Characterization of coffee cultivars leaf rust-resistant subjected to framework pruning

Abstract

The goal of our work was to evaluate physiological and agronomic traits, as well as the relationship between these traits in coffee cultivars coming from a germplasm supposedly resistant to leaf rust, and their response to framework pruning. The experiment was conducted at the Federal University of Lavras in randomized blocks with three replicates, with spacing of 3.5 x 0.7 m and plots of 12 plants. An amount of 25 coffee cultivars was evaluated, from which 23 were considered resistant and two susceptible to leaf rust. Traits analyzed were the plagiotropic branch length and number of nodes, net photosynthetic rate, transpiration rate, water use efficiency, fluorescence and chlorophyll index, leaf area index, leaf rust incidence and yield. Catucaí Amarelo 20/15 cv 479, Araponga MG1 and Tupi IAC 1669-33 cultivars show highly responsive to framework pruning. These cultivars have high yield associated to high net photosynthetic rate, water use efficiency and low transpiration rate. Moreover, the last two cultivars show a low incidence of leaf rust. The Acauã cultivar has a good response to framework pruning, showing high yield associated to lower incidence of leaf rust. Catucaí Vermelho 785/15 cultivar is not responsive to framework pruning because show lower yield, high incidence of leaf rust, low vegetative growth and low water use efficiency.

Agronomic, anatomic and physiological characterization of Coffea arabica L. genotypes on irrigated system in the Central Cerrado

“…Other researchers have found great yield for this genotype in coffee-growing areas in the state of Minas Gerais. In the south of Minas Gerais, Reis et al (2018) reported an annual yield of 77.63 bags ha -1 for this genotype, a value that is similar to what was found in this current study and, in Alto do Paranaíba region, considering the biennial, Carvalho et al (2017) found an average yield of 37 bags ha -1 .…”

Agronomic performance of coffee in response to framework pruning in cycles of the “safra zero”

“…These data support Reis et al (2018), who also found higher values in response to the pruning for the Tupi IAC 1669-33, Yellow Catucaí 20/15, Araponga MG1 and Acauã Cultivars, these demonstrating efficiency to the "safra zero" system, for they presented a lower vegetative growth during their reproductive development. The average numbers followed by the same letter in the column do not differ among themselves, by the Scott-Knott test, to 5% of probability.…”

“…Besides the already identified genes, other genes, related to the resistance to leaf rust are likely present in these genotypes (Varzea; Marques, 2005), conditioning a higher resistance to the genotypes arisen from such breeding processes. Other authors also confirmed the resistance to leaf rust of materials originated from the "Timor Hybrid" (Paiva et al, 2010;Reis et al, 2018).…”

Physiological aspects and yield in coffee progenies with large beans

“…Plants with low yield can invest in vegetative growth, according to Reis et al (2018), which probably happened to progeny S34, wherein its photoassimilates may have been translocated to developing regions for the high load of fruit yielded in 2017 (Table 4). This fact is due to the fruits acting as priority drains, so that the dry matter allocation to them tends to be greater than that assigned to the growth of the vegetative branches throughout the annual yield cycle, according to the estimate of Vaast et al (2005).…”