Phenotypically-desirable and PRSV-P tolerant papaya F₁ hybrids

Issue Date

4-2017

Abstract

The development of new papaya F₁ hybrids that are phenotypically-desirable and resistant to papaya ringspot virus-P (PRSV-P) is one of the important components of an integrated disease management strategy against the virus disease. While moderately tolerant varieties such as the Sinta provided some protection against the disease, new virus strains could evolve and overcome the resistance, hence new resistant varieties are necessary. Partial diallel crossing scheme was used to generate F₁ hybrids between diverse inbred lines. Eight F₁ papaya hybrids were evaluated for desirable horticultural traits and reaction to PRSV-P. Three hybrids were selected hybrids 4, 7 and 5. F₁ hybrid 4 is better than the other hybrids in terms of horticultural traits and virus reaction. It is semi-dwarf, had stout stem, thick flesh, higher TSS and edible portion than Sinta. It had a reduced symptom severity, delayed disease onset, slow disease progress and rate of disease development, reduced symptom severity, low disease index and lower virus titre than Solo, indicating a moderately tolerant reaction to PRSV-P. Hybrid 7 is semi-dwarf, had stouter stem, thicker flesh, higher TSS and had higher edible portion than Sinta. It had a delayed disease onset, slower disease progress, and virus titre lower than Solo, also indicating a moderately tolerant reaction to PRSV-P. Hybrid 5 is also semi-dwarf, had high TSS and an attractive bright red flesh. However, it had an early disease onset, faster disease progress and rate of disease development, making it moderately susceptible to PRSV-p. Overall, F₁ hybrids 4 and 7 were selected based on evaluation of horticultural traits and tolerance to PRSV-P.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463x

Volume

42

Issue

1

Page

75-83

Document Type

Article

Frequency

tri-quarterly

Physical Description

tables, graphs, pictures

Language

English

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