Diversity among genotypes of conilon coffee selected in Espírito Santo state

Abstract

ABSTRACT:The use of multivariate techniques for factor analysis is an efficient alternative for coffee breeding programs. This study aimed to evaluate the genetic diversity of 60 genotypes of conilon coffee based on agronomic performance in the northern state of Espírito Santo and to estimate the relative contribution of different agronomic characteristics towards the diversity of the species. The data were collected in an experiment conducted on the Experimental Farm of Bananal do Norte (Instituto Capixaba de Pesquisa, Assistência Técnica e Extenção Rural -INCAPER) in the southern state of Espírito Santo, and 12 agronomic characteristics were evaluated over four sequential harvests (4 years). Significant differences between the genotypes were observed for all of the characteristics, indicating the possibility of exploiting the high genetic variability to classify the genotypes into different groups based on their similarities. Of the agronomic characteristics, the duration of the ripening cycle was the variable that contributed the most to the variability among the 60 genotypes, with a relative contribution of 70.02%.

Selection of Conilon coffee clones for the Zona da Mata region of Minas Gerais, Brazil

“…Because it is characterized as quantitative, horizontal resistance presents a longer durabilty, which make it of utmost importance for genetic breeding programs aimed at resistance to leaf rust. This fact is corroborated by the different intensities of leaf rust symptoms observed in the 36 clones cultivated in this study (Table 2), as well as in a population of C. canephora cultivated at the field level (Rodrigues et al, 2012;Rodrigues et al, 2015), and under controlled conditions Mendonça et al, 2019).…”

“…Regarding the severity of leaf miners attack, no significant differences were observed among clones in all evaluated biennia (Table 3). The opposite of what was observed by Rodrigues et al (2015), which demonstrated a wide diversity concerning the attack of this pest among 40 clones of Conilon coffee. The response of variability observed among clones over the years may be related to genetic causes.…”

“…Another aspect to consider is the fruit maturation cycle, as it was observed among 60 conilon coffee genotypes in the state of Espírito Santo (Rodrigues et al, 2015), that earlier clones showed resistance to brown eye spot, which reinforces the importance of of this characteristic as an important management strategy in the control of this disease. This fact was also observed in this study for clones 03,01,13,05,11,15, 07 and 09 (Table 2).…”

“…However, to meet such demands, it is necessary to invest in technologies that provide the base for the expansion to new areas. Some research has been developed to evaluate, introduce and recommend clones of Conilon or Robusta coffee in different regions of the country (Moraes et al, 2020;Rodrigues et al, 2015;Silva et al, 2017;Spelline et al, 2018).…”

Genetic diversity among coffee tree progenies Big Coffee VL based on growth traits and production

“…Genetic variations among individuals of same or different species lead to genetic diversity, which must be ensured for sustainability of breeding programs, and continued availability of agronomically superior cultivars. Genetic diversity has been the subject of several studies in cultivated species, such as triticale (Niedziela et al, 2016), eucalyptus (Moraes et al, 2015), soybean (Ferreira Júnior et al, 2015), and coffee (Guedes et al, 2013;Silva et al, 2013;Moura et al, 2015;Rodrigues et al, 2015).…”