Siew-Hwa Kwa

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Apogamous sporophytes were produced on Platycerium coronarium gametophytes cultured in the presence of indole-3-acetic acid (IAA). The percentage of apogamy as well as the total number of apogamous sporophytes produced per gametophyte clump were highest in the presence of 40 μM IAA. When ethylene was allowed to accumulate in the culture vessel in the(More)
The effect of ethylene on in vitro plant regeneration from frond and rhizome expiants of Platycerium coronarium was investigated. Ethylene levels in the culture vessels increased with time, resulting in a decrease in the percentage of sporophytes produced. Addition of the ethylene action inhibitor silver thiosulfate resulted in an increase in the percentage(More)
Cell suspension cultures were initiated from gametophyte-derived callus of the fern Platycerium coronarium. Two distinct types of callus masses, distinguished by their colouration, were obtained when the cells from suspension culture were plated on semisolid Murashige and Skoog (MS) medium containing 10 μM kinetin. The two types of callus masses had(More)
The in vitro activities of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and phosphoenolpyruvate carboxylase (PEPC) were measured in cell-free extracts of Platycerium coronarium callus cultured for up to 42 days under photoautotrophic conditions with CO2 enrichment. With an increase in CO2 in the culture environment to 10% (v/v) at low light,(More)
Bericht über sechs Patienten mit angeborenem Fehlen der Regenbogenhaut (Aniridie). In der Weltliteratur wurden bisher etwa 500 Fälle beschrieben. Die Häufigkeit der Aniridie liegt zwischen 1∶64000 und 1∶100 000. Die Mißbildung beruht auf einer Entwicklungsstörung des Ektoderms, die zeitlich in die 11–12. Woche der Embryonalentwicklung datiert wird. Die(More)
The uptake of nitrate and ammonium by callus ofPlatycerium coronarium from the culture medium was examined. Nitrate reductase activity of photoautotrophic callus cultures under CO2 enrichment was significantly lower compared to the cultures without CO2 enrichment, but higher than that of heterotrophic callus cultured on medium with 2% (wt/vol) sucrose. When(More)
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