African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12278

Full Length Research Paper

Efficient micropropagation of Citrus sinensis (L.) Osbeck from cotyledonary explants suitable for the development of commercial variety

Aseesh Pandey
  • Aseesh Pandey
  • G.B. Pant Institute of Himalayan Environment and Development, Kosi-Katarmal, Almora, Uttarakhand, India.
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Sushma Tamta
  • Sushma Tamta
  • Plant Tissue Culture Laboratory, Department of Botany, D.S.B. Campus, Kumaun University, Nainital, 263002, Uttarakhand, India.
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  •  Received: 18 September 2015
  •  Accepted: 30 October 2015
  •  Published: 24 August 2016

Abstract

In vitro regeneration of sweet orange (Citrus sinensis (L.) Osbeck Family: Rutaceae) has been performed via direct and indirect organogenesis. For indirect organogenesis, callus was induced and proliferated from leaf explants derived from in vitro grown seedlings on Murashige and Skoog (MS) media containing 2,4-dichlorophenoxyacetic acid (2,4-D) alone or in combination with benzyl adenine (BA) and α-naphthalene acetic acid (NAA). For direct organogenesis, explants were placed on MS media containing BA alone or in combination of NAA and gibberellic acid (GA3). Well-developed microshoots were treated with different concentrations of NAA for rhizogenesis (a two-step procedure). Different responses to these treatments were recorded depending upon the procedure used. It appears that 4.53 μM 2,4-D in combination with 5.37 μM NAA induced 93.33% callus and proliferate 86.67% of callus into 6.93 shoots per explant. Exogenous addition of 4.44 μM BA in combination with 1.54 μM GA3 enhanced shoot multiplication rate significantly (17.73±1.69 shoots/explant) in comparison to control (0.00±0.00 shoots/explant). Microshoots were rooted best (75.00±14.43%) under the treatment 100μM NAA for 48 hrs. and rooted plantlets were transferred to soil, following acclimatization were taken to maturity in the polyhouse.

Key words: Malta, Himalaya, benzyl adenine (BA), callus.

Abbreviation

MS, Murashige and Skoog media; 2,4-D, 2,4-dichlorophenoxyacetic acid; BA, benzyl adenine; NAA, α-naphthalene acetic acid.