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Title: Early in vitro flowering and seed production in culture in Dendrobium Chao Praya Smile (Orchidaceae)
Authors: Hee, K.H.
Loh, C.S. 
Yeoh, H.H. 
Keywords: Dendrobium Chao Praya Smile
In vitro flowering
Pollen germination
Seed production in culture
Sporad analysis
Issue Date: Dec-2007
Citation: Hee, K.H., Loh, C.S., Yeoh, H.H. (2007-12). Early in vitro flowering and seed production in culture in Dendrobium Chao Praya Smile (Orchidaceae). Plant Cell Reports 26 (12) : 2055-2062. ScholarBank@NUS Repository.
Abstract: Plantlets of Dendrobium Chao Praya Smile maintained in vitro were induced to flower, which produced viable seeds within about 11 months. A two-layer (Gelrite-solidified layer topped with a layer of liquid medium of the same volume and composition) culture system containing benzyladenine (BA) at 11.1 μM induced the highest percent of flowering (45%) in plantlets within 6 months from germination. The percentage of inflorescence induction was increased to 72% by pre-selecting morphologically normal seedlings prior to two-layer culture. Plantlets in culture produced both complete (developmentally normal but smaller than flowers of field grown plants) and incomplete flowers. Pollen and female reproductive organs of in vitro-developed complete flowers were morphologically and anatomically similar to flowers of field grown plants. In addition, 65% of the pollen grains derived from in vitro-developed flower were tetrad suggesting that regular meiosis occurred during microsporogenesis. The percentage of germination of pollen grains derived from in vitro-developed flowers and flowers of field grown plants, incubated on modified Knops' medium for 8 days, were 18.2 and 52.8%, respectively. Despite a lower percentage of germination of the pollen grains derived from in vitro-developed flowers, flowers induced in culture could be self-pollinated and developed seedpods with viable seeds. Nearly 90% of these seeds developed into protocorms on germination in vitro. These seedlings were grown in culture and induced to flower in vitro again using the same procedure. © 2007 Springer-Verlag.
Source Title: Plant Cell Reports
ISSN: 07217714
DOI: 10.1007/s00299-007-0421-9
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