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Kuo-Tan Li and Jim Syvertsen

Young citrus trees and seedlings in Florida's commercial nurseries are often grown under shade cloth netting to avoid high light and temperature. To investigate the potential benefit of altering radiation by colored shade nets, `Cleopatra' mandarin (Cleo, C. reticulata Blanco) seedlings and potted `Valencia' trees [Citrus sinensis (L.) Osbeck] on Cleo or Carrizo [Carr, C. sinensis × Poncirus trifoliate (L.) Raf.] rootstocks were grown in full sun or under 50% shade from blue, black, silver, grey, and red colored shade nets. Changes in photosynthetically active radiation (PAR) and temperatures under the shade were monitored. Leaf function and leaf chlorophyll contents were measured, and plants were harvested by the end of the experiment for shoot and root growth measurements. Plants under the shade received an average of 45% PAR and had lower mid-day leaf temperature than plants in full sun. Plants under blue nets had greatest leaf chlorophyll a, b, and total chlorophyll content, whereas those under red nets had the lowest. However, shading improved photosystem II efficiency from measurements of leaf chlorophyll fluorescence (Fv/Fm) regardless of the color of shade nets. Shading increased shoot growth, shoot to root ratio, and total plant dry weight of Cleo seedlings, especially those under silver nets.

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Osama Mohawesh, Ammar Albalasmeh, Sanjit Deb, Sukhbir Singh, Catherine Simpson, Nour AlKafaween, and Atif Mahadeen

( Möller and Assouline, 2007 ; Rylski and Spigelman, 1986 ). Table 2. Effects of the colored shading net (with 50% shading intensity) on sweet pepper mean plant height, leaf area (LA), chlorophyll content, and leaf water potential (LWP) at the

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Juan Carlos Díaz-Pérez and Kelly St. John

horticultural crops, although there is limited information on bell pepper ( Stamps, 2009 ). The objective of our work was to determine the effects of colored shade nets on plant growth, leaf gas exchange, and leaf pigments of field-grown bell pepper. Materials

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Tongyin Li, Guihong Bi, Judson LeCompte, T. Casey Barickman, and Bill B. Evans

objectives of this study were to investigate the effect of colored shadecloth on: 1) growth and yield of lettuce and snapdragon, 2) physiological activities of lettuce and snapdragon, and 3) flavonoid content in lettuce leaf tissue. Materials and methods

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Ryan J. Hayes, Mark A. Trent, Beiquan Mou, Ivan Simko, Samantha J. Gebben, and Carolee T. Bull

. Consequently, baby leaf crops with BLS may be abandoned resulting in loss of the entire crop. Initial symptoms on cultivars with red-colored leaves can be difficult to detect in the early stages of disease development but may develop further during post

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W. Garrett Owen

. Nutrient concentrations differed among cultivars with black- (‘Black Beauty’), red- (‘Cherry Cola’), orange- (‘Marmalade’), and green-colored leaves (‘Peppermint Spice’). No leaf tissue concentration limits have been published for H. hybrida , but survey

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Jack Olson and Matthew Clark

variegation-induced changes to leaf anatomy and plastid structure resulting in different colored leaf tissue. Because variegated leaves express different colors than the normal phenotype, researchers have examined whether there are changes in content of

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Kristine M. Lang, Ajay Nair, and Kenneth J. Moore

( Table 13 ). Table 13. Effect of cultivar and shade treatments on mean plant height, shoot biomass, number of leaves per plant, leaf area per plant, and leaf size of seven colored bell pepper cultivars grown in high tunnels with no shadecloth treatment

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Steven P. Arthurs, Robert H. Stamps, and Frank F. Giglia

, growers are experimenting with colored, gray, and white dispersive netting in an attempt to impact vegetative vigor, dwarfing, branching, leaf variegation, and timing of flowering ( Leite et al., 2008 ; Oren-Shamir et al., 2000 ; Stamps, 2009 ). The use

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Christopher S. Cramer, Narinder Singh, Neel Kamal, and Hanu R. Pappu

amount of epicuticular leaf wax tend to have blue-colored foliage. Diaz-Montano et al. (2012) observed that two cultivars, Yankee and Nebula, had significantly higher numbers of thrips larvae as compared with other cultivars. Both of these cultivars