Search Results

You are looking at 101 - 110 of 695 items for :

  • dark���light cycles x
  • Refine by Access: User-accessible Content x
Clear All
Free access

Michael P. Dzakovich, Celina Gómez, Mario G. Ferruzzi, and Cary A. Mitchell

supplemental lighting. Moreover, solar radiation is comprised of 30% to 33% green light regardless of time of year ( Gómez and Mitchell, 2015 ). Green light has been shown to inhibit the action of cryptochrome, likely through modifying the photoreduction cycle

Full access

Allison Hurt, Roberto G. Lopez, and Joshua K. Craver

Seed propagation of bedding plants for spring markets commonly begins during the late winter months, when the greenhouse photosynthetic daily light integral (DLI) in northern latitudes can be as low as 1 to 5 mol·m –2 ·d –1 ( Pramuk and Runkle

Free access

Janni Bjerregaard Lund, Theo J. Blom, and Jesper Mazanti Aaslyng

One of the environmental concerns in the production of potted plants is the use of plant growth retardants (PGRs) for the control of plant height. In the search for alternatives to PGRs, changes in light quality [e.g., increased red to far

Free access

Jiffinvir Khosa, Robyn Lee, Srishti Joshi, Martin Shaw, John McCallum, and Richard Macknight

tubes, high-intensity discharge (HID) lamps, and light-emitting diodes (LEDs) are used as sources of light. Model plants, such as Arabidopsis and tomato, complete their life cycle normally under fluorescent tubes or HID lamps; however, these are not

Full access

Chase Jones-Baumgardt, David Llewellyn, Qinglu Ying, and Youbin Zheng

relevant crop production metrics to both instantaneous intensity of PAR , defined as the photosynthetic photon flux density ( PPFD , μmol·m −2 ·s −1 ), and accumulated light over the complete production cycle, defined as total light integral (TLI, mol·m −2

Free access

Christopher J. Currey and Roberto G. Lopez

dark respiration (μmol·m −2 ·s −1 ). In addition, the above equation was solved for the PPF (μmol·m −2 ·s −1 ) where P g = R d and P g = 0.95 × P gmax to determine the light compensation point (LCP) and light saturation point (LSP

Open access

Jack Olson and Matthew Clark

pattern to reduce shading from any adjacent plant. The light intensity within each growth chamber was calibrated and checked daily using an Apogee Instruments MQ-500 PAR reader (Logan, UT). All growth chambers were set at 16/8-h light cycles at a

Free access

Edward J. Nangle, David S. Gardner, James D. Metzger, Dominic P. Petrella, Tom K. Danneberger, Luis Rodriguez-Saona, and John L. Cisar

control and enhanced ultraviolet-B light conditions. ( A ) Perennial ryegrass. ( B ) Tall fescue. ( C ) Creeping bentgrass ‘L93’. ( D ) Creeping bentgrass ‘Penncross’. Data combined from two experiments for each grass. (1–9 scale, 1 = brown/dead, 9 = dark

Free access

Meijun Zhang, Duanduan Zhao, Zengqiang Ma, Xuedong Li, and Yulan Xiao

, especially α-naphthaleneacetic acid (NAA) added to the rooting medium. Tissue-cultured plantlets use the sugar in the medium as a carbon source, high light intensity is usually not necessary, and small airtight culture vessels must be used to avoid

Free access

Maureen M.M. Fitch, Terryl C.W. Leong, Xiaoling He, Heather R.K. McCafferty, Yun J. Zhu, Paul H. Moore, Dennis Gonsalves, Herb S. Aldwinckle, and Howard J. Atkinson

darkness at 26 °C as described by Chen and Kuehnle (1996) . Green plants were grown under cool-white fluorescent laboratory lights (10 μmol·m −2 ·s −1 ) in 200-mL jars of Medium #1A. Etiolated and light-grown differentiated tissues used for cocultivation