Obtaining crisphead and curled green leaf-type lettuce lines resistant to Bremia lactucae and monitoring of the pathogen races.

• Grant number: 18/17024-3
• Support Opportunities: Regular Research Grants
• Start date: December 01, 2018
• End date: May 31, 2021
• Field of knowledge: Agronomical Sciences - Agronomy - Crop Science
• Principal Investigator: Leila Trevisan Braz
• Grantee: Leila Trevisan Braz
• Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil
• Associated researchers: Marcus Vinícius Marin ; Pablo Forlan Vargas ; Rita de Cassia Panizzi

Abstract

Lettuce is one of the most produced and consumed vegetables worldwide. Several diseases decrease its production, but in mild climate, downy mildew (Bremia lactucae) stands out. Genetic resistance is widely accepted as the most sustainable control strategy. Since 2002, the Núcleo de Estudos em Olericultura e Melhoramento of UNESP-FCAV has been developing curled green-leaf lettuce lines resistant to this disease.However, new races have been reported, generating demand for the incorporation of new sources of resistance that are effective against all races of the pathogen. In addition, the segment of crisphead lettuces has been growing significantly, which encourages the insertion of this type of genotype in genetic breeding programs.Thus, this project will seek to transfer genes that confer resistance to the new B. lactucae races for lettuce of the crisphead and curled green leaf-type groups, and to monitor the races in the state of São Paulo, in continuity with the breeding program of UNESP-FCAV.The source of resistance to be used will be 'Balesta', and through backcrossing. The recurrent parental of curled green leaf-type lettuce will be lines resistant to some races of the pathogen and with good agronomic performance, and of crisphead lettuce will be cultivars with excellent plant pattern and head formation. Monitoring of B. lactucae races will be done from June to August. The sites to be sampled will be chosen in a way that represents the geographical distribution of the state of São Paulo, as well as the contribution in the percentage of lettuce production. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SOUZA, LARISSA N.; MARIN, V, MARCUS; FRANCO, CAROLINA A.; SILVA, EDGARD H. C.; CAPRIO, CARLOS H.; PANIZZI, RITA C.; BRAZ, LEILA T.; LEBEDA, ALES. onitoring virulence and sexual compatibility in Brazilian Bremia lactucae population. PLANT PATHOLOGY, v. 71, n. 2, OCT 2021. (18/17024-3)