Abstract
Arising from a relatively isolated center of origin , papaya has spread throughout all tropical and subtropical countries through human intervention. This global dispersal has coincided with continuous improvement of the cultivated plants through breeding programs often designed to improve the agronomic characters and to address biotic and abiotic stresses that affect papaya production . Papaya production is threatened by a myriad of problems including devastating pests and diseases as well as the inability for both farmers and researchers alike to differentiate among the three sex types, male, female and hermaphrodite at the seedling stage, among others. Many attempts have been made by researchers over the years to resolve the problems through conventional and biotechnological techniques. Conventional plant breeding has given rise to varieties that are resistant to diseases as well as high yielders of quality fruits. However, conventional techniques require 12–14 years to develop new papaya varieties. Besides, devastating viral diseases like papaya ringspot virus (PRSV ) have proved almost impossible to control through conventional means. The innovative technologies and growing understanding to manipulate the papaya phenotype at the molecular level provide new opportunities for the improvement of papaya . Through gene transfer technology, it is possible to develop transgenic papaya with pest and disease resistance as well as improved nutritional quality . This chapter provides insight into conventional breeding of papaya , the role of tissue and protoplast culture as well as molecular techniques in papaya improvement such as genetic transformation , mutation breeding and marker assisted selection and breeding. In addition, the potential of parthenocarpy as well as polyploidy and somaclonal variation in papaya breeding are discussed.
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Acknowledgements
The authors thank the Jomo Kenyatta University of Agriculture and Technology (JKUAT), Research Production and Extension (RPE) Division for funding the papaya varietal development project from 2008 to 2014, the Regional Universities Forum for Capacity Building in Agriculture (RUFORUM) for funding papaya tissue culture project 2010–2012 and the Africa Union-African innovation-JKUAT and PAUSTI (Africa –ai-JAPAN) for funding agronomic evaluation of papaya varieties from 2015 to date.
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Appendices
Appendix 1: Research Institutes and Online Resources Relevant to Papaya Genetic Improvement Research
Country | Institution | Specialization | Research activities | Contact information |
---|---|---|---|---|
Australia | Griffith University | Teaching and Research institute | Biotechnology of the papaya | Prof. Dr. Roderick A. Drew Griffith Sciences, Logan Campus, Griffith University, Meadowbrook, QLD 4131 Australia Telephone: (61)733821291 Fax: (61)737357618 E-mail: r.drew@griffith.edu.au |
Brazil | Capixaba Institute for Research , Technical Assistance and Rural Extension (INCAPER) | Research , technical assistance and rural extension | Germplasm selection and improvement | Eng Agr, D. Sc., Luiz Augusto Lopes Serrano INCAPER/CRDR Nordeste, C. P. 62, 29900-970, Linhares-ES. E-mail: lalserrano@incaper.es.gov |
India | Indian Agricultural Research Institute Regional Station, Pusa, Bihar, India | Research institute | Breeding papaya varieties of uniform, high yielding with better quality for wider adaptability | Dr. Tapas Ranjan Das Phone: 06274-240232 Fax: 06274-240236 E-mail: head_bihar@iari.res.in |
Indonesia | Indonesian Tropical Fruit Research Institute (ITFRI) | Research institute | Breeding and biotechnology | Jl. Raya Solok, Aripan Km. 8, PO Box. 5, Solok 27301, West Sumatra Phone: 0755-20137 Fax: 0755-20592 Email: rif@padang.wasantara.net.id; balitbu@litbang.pertanian.go.id |
Kenya | Jomo Kenyatta University of Agriculture and Technology | Teaching and Research institute | Varietal Development and Evaluation | Dr. Fredah K. Rimberia, P.O. Box 62000-00200 Nairobi Kenya Phone: +254726856304 Email: frenda@agr.jkuat.ac.ke or fredawanza@yahoo.com |
Malaysia | Felda Agricultural Services Sdn Bhd | Commercial Agribusiness firm | Agricultural extension and Disease management in Papaya | Menara Felda, Platinum Park, Persiaran KLCC, Kuala Lumpur, Malaysia 50088 +60 3-2859 0366 Email: feldabiotech@felda.net.my |
Nigeria | The National Horticultural Research institute | Research institutes | Papaya Varietal development and evaluation | Ms. Olubunmi Ibitoye National Horticultural Research Institute, P. M. B. 5432 Jericho Reservation Area, IDI-ISHIN, Oyo, Ibadan, Nigeria Telephone: (234)8023629104 E-mail bunmiajisafe@yahoo.com |
Philippines | Institute of Plant Breeding , College of Agriculture and Food Science, University of the Philippines, Los Baños | Research institute | National biotechnology research center and repository for all crops | Office of the director, 4031 College, Laguna, Philippines Telephone: (049) 536-5287; (049) 543-9571 Email: ipb.uplb@up.edu.ph |
South Africa | Neofresh (Pty) Ltd. | Commercial fruit growers and exporters | Selection , hybridization and production of high quality papaya fruit for supermarkets and export outlets | Dr Aart Louw (Chief Researcher and Plant Breeder) PO Box 201 Sonpark 1206 Mpumalanga RSA T +27 13 590 0947 adminmanager@neofresh.net www.neofresh.net |
Thailand | East West Seed Company | Commercial Seed company | Breeding | Lamai Yapanan Business Development Manager, 7 Moo 8, Chiang Mai Praw Road, 50290, Chiang mai, Thailand Email: lamai.yapanan@eastwestseed.com |
United States of America-Hawaii | Hawaii Agricultural Research Centre (HARC) | Research Centre | Tissue culture and transformation of papaya | 94-340 Kunia Rd, Waipahu, HI 96797, USA Phone:+1 808-677-5541 |
United States of America-Hawaii | University of Hawaii | Papaya breeding | Dr. Dennis Gonsalves 789 Hoolaulea Street, Hilo Hawaii 96720 USA E-mail dennisgonsal@gmail.com |
Appendix 2: Genetic Resources
Country | Cultivar | Sex type | Flesh color |
---|---|---|---|
Australia | Improved Petersen | Dioecious | Yellow |
Guinea Gold | Hermaphrodite | Yellow | |
Sunnybank/S7 | Dioecious | Yellow | |
Richter/Arline | Dioecious | Yellow | |
America – Mexico | Verde | – | – |
Gialla | – | – | |
Cera | – | – | |
Chincona | – | – | |
USA – Florida | Cariflora | Dioecious | Yellow |
Betty | Dioecious | Yellow | |
Homestead | Dioecious | Yellow | |
USA – Hawaii | Kapoho Solo | Hermaphrodite | Yellow |
Sunrise | Hermaphrodite | Red | |
Waimanalo | Hermaphrodite | Yellow | |
Rainbow | Hermaphrodite | Yellow | |
Venezuela | Paraguanera | – | – |
Roja | – | Red | |
Caribbean – Barbados | Wakefield | – | – |
Graeme 5, and 7 | – | – | |
Cuba | Maradol | Hermaphrodite | Red |
Trinidad | Santa Cruz Giant | – | – |
Cedro | – | – | |
Dominican Republic | Cartagena | Hermaphrodite | Yellow |
Asia – India | Coorg Honey Dew | Hermaphrodite | Yellow |
Coimbitor 2 | Dioecious | Yellow | |
Indonesia | Semangka | Hermaphrodite | Red |
Dampit | Hermaphrodite | Red | |
Malaysia | Eksotika | Hermaphrodite | Red |
Sekaki | Hermaphrodite | Red | |
Philippines | Cavite/Sinta | Hermaphrodite | Red |
Taiwan | Tainung No. 5 | Hermaphrodite | Red |
Thailand | Sai-nampueng | Hermaphrodite | Red |
Khaek Dam | Hermaphrodite | Red | |
South Africa | Hortus Gold | Dioecious | Yellow |
Kaapmuiden | – | Yellow | |
Honey Gold | Dioecious | Yellow |
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Rimberia, F.K., Ombwara, F.K., Mumo, N.N., Ateka, E.M. (2018). Genetic Improvement of Papaya (Carica papaya L.). In: Al-Khayri, J., Jain, S., Johnson, D. (eds) Advances in Plant Breeding Strategies: Fruits. Springer, Cham. https://doi.org/10.1007/978-3-319-91944-7_21
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