Progress in Breeding of F1 Papaya Hybrids in Malaysia

Chan, Y.K.

doi:10.17660/actahortic.1992.292.5

Cited by 9 publications

(9 citation statements)

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“…In a number of plants, inbreeding has been shown to have severe negative effects on desirable traits (Cornelius and Dudley 1974;Damgaard and Loeschcke 1994;Huang et al 1995). However, papaya lines can be obtained and maintained without inbreeding depression (Chan 1992;Dinesh et al 1992). The finding that increased inbreeding did not disrupt developmental stability is consistent with our own field observation attempts to link developmental stability with homozygosity.…”

Section: Discussionsupporting

confidence: 85%

“…According to Chan (1992), the productivity of hybrids will eventually surpass that of the parental lines by 199.6%, thereby representing an excellent alternative for commercial purposes. Hybrid production of papaya is possible due to the absence of inbreeding depression in the species and to its floral biology, which comprises dioecious and hermaphrodite plants (Manshardt and Drew 1998).…”

Section: Introductionmentioning

confidence: 99%

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Polymorphic microsatellite marker set for Carica papaya L. and its use in molecular-assisted selection

et al. 2010

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Conventional methods for the selection of papaya pure lines are time-consuming. Procedures involving the use of molecular markers and the indirect selection of homozygous plants can reduce this time considerably. The objective of this study was to evaluate the informativeness of a microsatellite marker set when used in marker-assisted selection (MAS) for the development of new papaya lines. Eighty-three lines originating from two segregating F 3 populations and from papaya germplasm were used for the molecular analysis of 27 microsatellite primers. Twenty polymorphic microsatellite primers were identified, allowing the identification of 86 alleles, with an average of 3.18 alleles per primer. The observed heterozygosity values were low for both the markers (0.00-0.29) and the individual lines (0.00-0.35). The inbreeding coefficient (f) ranged from 0.634 to 1.00. Eleven lines with f = 1.00 and 18 lines with f varying from 0.953 to 0.961 were identified. In addition, papaya lines showed high genetic diversity, which will certainly contribute to the development of new varieties. Our results show that the use of microsatellites in MAS is a quick and effective procedure for the development of papaya lines.

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Section: Discussionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Polymorphic microsatellite marker set for Carica papaya L. and its use in molecular-assisted selection

et al. 2010

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“…com.). In Malaysia, hybridisation of Eksotika Line 20 with its sib-line produced the F 1 hybrid Eksotika II, which has heterosis in vigor and yield (Chan, 1992). In Hawaii, the transgenic cultivar Rainbow was derived as the F 1 progeny of gynodioecious parental lines SunUp (transgenic) and Kapoho (a popular nontransgenic).…”

Section: Varietal Selection: Inbred Lines and Hybrid Cultivarsmentioning

confidence: 99%

Section 7 - Bread Wheat (TRITICUM AESTIVUM)

2006

Harmonisation of Regulatory Oversight in Biotechnology

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The OECD is a unique forum where the governments of 30 democracies work together to address the economic, social and environmental challenges of globalisation. The OECD is also at the forefront of efforts to understand and to help governments respond to new developments and concerns, such as corporate governance, the information economy and the challenges of an ageing population. The Organisation provides a setting where governments can compare policy experiences, seek answers to common problems, identify good practice and work to co-ordinate domestic and international policies.The OECD member countries are: Australia, Austria, Belgium, Canada, the Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Japan, Korea, Luxembourg, Mexico, the Netherlands, New Zealand, Norway, Poland, Portugal, the Slovak Republic, Spain, Sweden, Switzerland, Turkey, the United Kingdom and the United States. The Commission of the European Communities takes part in the work of the OECD.OECD Publishing disseminates widely the results of the Organisation's statistics gathering and research on economic, social and environmental issues, as well as the conventions, guidelines and standards agreed by its members. © OECD 2006 No reproduction, copy, transmission or translation of this publication may be made without written permission. Applications should be sent to OECD Publishing: rights@oecd.org or by fax (33 1) 45 24 13 91. Permission to photocopy a portion of this work should be addressed to the Centre français d'exploitation du droit de copie, 20, rue des Grands-Augustins, 75006 Paris, France (contact@cfcopies.com). This book is published on the responsibility of the Working Group on Harmonisation of Regulatory Oversight in Biotechnology, which is a subsidiary group of the Chemicals Committee and Working Party on Chemicals, Pesticide and Biotechnology of the OECD. Foreword 3 FOREWORDGenetically engineered crops (also known as transgenic crops) such as maize, soybean, rapeseed and cotton have been approved for commercial use in an increasing number of countries. During the period from 1996 to 2005, for example, there was more than fifty-fold increase in the area grown with transgenic crops worldwide, reaching 90 million hectares in 2005.1 Such approvals usually follow a science-based risk/safety assessment.The environmental safety/risks of transgenic organisms are normally based on the information on the characteristics of the host organism, the introduced traits, the environment into which the organism is introduced, the interaction between these, and the intended application. The OECD's Working Group on Harmonisation of Regulatory Oversight in Biotechnology decided at its first session, in June 1995, to focus its work on identifying parts of this information, which could be commonly used in countries for environmental safety/risk assessment to encourage information sharing and prevent duplication of effort among countries. Biosafety Consensus Documents are one of the major outputs of its work.B...

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“…Erkek papaya ağaçlarında bulunan çiçeklerin erkek organları fonksiyonel olduğundan tozlanmayı sağlar. Yapışkan kümeler halinde üretilen çiçek tozu, böcekler tarafından dişi çiçeklere taşınır (Chan, 1995). Dişi papaya ağaçları, kısa sapları üzerinde her biri tamamen gelişmiş bir pistile sahip dişi çiçekleri taşır.…”

Section: Introductionunclassified

Somali Koşullarında Yetiştirilen Farklı Papaya Çeşitlerinin Fenolojik Özellikleri ve Verim Performansları

AHMED,

ENGİN

2023

ÇOMÜ Ziraat Fakültesi Dergisi

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Çalışma, 2019-2020 arasında Somali’nin Shabelle bölgesindeki Afgoye şehrinden 10 km uzakta açık alanda yürütülmüştür. Araştırmada, Somali koşullarında farklı papaya çeşitlerinin fenolojik özelikleri ve verim açısından gösterdikleri performansları belirleyerek, üreticiye uygun çeşit önermek amaçlanmıştır. Denemede materyal olarak dişi ve erkek ağaç oranının dengelenmesine ihtiyaç duymaksızın, üreticilerin yetiştirebilecekleri, ihracatta tercih edilen ve hermafrodit çeşit olan ‘Eksotika II’ ve yerel bir çeşit olan ‘Somali Papaya’ kullanılmıştır. Hermafrodit çeşit ‘Eksotika II’ Malezya Tarımsal Araştırma ve Geliştirme Enstitüsü’den (MARDI) temin edilmiştir. ‘Eksotika II’ ve ‘Somali Papaya’ tohumları maxpeat torf içeren 7x9’luk viyollerde çimlendirilerek gelişmeleri sağlanmıştır. Boyları 50 cm’e ulaşan papaya fidanları 3x3 metre olacak şekilde bahçeye dikilerek yetiştirilmiştir. ‘Eksotika II’ papaya ağaçları ve ‘Somali Papaya’ yerel çeşidinin dişi ağaçlarında ağaç yüksekliği (cm), gövde kalınlığı (cm), ağaç başına yaprak sayısı (adet), dikimden ilk çiçeklenmeye kadar geçen süre (gün), çiçeklenmeden hasada kadar geçen süre (gün), ağaç başına meyve ağırlığı (kg) ve meyve tutumu (adet/ağaç), değerleri araştırılmıştır. İn vivo ortamda, ‘Eksotika II’ ve ‘Somali Papaya’ çeşidinin tohumları 15 gün içerisinde çeşide bağlı olarak % 58 (Eksotika II) ile % 67 (Somali Papaya) arasında çimlenme göstermişlerdir. Ağaç yüksekliği, dikimden ilk çiçeklenmeye kadar geçen süre, çiçeklenmeden hasada kadar geçen süre, ağaç başına meyve ağırlığı ve meyve tutumu değerleri ‘Eksotika II’ ve ‘Somali Papaya’ çeşidinin dişi ağaçlarında birbirine benzer sonuçlar vermiştir. Gövde kalınlığı ve ağaç başına yaprak sayısı bakımından ‘Eksotika II’ çeşidi yerel çeşide göre daha yüksek değerlere sahiptir. Ağaç başına meyve ağırlığı en yüksek çeşit 41.17 kg ile ‘Eksotika II’ papaya’ çeşididir. ‘Somali Papaya’ yerel çeşidi (dioik) papaya ağaçlarından verim alınabilmesi için gerekli olan dişi ve erkek ağaç oranı yaklaşık 93 gün (dikimden ilk çiçeklenmeye kadar geçen süre) sonra belirlenebilmektedir. Çiçek yapılarına göre dişi veya erkek olduğu belirlenen ağaçlar arasından dişi ağaçlar ile verimsiz erkek ağaçların %25’ini bırakılarak diğerlerinin teklendiği ‘Somali Papaya’ sı gibi dioik çeşitlerin yerine, ‘Eksotika II’ çeşidi papaya yetiştiricilere önerilmektedir.

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Progress in Breeding of F1 Papaya Hybrids in Malaysia

Cited by 9 publications

References 0 publications

Polymorphic microsatellite marker set for Carica papaya L. and its use in molecular-assisted selection

Polymorphic microsatellite marker set for Carica papaya L. and its use in molecular-assisted selection

Section 7 - Bread Wheat (TRITICUM AESTIVUM)

Somali Koşullarında Yetiştirilen Farklı Papaya Çeşitlerinin Fenolojik Özellikleri ve Verim Performansları

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