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Annals of Botany 75: 605-607, 1995
© 1995 Annals of Botany Company

The Detection of the Accumulation of Silicon in Phalaenopsis (Orchidaceae)

Tian-Su Zhuo

Gunma Center, Agribusiness Division, Sapporo Breweries Ltd. 37-1, Kizaki, Nitta, Gunma, Japan 370-03

Small particles along the veins of leaves in Phalaenopsis contain silicon. The silica bodies are spherical in shape and 5-20 µm in diameter. In the in vitro cultured plantlets, they grow differently in size, depending on the developmental stage of the plantlets and the concentration of silicon added to the medium. The growth of the silica body was increased by increasing the concentration of CaSiO3 from 0·01 to 0·5 mg l-1 and was maximized from 0·5 to 1·0 mg l-1. In the medium with 1·0 mg l-1 CaSiO3, they grew to a size larger than that of the greenhouse plants after 6 months in culture. The sensitivity of the growth of the silica bodies to the environmental concentration of silicon was then suggested to be a useful indicator for studying the uptake of silicon in plants.Copyright 1995, 1999 Academic Press

Phalaenopsis, Orchidaceae, silica body, stegmata


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