs short on electronics expertise. These arrays represent a means to modulate precise quality and quantity in experimental settings to test the effect of specific Light combinations in regulating plant growth, development and plant-product yield.

Murat Kacira - One of the best experts on this subject based on the ideXlab platform.

  • effect of end of day far red Light from a movable led Fixture on squash rootstock hypocotyl elongation
    Scientia Horticulturae, 2012
    Co-Authors: Zhen Chao Yang, Chieri Kubota, Po Lung Chia, Murat Kacira
    Abstract:

    Abstract Effects of end-of-day far-red (EOD-FR) Light on hypocotyl elongation of a commercial cucurbit rootstock were investigated using movable and stationary Light Fixtures, since adequate hypocotyl length is required in vegetable grafting. Seedlings of an interspecific squash ‘Tetsukabuto’ (Cucurbita maxima x Cucurbita moschata) were grown in greenhouse and subject to daily EOD-FR Light treatments with various application methods. The response of seedling hypocotyl length was well described using a Michaelis–Menten-type saturation curve over the range of 0–8.8 mmol m−2 d−1 FR Light doses, as we previously reported for tomato rootstocks. Using a near saturating dose of 4.0 mmol m−2 d−1 FR Light, efficacy of a movable FR Light Fixture for EOD-FR Light treatment was compared with that of a stationary FR Light Fixture. The movable Light Fixture was a 120-cm metal bar equipped with FR Light emitting diodes (LEDs) and the application was tested at two different traveling speeds (0.78 and 3.13 mm s−1) with one and four repeated applications per day, respectively, to reach the same target FR Light dose (4.0 mmol m−2 d−1). Regardless of traveling speed, the extent of hypocotyl elongation under the moving FR LED Fixture was statistically the same as that under stationary LED Fixture and was 55–69% greater than non-treated control, suggesting that EOD-FR Light applications can be designed flexibly. As far as we are aware, this is the first paper demonstrating the effect of EOD Light quality treatment using moving Light Fixtures.

  • effect of end of day far red Light from a movable led Fixture on squash rootstock hypocotyl elongation
    Scientia Horticulturae, 2012
    Co-Authors: Zhen Chao Yang, Chieri Kubota, Po Lung Chia, Murat Kacira
    Abstract:

    Abstract Effects of end-of-day far-red (EOD-FR) Light on hypocotyl elongation of a commercial cucurbit rootstock were investigated using movable and stationary Light Fixtures, since adequate hypocotyl length is required in vegetable grafting. Seedlings of an interspecific squash ‘Tetsukabuto’ (Cucurbita maxima x Cucurbita moschata) were grown in greenhouse and subject to daily EOD-FR Light treatments with various application methods. The response of seedling hypocotyl length was well described using a Michaelis–Menten-type saturation curve over the range of 0–8.8 mmol m−2 d−1 FR Light doses, as we previously reported for tomato rootstocks. Using a near saturating dose of 4.0 mmol m−2 d−1 FR Light, efficacy of a movable FR Light Fixture for EOD-FR Light treatment was compared with that of a stationary FR Light Fixture. The movable Light Fixture was a 120-cm metal bar equipped with FR Light emitting diodes (LEDs) and the application was tested at two different traveling speeds (0.78 and 3.13 mm s−1) with one and four repeated applications per day, respectively, to reach the same target FR Light dose (4.0 mmol m−2 d−1). Regardless of traveling speed, the extent of hypocotyl elongation under the moving FR LED Fixture was statistically the same as that under stationary LED Fixture and was 55–69% greater than non-treated control, suggesting that EOD-FR Light applications can be designed flexibly. As far as we are aware, this is the first paper demonstrating the effect of EOD Light quality treatment using moving Light Fixtures.

Kevin M. Folta - One of the best experts on this subject based on the ideXlab platform.

  • Design and fabrication of adjustable red-green-blue LED Light arrays for plant research
    BMC Plant Biology, 2005
    Co-Authors: Kevin M. Folta, Ryan Mcmorrow, J. Dustin Kenitz, Raymond Wheeler, Hyeon Hye Kim, Leonard L Koss, Julia C Sager
    Abstract:

    BACKGROUND: Although specific Light attributes, such as color and fluence rate, influence plant growth and development, researchers generally cannot control the fine spectral conditions of artificial plant-growth environments. Plant growth chambers are typically outfitted with fluorescent and/or incandescent Fixtures that provide a general spectrum that is accommodating to the human eye and not necessarily supportive to plant development. Many studies over the last several decades, primarily in Arabidopsis thaliana, have clearly shown that variation in Light quantity, quality and photoperiod can be manipulated to affect growth and control developmental transitions. Light emitting diodes (LEDs) has been used for decades to test plant responses to narrow-bandwidth Light. LEDs are particularly well suited for plant growth chambers, as they have an extraordinary life (about 100,000 hours), require little maintenance, and use negligible energy. These factors render LED-based Light strategies particularly appropriate for space-biology as well as terrestrial applications. However, there is a need for a versatile and inexpensive LED array platform where individual wavebands can be specifically tuned to produce a series of Light combinations consisting of various quantities and qualities of individual wavelengths. Two plans are presented in this report. RESULTS: In this technical report we describe the practical construction of tunable red-green-blue LED arrays to support research in plant growth and development. Two Light Fixture designs and corresponding circuitry are presented. The first is well suited for a laboratory environment for use in a finite area with small plants, such as Arabidopsis. The second is expandable and appropriate for growth chambers. The application of these arrays to early plant developmental studies has been validated with assays of hypocotyl growth inhibition/promotion and phototropic curvature in Arabidopsis seedlings. CONCLUSION: The presentation of these proven plans for LED array construction allows the teacher, researcher or electronics aficionado a means to inexpensively build efficient, adjustable Lighting modules for plant research. These simple and effective designs permit the construction of useful tools by programs short on electronics expertise. These arrays represent a means to modulate precise quality and quantity in experimental settings to test the effect of specific Light combinations in regulating plant growth, development and plant-product yield.