In vitro flowering ofDendrobium candidum

Area of Science:

• Plant Science
• Horticulture
• Biotechnology

Background:

• Dendrobium candidum, a valuable Chinese wild orchid, typically takes 3-4 years to flower.
• Accelerating flowering is crucial for commercial propagation and research.

Purpose of the Study:

• To investigate the effects of plant hormones and polyamines on inducing precocious flowering in Dendrobium candidum tissue culture.
• To optimize conditions for rapid flower initiation in this orchid species.

Main Methods:

• Tissue culture techniques were employed using protocorms, shoots, and plantlets.
• Various plant hormones including spermidine, benzyladenine (BA), 1-naphthaleneacetic acid (NAA), and abscisic acid (ABA) were tested in culture media.
• Protocorms were pre-treated with ABA before transfer to BA-containing media.

Main Results:

• Spermidine, BA, or NAA + BA in the medium induced flowering in 3-6 months at 31.6%-45.8% frequency.
• Pre-treatment with ABA followed by BA significantly increased average flowering frequency to 82.8%.
• Successful induction depended on the developmental stage and inhibition of meristem (mt) formation.

Conclusions:

• Plant hormones and polyamines can effectively induce precocious flowering in Dendrobium candidum.
• ABA pre-treatment followed by BA is a highly effective strategy for accelerating orchid flowering.
• This method offers a significant advancement for the cultivation and propagation of Dendrobium candidum.