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Title of Journal: Plant Cell Tiss Organ Cult

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Abbravation: Plant Cell, Tissue and Organ Culture

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Springer Netherlands

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DOI

10.1016/0361-9230(93)90093-Q

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1573-5044

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Recovering polyploid papaya in vitro regenerants a

Authors: Wellington Ronildo Clarindo Carlos Roberto de Carvalho Fernanda Santos Araújo Isabella Santiago de Abreu Wagner Campos Otoni
Publish Date: 2007/12/06
Volume: 92, Issue: 2, Pages: 207-214
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Abstract

Several protocols have been proposed for in vitro propagation of papaya either based on somatic embryogenesis or shoot organogenesis It is wellknown that tissue culturebased approaches are frequently associated with somaclonal variation Whether on the one hand this phenomenon can preclude further stages of in vitro culture on the other hand it can generate useful genetic variability for crop improvement However somaclonal variation analyses are limited in papaya tissue culture The DNA ploidy level of 250 papaya somatic embryogenesisderived plantlets from immature zygotic embryos was analyzed by flow cytometry In vitrogrown and greenhouse seedderived plantlets were used as diploid standards Flow cytometry unambiguously evidenced euploid diploid mixoploid triploid and tetraploid and aneuploid papaya plantlets indicating that in vitro culture conditions can lead the occurrence of somaclonal variation Additionally the two subsequent flow cytometry analyses showed that the DNA ploidy level remained stable in all cloned papaya plantlets during the successive subcultures in the multiplication mediumThe authors are grateful to Conselho Nacional de Desenvolvimento Científico e Tecnológico CNPq Brasília DF Brazil and Caliman Agrícola SA Linhares ES Brazil for financial support and Prof Marcio GC Costa for critical reading this manuscript

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