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Protocols for Micropropagation of Woody Trees and Fruits

Protocols for Micropropagation of Woody Trees and Fruits

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MICROPROPAGATION OF PAPAYA 441<br />

net <strong>and</strong> misting. Once plant develops 4–6 fully opened leaves, transfer them into<br />

poly bags filled with Soil + S<strong>and</strong> + Farm Yard Manure (1:1:1) (Figure 2).<br />

2.3.4. Somatic Embryogenesis from Hypocotyls<br />

Select 10-day-old in vitro grown seedling. Cut the hypocotyl sections <strong>and</strong> inoculate<br />

them on half strength MS (Induction) medium. Incubate the cultures in the darkness<br />

<strong>for</strong> 4 weeks at 25°C ± 2°C <strong>for</strong> callus induction <strong>and</strong> subsequently somatic embryo<br />

<strong>for</strong>mation. For embryo proliferation, germination, rooting <strong>and</strong> acclimatization follow<br />

the above mentioned protocol (2.3.1 to 2.3.3).<br />

3. CONCLUSION<br />

Papaya is an important cash fruit crop owing to its fast maturation rate <strong>and</strong> continuous<br />

fruit production in subtropical <strong>and</strong> tropical climates. There are reports on<br />

micropropagation <strong>of</strong> papaya from mature field grown trees. However, the technique<br />

could not be reproduced <strong>for</strong> mass cloning <strong>of</strong> papaya at commercial scale. Latex<br />

oozing, in borne contamination, <strong>and</strong> poor in vitro rhizogenesis are some <strong>of</strong> the<br />

bottlenecks in micropropagation <strong>of</strong> papaya.<br />

4. REFERENCES<br />

Ali, A.M. & Hogan, L. (1976) Tissue culture <strong>of</strong> Carica papaya. Hort. Sci. 11, 27.<br />

Arora, I.K. & Singh, R.N. (1978) In vitro plant regeneration in Papaya. Curr. Sci. 47, 839–883.<br />

Drew, R.A. (1988) Rapid clonal propagation <strong>of</strong> papaya in vitro from mature field grown <strong>Trees</strong>. Hort Sci.<br />

23, 609–611.<br />

Drew, R.A. (1992) Improved techniques <strong>for</strong> in vitro propagation <strong>and</strong> germplasm storage <strong>of</strong> papaya. Hort<br />

Sci. 27, 1122–1124.<br />

Fitch, M.M. (1993) High frequency somatic embryogenesis <strong>and</strong> plant regeneration from Papaya<br />

hypocotyl callus. Plant Cell Tiss. Org. Cult. 32, 205–212.<br />

Fitch, M.M. & Manshardt, R.M. (1990) Somatic embryogenesis <strong>and</strong> plant regeneration from immature<br />

zygotic embryos <strong>of</strong> Papaya (Carica papaya). Plant Cell Rep. 9, 320–324.<br />

Litz, R.E. & Conover, R.A. (1978) Tissue culture propagation <strong>of</strong> Papaya. Proc. Fla. State Hort. Soc. 90,<br />

245–246.<br />

Litz, R.E., O ’ ’ Hair, S.K. & Conover, R.A. 1983. In vitro growth <strong>of</strong> Carica papaya L cotyledons. Sci.<br />

Hort. 19: 287–293.<br />

Murashige, T. & Skoog, F. (1962) A revised medium <strong>for</strong> rapid growth <strong>and</strong> bioassays with tobacco tissue<br />

cultures. Physiol Plant 15, 473–497.<br />

Rajeevan, M.S. & P<strong>and</strong>ey, R.M. (1986) Lateral bud culture (Carica papaya) <strong>for</strong> clonal propagation. Plant<br />

Tiss. Org. Cult. 6, 181–188.<br />

Sampson, J.A. (1986) Tropical <strong>Fruits</strong>. Second Ed. Longman Scientific <strong>and</strong> Technical, Longman Inc., New<br />

York, NY.<br />

Van Droogenbroeck, B., Kyndt, T., Martens, I., Romeijn-Peeters, E., Scheldeman, X., Romero-Motochi,<br />

J.P., Van Dammep, G.P. & Gheysen, G. (2003) Phylogenetic analysis <strong>of</strong> the highl<strong>and</strong>s papayas<br />

(Vasconcellea) <strong>and</strong> allied genera (Caricaceae) using PCR-RFLP. Theor. Appl. Genet. 108, 1473–1486.

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