Plant Cell, Tissue and Organ Culture (PCTOC)

, Volume 106, Issue 2, pp 299–307 | Cite as

Organogenesis and encapsulation of in vitro-derived propagules of Carrizo citrange [Citrus sinensis (L.) Osb. × Poncirius trifoliata (L.) Raf]

  • Maria Antonietta Germanà
  • Maurizio Micheli
  • Benedetta Chiancone
  • Laura Macaluso
  • Alvaro Standardi
Original Paper

Abstract

Due to widespread polyembryony, Citrus rootstocks are usually propagated by open-pollinated seed germination, although micropropagation offers many advantages. Encapsulation technology has recently attracted the interest of researchers in the field of plant propagation because it combines the advantages of zygotic or gamic seeds with those of micropropagation. In this study, we examined the encapsulation of Carrizo citrange uninodal microcuttings (3–4 mm long) and evaluated the influence of the calcium alginate coating, a short time storage at cold temperature, and different sowing substrates on the viability and regrowth of the explants. A secondary aim was to develop an efficient protocol to induce root formation in the microcuttings. The results showed that encapsulation did not negatively affect the viability, providing a satisfactory regrowth, and storage potential for 30 days at low temperature. No differences in viability and regrowth were detected between the two different sowing substrates tested (agar-solidified medium and paper filter). To optimize the production of microcuttings required to perform the encapsulation experiments, in a preliminary experiment we assessed different factors affecting the in vitro shoot regeneration from epicotyl segments (obtained from seeds of Carrizo citrange germinated in vitro), including the influence of in vitro organogenesis, explant orientation, cut surface contact with the medium, treatments with different growth regulators, and distance of the organogenic explants from the cotyledonary node. The highest organogenic response was obtained from segments horizontally cultured (particularly from the basal portion), from segments with the cut surface in contact with the medium and from explants cultured on medium supplemented with 6-benzyladenine. No significant difference in regeneration efficiency was found in response to the distance of the epicotyl portions from the cotyledonary node.

Keywords

Adventitious shoot Cytokinins Explant type Micropropagation Germplasm storage Synthetic seed 

Abbreviations

BA

6-benzyladenine

CSD

Cut surface down, in contact with the medium

CSU

Cut surface facing up

HP

Horizontal position

IBA

Indole-3-butyric acid

NAA

α-naphthaleneacetic acid

TDZ

Thidiazuron

VP

Vertical position

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Maria Antonietta Germanà
    • 1
  • Maurizio Micheli
    • 2
  • Benedetta Chiancone
    • 1
  • Laura Macaluso
    • 1
  • Alvaro Standardi
    • 2
  1. 1.Dipartimento DEMETRAUniversità degli Studi di PalermoPalermoItaly
  2. 2.Dipartimento di Scienze Agrarie e AmbientaliUniversità degli Studi di PerugiaPerugiaItaly

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