Clonal Arabica coffee resistant to Meloidogyne paranaensis and damage threshold on plants development

Author(s)

dos Reis Fatobene, Barbhara Joana ; Goncalves, Wallace ; Goncalves Oliveira, Claudio Marcelo ; Guerreiro Filho, Oliveira

• Document type: Journal article
• Source: CIENTIA AGRICOL; v. 76, n. 3, p. 5-pg., 2019-05-01.

Abstract

Plants of Coffea arabica Icatu IAC 925 germplasm show resistance to Meloidogyne paranaensis under field conditions, but with variable rates of segregation. One mother plant, IAC 3, of Icatu IAC 925 was evaluated under controlled conditions through the reaction of its clones, obtained by somatic embryogenesis. Reproduction of nematodes in clones were compared with an open-pollinated progeny from the same mother plant, C. arabica cultivar Mundo Novo IAC 515-20, susceptible to nematodes, and Clone IAC 1, also susceptible and obtained by somatic embryogenesis. Open-pollinated progeny showed segregation to resistance and was classified as susceptible according to the reproduction factor. The average number of nematodes (eggs and J2) per gram of roots in clones was eight fold lower than that of open-pollinated progeny, and 51 fold lower than Mundo Novo IAC 515-20. Based on Seinhorst model, IAC 3 clone showed a tolerance limit of 7.7 nematodes per cm(3) of soil, while in Mundo Novo the tolerance limit was 3.9 nematodes per cm(3) of soil. These results revealed that clonal Arabica coffee nematode-resistant trees represent an alternative to the time consuming and expensive process inherent to conventional breeding strategies. (AU)

• FAPESP's process: 10/15416-0 - Selection of coffee trees with multiple resistance to Meloidogyne nematodes by parasitological, phytopathological and molecular analysis
• Grantee: Bárbhara Joana dos Reis Fatobene
• Support Opportunities: Scholarships in Brazil - Doctorate