biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 62:439-450, 2018 | DOI: 10.1007/s10535-018-0769-4

Somatic embryogenesis from stem thin cell layers of Dendrobium aqueum

S. Parthibhan1, M. Venkateswara Rao1,*, J. A. Teixeira da Silva2, T. Senthil Kumar1
1 Department of Botany, Bharathidasan University, Tiruchirappalli, India
2 Miki-cho Post Office, Ikenobe, Kagawa, Japan

An efficient in vitro regeneration protocol through somatic embryogenesis was established from stem transverse thin cell layers (tTCLs) of Dendrobium aqueum Lindley, an imperiled orchid. This study outlines the induction and successive maturation stages of D. aqueum somatic embryos (SEs). The tTCLs (~ 0.5 mm thick) cultured on halfstrength Murashige and Skoog (MS) medium containing cytokinins and auxins, either individually or in combination, produced embryogenic callus (EC). Treatment with 0.5 mg dm-3 zeatin induced EC in 41.42 % of tTCLs. As many as 42.66 globular SEs per tTCL were formed in the presence of 1.5 mg dm-3N6-(2-isopentyl) adenine (2iP) but only on 10.33 % of explants. The combined treatment of 2iP (1.5 mg dm-3) and 0.5 mg dm-3 6-benzyladenine resulted in 34 globular SEs on 14.7 % of tTCLs whereas the combination of 2iP and 1.0 mg dm-3 indole-3-butyric acid (IBA) induced 7.4 globular SEs on 52.33 % of tTCLs. Supplementation of activated charcoal, amino acids, and antioxidants alleviated browning at all the concentrations tested, but the EC response declined. The addition of 0.5 mg dm-3 polyvinylpyrrolidone to 1.5 mg dm-3 2iP and 1.0 mg dm-3 IBA produced 24 SEs on 19.89 % of tTCLs suggesting that the EC and SEs can be effectively induced by individual cytokinins whereas the synergistic treatments with other compounds can only enhance the induction of EC. Histological observations of EC showed the formation of globular SEs from sub-epidermal regions. Successive developmental stages of globular SEs and the intermediate stage of protocorm like bodies until the formation of plantlets were observed. The plantlets obtained through SEs showed no morphological variations, and inter simple sequence repeat profiles also confirmed the genetic fidelity of in vitro-derived progeny with high monomorphism (97.78 %). In conclusion, the use of stem tTCLs is an effective method to produce SEs through indirect somatic embryogenesis in D. aqueum.

Keywords: auxins; cytokinins; epiphyte; embryogenic callus; in vitro culture; ISSR; protocorm like bodies
Subjects: somatic embryogenesis; stem thin cell layers; auxins; cytokinins; ISSR; procorm like bodies

Received: June 13, 2017; Revised: November 22, 2017; Accepted: December 4, 2017; Published: September 1, 2018  Show citation

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Parthibhan, S., Venkateswara Rao, M., da Silva, J.A.T., & Senthil Kumar, T. (2018). Somatic embryogenesis from stem thin cell layers of Dendrobium aqueum. Biologia plantarum, 62(3), 439-450. doi: 10.1007/s10535-018-0769-4
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