Genetic and chemical control of coffee rust (Hemileia vastatrixBerk et Br.): impacts on coffee (Coffea arabicaL.) quality

Abstract

BACKGROUND The occurrence of diseases can alter coffee (Coffea arabica L.) metabolism, causing changes in the composition of coffee beans and beverage quality. However, little is known about which aspects of coffee quality are actually altered by rust (Hemileia vastatrix Berk et Br.) and by its main control methods. The effect of chemical and genetic methods for the control of coffee rust on the quality of coffee beans and beverage was investigated. RESULTS Both genetic and chemical control reduce the damage caused by the disease in the composition of coffee beans. Genotypes with resistant ancestry, even with resistance breakdown, respond better to chemical control. The combination of genetic and chemical control favors an increase in the sugar content in the beans. CONCLUSIONS Despite the fact that both genetic and chemical control are effective in reducing disease damage regarding the chemical composition of beans, the quality potential of Timor Hybrid genotypes associated with the cancellation of rust expression through the joint action of genetic and chemical control favors the composition of beans and, consequently, the quantitative assessment of sensory attributes, adding value to the final product. © 2020 Society of Chemical Industry

In vitro pollination and fluorescence microscopy for characterization of gametophytic self-incompatibility of Coffea canephora Pierre ex A. Froehner

“…The use of tester plants for determination of compatibility groups is based on evaluation of the compatibility response in comparison to a plant of known genotype for the S gene. Under this same principle, tester plants of C. canephora have been used for identification of rust (Hemileia vastatrix) races, since the resistance response is also governed by few genes of greater effect (Pereira et al 2020). This method allows reduction in the number of hybridizations (n) necessary for diagnosis of compatibility of g genotypes from n.(n-1)/2 to n.t, where t is the number of tester plants.…”

Initial vegetative and reproductive development of coffee cultivars in Vale do Ribeira Paulista

“…The occurrence of brown eye spot on leaves of Arabica coffee cultivars manifested at levels higher than those related to the leaf miner, certainly favored by the high temperatures, relative humidity and light intensity, conditions that favor the development of the pathogen and its manifestation in susceptible hosts (A. M. Carvalho et al, 2012;Pereira et al, 2020). The results presented in Figure 2 show a greater presence of leaves with symptoms of the disease between September and November, with a higher incidence, in this period, in cultivars Catuaí Amarelo IAC 62, IAC 125 RN, Obatã IAC 4739, Arara and Catucaí Amarelo 24/137.…”

Essential Oils and Antagonistic Microorganisms as Eco-Friendly Alternatives for Coffee Leaf Rust Control

“…Just as disease appearance may alter the metabolism of coffee plants, causing changes in coffee grain composition and quality of the beverage [109], the different inputs used for disease control may also modify the organoleptic and fruit quality characteristics [1]. In the last years, research on the potential use of essential oils in agriculture has increased considerably.…”