Development of ex vitro Rhynchostylis plantlets in cutting ball containing different concentrations of naphthaleneacetic acid

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Dang Cong Du
Siripun Sarin
Dang Van Dong
Aphichat Chidburee


          The study was aimed to evaluate the effects of various concentrations of naphthaleneacetic acid (NAA) in encapsulated alginate as a cutting ball on ex vitro development of Rhynchostylis gigantea plantlets. NAA concentrations in a cutting ball caused particular effects on development of roots and leaves of R. gigantea plantlets. There was the changing of root diameter coincidentally followed by the altering of the rate of root initiation and average number of originated roots among treatments. The optimum time to carry ex vitro R. gigantea plantlets was 4 weeks. The NAA concentrations ranging from 1 to 2 ppm promoted better root development of ex vitro R. gigantea plantlets than other treatments. NAA concentration at 1 ppm gave the highest rate of leaf initiation, but it showed the lowest content of chlorophyll.


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