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NUTRITIONAL REQUIREMENTS FOR IN VITRO SEED GERMINATION OF 12 TERRESTRIAL, LITHOPHYTIC AND EPIPHYTIC ORCHIDS

J Nadarajan, S Wood, TR Marks, PT Seaton and HW Pritchard
Journal of Tropical Forest Science
Vol. 23, No. 2 (April 2011), pp. 204-212
Stable URL: http://www.jstor.org/stable/23616921
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
NUTRITIONAL REQUIREMENTS FOR IN VITRO SEED GERMINATION OF 12 TERRESTRIAL, LITHOPHYTIC AND EPIPHYTIC ORCHIDS
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Abstract

Although numerous media have been developed to evaluate both orchid seed germination and further seedling development after storage, few studies have attempted to relate nutritional requirements to life history traits. For a range of terrestrial, lithophytic and epiphytic orchid species, comparisons were made of germination on Knudson C, with and without activated charcoal or banana powder, Norstog and Phytamax™ media to represent variations in available nitrogen. Germination varied, with maximum values ranging from just 9% for Prosthechea cochleata, Platanthera sp. and Spathoglottis paulinae to 95% for Phragmapedium longifolium. Along with Paphiopedilum delenatii, Paphiopedilum philippinense and the epiphyte Guarianthe bowringiana, P. longifolium germinated well on most media. Germination was significantly higher on Norstog than the other media for four of the six epiphytes tested. Germination was maximum on Knudson C medium with activated charcoal for four of the six terrestrial/lithophyte species. The results indicate a greater preference for nitrogen from amino acids rather than ammonium or nitrate salts in seeds of epiphytes compared with some terrestrial orchid species. Walaupun pelbagai medium telah dibangunkan untuk menilai percambahan biji benih orkid selepas penyimpanan dan pertumbuhan anak benihnya, hanya beberapa kajian sahaja yang cuba menyelidiki perhubungan keperluan nutrien orkid dengan ciri riwayat hidupnya. Percambahan orkid daratan, litofit dan epifit di atas medium berlainan yang mewakili kandungan nitrogen berlainan dikaji. Medium yang digunakan ialah Knudson C tanpa arang teraktif, Knudson C + arang teraktif, Knudson C + serbuk pisang, Norstog dan Phytamax™. Percambahan maksimum berjulat daripada 9% untuk Prosthechea cochleata, Platanthera sp. dan Spathoglottis paulinae hingga 95% untuk Phragmapedium longifolium. Phragmapedium longifolium, seperti dengan Paphiopedilum delenatii, Paphiopedilum philippinense dan epifit Guarianthe bowringiana, bercambah dengan baik dalam kebanyakan medium. Empat daripada enam orkid epifit yang dikaji menunjukkan percambahan terbaik dalam medium Norstog. Empat daripada enam spesies orkid daratan/litofit menunjukkan percambahan terbaik dalam medium Knudson C + arang teraktif. Keputusan menunjukkan bahawa berbanding spesies orkid daratan yang lain, biji benih epifit lebih menggemari nitrogen dalam bentuk asid amino daripada nitrogen dalam bentuk ammonium atau garam nitrat.

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