Recent developments in papaya breeding in the Philippines

Issue Date

3-2007

Abstract

The breeding and selection of papaya varieties in the Philippines started in the early 1980's resulting to the release of the hybrid 'Sinta' papaya moderately tolerant to PRSV in 1995. Very recently, the strategies for the development of papaya varieties have changed to address the needs of the changing markets. New breeding objectives were incorporated into the papaya breeding programme, and these were geared towards the development of industrial-type varieties that are suitable for latex/papain production for use in the manufacture of cosmetics and, processing-types that are red-fleshed and big-or small-fruited export types that are tolerant to papaya ringspot virus (PRSV). To date, 18 F1 hybrids from different crosses of highly inbred parents were generated. Out of these, three promising hybrids with suitable industrial criteria (bright red flesh, big-fruited, thick flesh) and fruit qualities (sweet, firm, high edible portion, pleasant flavour and aroma) plus tolerance to PRSV were identified. The hybrid of 'Kapoho' × 'Tainung' is better in terms of fruit weight (0.98 kg) and total soluble solids (TSS 12.94°B) compared with the better parent ('Tainung'), but the edible portion is intermediate (69.89%) of the two parents. The fruit weight (0.92 kg) and TSS (12.80°B) of the hybrid between 'Solo' × 'Cavite' is better than both parents, but the edible portion (68.74%) is intermediate of the parents. The hybrid of 'Cavite' × '4172' has fruit weight (1.08 kg) and edible portion (72.35%) almost intermediate of the parents, but the TSS (12.60%) is better than both parents. Six new inbred lines with specific traits intended for inbreeding were selected. Furthermore, a sex determination technique involving the use of the polymerase chain reaction (PCR) was used to predict the various sex types of papaya involving the gynodioecious 'Sinta' hybrid and its parents. The hermaphrodite individuals exhibited two distinct bands, 1.3 and 0.8 kb fragments, while the females showed only one band, a 0.8 kb fragment. In contrast, males showed none of these bands. Appropriate controls to rule out false positive amplifications were included. The advances obtained from this breeding work are being used for the development of suitable varieties for local and export markets.

Source or Periodical Title

Acta Horticulturae

ISSN

5677572

Volume

740

Page

49-60

Document Type

Article

College

College of Arts and Sciences (CAS)

Language

English

Subject

Breeding, F hybrids 1, Papain, Papaya, Sex determination

Identifier

https://doi.org/10.17660/ActaHortic.2007.740.5

Digital Copy

YES

Link to Full Text

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