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Yin-Tung Wang

1 Professor. This research was support in part by a grant from the American Orchid Society and by private donations. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper

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Tracie K. Matsumoto

1 E-mail tmatsumoto@pbarc.ars.usda.gov . The author thanks James Fang of Hilo Orchid Farm Hawaii, for kindly donating the plants and use of greenhouse facilities; Ivan Komoda for helpful discussion on

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Linsey A. Newton and Erik S. Runkle

( Syngenta Crop Protection, 2002 ). Moth orchids, which are the most common potted flowering orchids sold in the United States ( Griesbach, 2002 ), develop inflorescences from buds on the leaf nodes of their compressed stems. Some clones have very tall

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Anakkaorn Wannajindaporn, Chitpan Kativat, and Piyada Alisha Tantasawat

Dendrobium ‘Earsakul’ is one of the most important commercial orchids in Thailand, which is one of the world’s largest orchid producers and exporters ( Luan et al., 2006 ). At present, new Dendrobium ‘Earsakul’ varieties with improved flower

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L.Y. Lim and C.S. Hew

The kinetics and efficiency of uptake of minerals (ammonium, nitrate, phosphate, potassium, calcium and magnesium) by roots of three tropical orchid genera (Aranda, Dendrobium and Oncidium) were studied and compared. Mericloned plantlets of these three orchids were cultured in solid Vacin and Went medium. The pattern of mineral uptake by orchids of these three orchid genera was similar. There was a preferential uptake of ammonia over nitrate. Rapid nitrate uptake by roots began only after 3 weeks in culture. Initial uptake of potassium, calcium and magnesium were rapid but the residual levels of these minerals either remained constant (Mg, PO4) or increased (K, Ca) after the 4th week. The % of uptake for ammonium nitrate, phosphate, potassium, calcium and magnesium over 9 weeks of culture was 60-76%, 24-28%, 12.8-27%, 17–30%, 17-26% respectively for the three orchid genera. A good correlation between growth of plantlets and uptrake was observed.

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Nittaya Chookoh, Yi-Tien Chiu, Chen Chang, Wei-Hsin Hu, and Ting-En Dai

The group of orchids now called tolumnia was once called Oncidium section Variegata and was commonly referred to as the “equitant oncidiums” ( Aldrich, 1994 ). Plants in this genus are endemic to the Caribbean islands. These plants are miniature

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Alice Mweetwa, David Tay, and Gregory Welbaum

Orchids are important ornamental, food, and medicinal plants. Orchid germplasm preservation is important because some species are endangered due to loss of habitat and human predation. Very few of the world's genebanks are involved in orchid preservation. Orchid germplasm preservation is a priority for the USDA Ornamental Plant Germplasm Center in Columbus, Ohio. Brassia and Phalaenopsis seeds were harvested at different stages of development and stored at –196 °C (liquid nitrogen), –80, –18, 4, and 25 °C for 6, 12, 18, and 24 months to determine the optimum conditions for long-term seed storage. Phalaenopsis and Brassia seeds adjusted to 45.5% RH over chromium dichromate were able to survive 10-d storage. Seeds frozen in liquid nitrogen for 30 min were able to germinate and produce protocorms 19 d after sowing, just a day longer than control seeds. Liquid nitrogen storage also improved germination of some Phalaenopsis seed lots from 0 (control) to 38%. Storing Phalaenopsis seeds at –80 and 4 °C also improved germination similarly, suggesting dormancy was broken by low-temperature seed treatments. On the other hand, seeds stored at 25 °C did not germinate. Preliminary results suggest that orchid seeds tolerate freezing even in liquid nitrogen and that cryopreservation may be a viable long-term strategy for orchid germplasm preservation.

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Yin-Tung Wang and Yao-Chien Alex Chang

, 2007 ). Increasing N concentration to 400 mg·L −1 , in conjunction with other minerals, can be detrimental to phalaenopsis ( Wang, 2003 ; Yao, 2007 ). Fig. 1. Response of phalaenopsis orchid to various concentrations of nitrogen–phosphorus–potassium (N

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Rasika G. Mudalige and Adelheid R. Kuehnle

1 To whom reprint requests should be addressed. E-mail address: heidi@hawaii.edu . This paper is based on the invited presentation at the 98th American Society of Horticultural Science Annual Conference, Orchid

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Yung-I. Lee, Chia-Fu Lu, Mei-Chu Chung, Edward C. Yeung, and Nean Lee

The flowers of Calanthe tricarinata , one of the most beautiful native terrestrial orchids in Taiwan, have deep-green sepals and petals with a scarlet labellum. This species has shown potential in the nursery trade and is used as a breeding stock