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Renata Goossen and Kimberly A. Williams

. Specifically, H 2 O 2 is used by many consumers and orchid (Orchidaceae) enthusiasts as a treatment for root decay, presumed to be caused by root rot pathogens, in orchids (e.g., Bottom, 2017 ; Miss Orchid Girl, 2014 ). In agricultural production systems, H

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Marco A. Palma, Yu-Jen Chen, Charles Hall, David Bessler, and David Leatham

Orchids are the fastest-growing group of potted flowering plants in the United States in terms of sales, ranked second behind poinsettia ( Euphorbia pulcherrima ) among all potted flowering plants. Southern and western states are the main producing

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Wagner A. Vendrame, Aaron J. Palmateer, Ania Pinares, Kimberly A. Moore, and Lawrence E. Datnoff

ornamental plants, orchid production has increased over the past 10 years as a result of their popularity, the rapid expansion of the market, and the interest of growers and customers for new and improved hybrids. By 2004, orchids ranked second among potted

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Matthew G. Blanchard and Erik S. Runkle

Orchids are the second most valuable potted flowering plant in the United States with a reported wholesale value of $123 million in 2006, an increase of 162% in the past decade ( U.S. Department of Agriculture, 2007 ). In 2006, 14.7 million potted

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Yin-Tung Wang

1 Associate Professor of Floriculture. Orchid plants were donated by Taiwan Sugar Corp., Taipei, Taiwan, Republic of China. Lori L. Gregg's assistance is greatly appreciated. The cost of publishing this paper was

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Chairani Siregar

Orchids are members of the Orchidaceae, the largest family among flowering plants, which includes 25,000 species from 850 genera. It is estimated that 2500 to 3000 orchid species grow in the forests of Borneo ( Irawati, 2002 ). In their natural

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C.S. Hew, L.Y. Lim, and C.M. Low

The uptake of nitrate and ammonium by a terrestial (Bromheadia finlaysonia) and an epiphytic (Dendrobium hybrid) orchid in solution culture has been studied. The rates of nitrate and ammonium were relatively linear, with higher rate of uptake for ammonium. The rates of nitrate uptake in terrestial and epiphytic orchids were 0.4 and 0.9 μmole gm fw-1 hr-1 respectively and they were considerably lower than those of most major crops. SEM studies show that the velamen of Bromheadia was 2 cells thick whereas that of Dendrobium was 8-10 cells thick. It is unlikely that the velamen is the major factor in restricting influx of nitrate or ammonium. Nitrate reductase (NR) and glutamine synthetase (GS) were present in roots and leaves of both orchids. NR was high in roots but low in leaves. The reverse was for GS. The activities of NR and GS was low but high enough to account for the rate of nitrate or ammonium uptake. It appears that the movement of ions across the transfer junction at the exodermis plays a major regulatory role in ion uptake by orchid root.

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Kaylee A. South, Paul A. Thomas, Marc W. van Iersel, Cindy Young, and Michelle L. Jones

Orchids are currently the top-selling potted flowering plant in the United States because of their long flower life and compact growth ( Banks, 2005 ; Fitch, 2004 ; USDA, 2016 ). While the popularity of many potted plants is declining, the number

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Linsey A. Newton and Erik S. Runkle

Orchids have become a popular and economically important potted flowering plant in the past decade. In 2007, the U.S. Department of Agriculture (USDA) reported that 15.4 million potted orchids, with a total wholesale value of $126 million, were

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Peter J. Zale, Melissa K. McCormick, and Dennis F. Whigham

More than 220 temperate orchid species occur in North America north of Mexico and ≈150 are terrestrial, but the requirements for horticultural production and cultivation are known for few species ( Luer, 1975 ; Swarts and Dixon, 2017