Euphytica (2019) 215 (2 - 24)

Tathianne Pastana de Sousa Poltronieri, Silvaldo Felipe da Silveira, Marcelo Vivas, Renato Santa-Catarina, Alinne Oliveira Nunes Azevedo, Diego Fernando Marmolejo Cortes and Messias Gonzaga Pereira (2019)
Identification of papaya hybrids resistant to Stagonosporopsis caricae by heterosis: a possible reality?
Euphytica 215 (2 - 24)
Abstract: Papaya requires frequent applications of fungicides because of its high susceptibility to disease. However, no products capable of effectively managing the fungus Stagonosporopsis caricae are commercially available to date. Because of this limitation and the continuous demand for products free of chemical residues and that achieve higher yields, genetic improvement is necessary to obtain resistant and productive genotypes. The present study used lineages produced by backcrossing and hybrids obtained from the cross between these backcrossed lines and four elite genotypes (SS72-12, Sekati, JS-12, and 41/7) to identify genotypes with increased resistance to phoma spot. The analysis of the effects of heterosis evidenced the possibility of achieving high genetic gains. The evaluation of the incidence and severity of phoma spot indicated that hybrids Sekati × 1, 41/7 × 10, and JS-12 × 21 presented negative heterosis for phoma spot in all evaluated seasons. Considering standard heterosis, the hybrids Sekati × 1 and Sekati × 4 were the most resistant to disease. The Solo group genotypes SS × 04 and SS × 06 presented negative heterosis in at least one season for common and standard heterosis, evidencing that these cultivars were resistant to phoma spot. The obtained results on heterosis and papaya production allowed identifying promising cultivars.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Stagonosporopsis caricae	Papaya (Carica papaya)