Agronomic characterization and responses to coffeeleaf rust in coffee progenies resistant to the gall nematode Meloidogyne exigua

Abstract

The aim of this study was to determine agronomic characteristics and responses to the coffee leaf rust fungus (Hemileia vastatrix Berk. et Br.) in coffee progenies resistant to the gall nematode Meloidogyne exigua. The experiment was conducted in December 2000 at Ouro Verde Farm (FazendaOuro Verde), located in the municipality of Campos Altos -Minas Gerais (MG). Ten F 3:4 progenies were evaluated. They were derived from crosses between CIFC 2570 Timor Hybrid selections and Catuaí cultivars known to be resistant to M. exigua. The Catuaí Vermelho IAC 99 cultivar served as a control. A randomized block design with three replicates was used. In total, there were thirty-three plots consisting of eight plants each. The following characteristics were assessed between the harvests of 2011/2012 and 2014/2015: (a) yield expressed as processed coffee bags ha -1; (b) rust incidence and severity; (c) vegetative vigor; (d) percentage of coffee fruits at the "cherry" stage; (e) percentage of floaters; (f) crown diameter; (g) percentage of coffee beans of size sieve 17 and higher; and (h) sensory analysis of the coffee beverage. The results indicated the following: (a) the H514-7-14-2, H514-7-4-5, H493-1-2-2, H514-7-16-3, H514-7-8-11, H518-2-10-1, and H514-5-2-4 progenies were the most productive; (b) all progenies showed promising resistance to coffee leaf rust; (c) all genotypes had the potential for specialty coffee production; (d) the H493-1-2-2 progeny showed resistance both to rust and the nematode, and has good potential for specialty coffee production; and (e) the yields of the H514-7-8-11, H518-2-10-1, H514-5-2-4, H514-7-16-3, H514-7-14-2, H514-7-4-5, and H493-1-2-2 progenies were significantly higher than that of the Catuaí IAC 99 control.

Resistance Variability of Arabica Coffee Genotypes (Coffea arabica L.) to Leaf Rust Disease (Hemileia vastatrix)

“…However, resistance to coffee leaf rust disease controlled by nine major dominant genes (Silva et al, 2006) or at least one gene with two alleles (Diola et al, 2011), which makes selection needs to be conducted several times. Variations in Arabica coffee genotypes support the coffee breeders in obtaining genotypes that are resistant to coffee leaf rust disease (Caicedo, Guerrero, Roux, & Wingfield, 2013;Harni et al, 2015;Hindorf & Omondi, 2011;Hulupi et al, 2013;Ibrahim et al, 2016;Rezende et al, 2017;Sugiarti, 2017). In addition, coffee plant with high resistance to coffee leaf rust disease presumably has high production (Costa et al, 2013).…”

Photochemical efficiency correlated with candidate gene expression promote coffee drought tolerance

“…Plants were scored according to a ten point arbitrary scale in which score 1 corresponds to plants with the poorest vegetative vigor and marked depletion symptoms. The score 10 indicates plants with excellent vigor, more leafy and with marked vegetative growth of the productive branches 51 , 52 . Productivity is measured by weighing the fruit immediately after harvest.…”

Incidence and Severity of Coffee Leaf Rust, Cercosporiosis and Coffee Leaf Miner in Coffee Progenies

“…In the case of coffee leaf rust resistance of the nonspecific or polygenic type, it is desirable because it is durable, while the specific resistance can be broken by new genotypes of the pathogen (COSTA et al, 2013). Most of the hybrids studied presented low RI and RS, a fact that is desired by researchers because they are sources of durable and efficient resistance against multiple races of a specific pathogen (REZENDE et al, 2017), not hiding the expression of horizontal resistance (BOTELHO et al al., 2010).…”