Biologia plantarum 53:395-399, 2009 | DOI: 10.1007/s10535-009-0075-2
In vitro organogenesis of Citrus volkameriana and Citrus aurantium
- 1 Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP, Brazil
- 2 Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Piracicaba SP, Brazil
In vitro organogenesis of Citrus volkameriana and C. aurantium was studied considering three explant types: epicotyl segment, internodal segment, and hypocotyl segment with attached cotyledon fragment. The explants were cultured in medium according to Grosser and Gmitter (EME) supplemented with 0, 0.5, 1.0, 1.5, and 2.0 mg dm- 3 6-benzyl-aminopurine (BAP), incubated firstly in darkness for 4 weeks, and then transferred to 16-h photoperiod for 2 weeks. Comparing epicotyl and internodal segments, a higher percentage of responsive explants and a higher number of shoots per explant were obtained with epicotyl segments, regardless of the BAP concentration. For C. volkameriana the highest percentage of responsive epicotyl segments (42 %) was obtained in EME with 1.0 mg dm-3 BAP, while for C. aurantium (59 %) in EME with 0.5 mg dm-3 BAP. The organogenesis efficiency was the best with the use of the hypocotyl segment with attached cotyledon fragment (77 % for C. volkameriana and to 75 % for C. aurantium). With this explant the morphogenesis occurred only in the hypocotyl region. The in vitro organogenesis was characterized by histological analyses showing that the morphogenic process started in the cambium region near the explant cut end.
Keywords: adventitious bud; BAP; epicotyl; hypocotyl; internodal segment; sour orange; volkamer lemon
Subjects: auxins; Citrus aurantium; Citrus volkamericana; cytokinins; in vitro culture, direct regeneration
Received: August 16, 2008; Accepted: April 15, 2009; Published: June 1, 2009 Show citation
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