Papaya breeding in the 90's Malaysia

Chan Ying Kwok, . (1993) Papaya breeding in the 90's Malaysia. [Proceedings Paper]

Papaya breeding in MARDI was started in 1972 and one of the major achievements in the programme was the development of the Eksotika variety released in 1987. It was high yielding had very good eating qualities and was widely accepted as an export fruit. However it also has several weaknesses. Further improvement of the Eksotika was achieved through hybridization with its sib line Line 19. The new F1 hybrid Line 19 x Eksotika was tolerant to fruit freckles had better fruit cosmetics and storage life and its yield was also 10-15 percent higher. Following the success of this F1 hybrid which showed hybrid vigour or heterosis even from a narrow cross the emphasis for research in the 90's will be the development of other F1 varieties using wide crosses and exploitation of hybrid vigour. The work so far has been in the determination of the compatibility of crosses between 6 selected inbreds developed at MARDI and the production of these hybrid seeds. Breeding for disease resistance is another area that will be extremely important in the 90's. This is particularly true for papaya ringspot virus PRV and Cladosporium malformed top. Papaya ringspot virus was recently recorded in Johor afflicting Eksotika as well as the local varieties. Screening carried out at the National Chung Hsing University Taiwan in 1989 also confirmed that the Eksotika and other local popular varieties were susceptible. One variety Califlora from Florida was however quite tolerant. Some resistance was found against Cladosporium malformed top in varieties like Subang and Morib which Eksotika was extremely susceptible too. Work is now in progress in transfering PRV resistant genes from Cariflora and Cladosporium resistance from Morib and Subang to Eksotika

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Abstract

Papaya breeding in MARDI was started in 1972 and one of the major achievements in the programme was the development of the Eksotika variety released in 1987. It was high yielding had very good eating qualities and was widely accepted as an export fruit. However it also has several weaknesses. Further improvement of the Eksotika was achieved through hybridization with its sib line Line 19. The new F1 hybrid Line 19 x Eksotika was tolerant to fruit freckles had better fruit cosmetics and storage life and its yield was also 10-15 percent higher. Following the success of this F1 hybrid which showed hybrid vigour or heterosis even from a narrow cross the emphasis for research in the 90's will be the development of other F1 varieties using wide crosses and exploitation of hybrid vigour. The work so far has been in the determination of the compatibility of crosses between 6 selected inbreds developed at MARDI and the production of these hybrid seeds. Breeding for disease resistance is another area that will be extremely important in the 90's. This is particularly true for papaya ringspot virus PRV and Cladosporium malformed top. Papaya ringspot virus was recently recorded in Johor afflicting Eksotika as well as the local varieties. Screening carried out at the National Chung Hsing University Taiwan in 1989 also confirmed that the Eksotika and other local popular varieties were susceptible. One variety Califlora from Florida was however quite tolerant. Some resistance was found against Cladosporium malformed top in varieties like Subang and Morib which Eksotika was extremely susceptible too. Work is now in progress in transfering PRV resistant genes from Cariflora and Cladosporium resistance from Morib and Subang to Eksotika

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	CARICA PAPAYA
AGROVOC Term:	PROPAGACION DE PLANTAS
AGROVOC Term:	MALASIA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/15340

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