Development of PRSV-P resistant Carica papaya genotypes by introgression of genes from wild Vasconcella species

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Title Development of PRSV-P resistant Carica papaya genotypes by introgression of genes from wild Vasconcella species
Author Drew, Roderick Alastair; Siar, S.V.; O'Brien, Dominique Sara; Sajise, A.G.C.
Journal Name Acta Horticulturae
Editor R.A. Drew
Year Published 2005
Place of publication Leuven, Belgium
Publisher ISHS
Abstract This paper reports successful collaboration between researchers in the Philippines and Australia since 1993 on a project funded by ACIAR. Three intergeneric crosses were done between C. papaya and Vasconcella spp. resistant to Papaya Ring¬spot Virus (PRSV-P). Production of F1 plants required embryo rescue and regeneration after an embryogenic phase in vitro. Eleven F1 plants from a cross between C. papaya and V. quercifolia were selected as being PRSV-P resistant and having some fertility, and 4 of these had sufficient fertility to produce embryos when backcrossed to papayas. Cytogenetic studies on one of these intergeneric hybrids revealed variable chromosome counts, presence of univalents, laggards and meiotic aberrations and pollen fertility of 0.2 – 2.2%. Segregating populations of first and second backcross plants were evaluated for PRSV-P resistance, fertility and morphological characteristics including fruit shape, size and quality. All first backcross plants were micropropagated in vitro before glasshouse and field evaluation. Variable reactions to the two viral strains in the two countries were observed. One plant (clone 54) demonstrated a high level of tolerance against multiple inoculations of PRSV-P in the glasshouse and stood up against aphid transmitted PRSV-P in the field for 9 months in Australia, however showed little resistance to PRSV-P in the Philippines. Results indicate that 3 backcrosses may be sufficient to produce fruit that are similar to papaya and commercially acceptable.
Peer Reviewed Yes
Published Yes
Volume 694
Page from 73
Page to 77
ISSN 0567-7572
Date Accessioned 2006-03-17
Date Available 2009-12-18T06:31:13Z
Language en_AU
Faculty Faculty of Science
Subject PRE2009-Plant Protection (Pests, Diseases and Weeds)
URI http://hdl.handle.net/10072/8746
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1a

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