Spathoglottis Plicata Research Articles

Induced DNA synthesis in orchid mycorrhiza

The distribution of DNA values in the cortex of mycorrhizal and non-mycorrhizal roots of Dactylorhiza purpurella and Spathoglottis plicata has been studied by Feulgen microdensitometry. Endoreduplication occurs during differentiation of cortical parenchyma. Nuclei with two or four times the normal DNA content are present in infected and adjacent uninfected cells. Autoradiography following (3)H-thymidine incorporation showed that DNA synthesis is induced in fully differentiated cortical cells of S. plicata during infection by Tulasnella calospora.

In vitro Mass Clonal Propagation of Spathoglottis plicata Blume

For in vitro clonal propagation of Spathoglottis plicata Blume nodal segments of young shoots were cultured on half strength of MS with 2% sucrose + 2.0 mg/l BA + 0.5 mg/l NAA + 2 g/l peptone + 15% (v/v) CW + 0.5 g/l AC, incubated at 24 ± 2ºC under 3000 lux fluorescent light for a 16 hr photoperiod per day. About 19 micro-shoots were induced from the explants within 12 weeks. Subculture of micro-shoots for eight weeks on the same nutrient medium enhanced the number of micro-shoots up to 60. The clumps of the micro-shoots were dissected and cultured on half strength of MS with 2% sucrose + 2 g/l peptone + 15% (v/v) CW + 0.5 g/l AC + 200 mg/l L-glutamine. The micro-shoot sections elongated to form shoots, and new micro shoots were induced from the base within eight weeks of culture. For plantlet formation the best rooting medium was determined as half strength of MS with 2% sucrose + 2 g/l peptone + 15% (v/v) CW + 0.5 g/l AC + 50 g/l banana pulp. After rearing 25 g mixture of urea, TSP and MOP (2 : 1 : 1) were applied per plant at three months intervals. All the regenerated plants blossomed on the third year. Key words: Spathoglottis plicata, Clonal propagation, Acclimation D.O.I. 10.3329/ptcb.v19i2.5432 Plant Tissue Cult. & Biotech. 19(2): 151-160, 2009 (December)

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