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Kevin M. Folta and Kayla Shea Childers

Plant growth and developmental processes are regulated by light quality (color, wavelength), quantity (fluence rate), and photoperiod (duration of illumination). Together these three parameters strongly influence traits of horticultural interest

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Martin P.N. Gent

Composition of the shoot tissue of lettuce changes with environment. Light intensity or daily light integral affects the concentrations of nitrate, sugars, and other metabolites in various leafy green vegetables, including lettuce and spinach

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Qingqing Duan, Ye Lin, Wu Jiang, and Danfeng Huang

decrease the quality caused by temperature and light stress. Providing light during storage could extend the storability of seedlings of many horticultural species, even at very low light intensity ( Justus and Kubota, 2010 ; Kubota et al., 2002 ; Park

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Vincent Martineau, Mark Lefsrud, Most Tahera Naznin, and Dean A. Kopsell

level for being considered as a replacement to HPS lamps in hydroponics growth environments. LED lamps are anticipated to replace HPS lamps in most applications as a result of their reduced electricity consumption, improved quality of light, and the

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Angela M. Madeiras, Thomas H. Boyle, and Wesley R. Autio

(temperature not specified) before cold stratification ( Baskin and Baskin, 2005 ). In some species, cold stratification can replace a light requirement for germination ( Bewley and Black, 1994 ). Recent studies have revealed that cold stratification has a

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N. C. Peterson and T. M. Blessington

Abstract

Ficus benjamina was maintained 10 weeks in a simulated interior environment (SIE) with a controlled temperature of 21°C ± 1° under either 15 µEm-2sec-1 photosynthetically active radiation (PAR) from Cool White fluorescent (CWF) lamps or 15 µEm-2sec-1 (PAR) from incandescent (INC) lamps after receiving no light for various time periods (0, 4, 8 and 12 days). Plants held under CWF had a decrease in chlorophyll content and increase in leaf drop with increased days in dark. Quality as determined by leaf retention and plant grade indicated that those plants receiving 8 and 12 days dark storage and held under CWF lamps lost more leaves and were not salable after 10 weeks in SIE. Most plants held under INC lamps had no decrease in chlorophyll content, retained more leaves, and maintained good plant grade regardless of days in dark storage.

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Tim D. Davis and John R. Potter

Abstract

Leafy cuttings of Rhododendron catawbiense Michx. ‘Roseum Elegans’ were rooted under 0%, 55%, or 95% shade in a greenhouse. Compared to the low-light treatment, higher light induced high photosynthetic rates, high sucrose and starch levels, and low leaf water potential, but these differences only persisted for the initial part of the 23-week rooting period and did not influence subsequent rooting percentage. However, in cuttings receiving 95% shade, dry weights of leaves and stems and rootball size were relatively small after 23 weeks, suggesting that growth was reduced by lack of photosynthate. The reduced size of cuttings rooted under 95% shade apparently did not affect vigor because the size of the above-ground portion of all plants was equal after 2 months of growth in a greenhouse.

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Yingtao Ma, Mengmeng Zhao, Hongxia Wu, Congying Yuan, Huiyun Li, and Yanzhao Zhang

harvest is not good for color development in fruit skin. Previous studies have indicated that bagging with a light-impermeable bag significantly lowers anthocyanin concentrations in apple ( Malus domestica ) peels ( Feng et al., 2014 ). The visual

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Joshua K. Craver, Joshua R. Gerovac, Roberto G. Lopez, and Dean A. Kopsell

to high levels of antioxidant and anticarcinogenic activity ( Podsędek, 2007 ; Stoewsand, 1995 ). Light, amongst various other environmental factors, is one of the most important variables in influencing phytochemical concentrations within the plant

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Liang Zheng, Huaming He, and Weitang Song

Light is one of the most important environmental factors that influence plant growth and development. Light energy is captured by higher plants during photosynthesis, whereas light signaling plays primary roles in plant morphogenesis ( Abidi et al