Abstract
With the aim of to evaluate the correlation and the direct and indirect effects of morphological descriptors on oil content of castor ( Ricinus communis L.) genotypes, an experiment was conducted in the agricultural years 2010/2011 and 2011/2012 at Universidade Estadual de Mato Grosso do Sul – Unit of Aquidauana (UEMS/UUA). The experimental design used was randomized blocks with three replications. The treatments consisted of seven castor genotypes (BRS Energia, IAC-2028, IAC-Guarani, BRS Nordestina, BRS Paraguacu, IAC-80 and IAC-226). The following descriptors were evaluated: plant height (PH), stem diameter (SD), number of bunches (NB), number of fruits (NF), mass of fruits (MF), mass of hundred seeds (MHS) and oil content (OC). Initially, it was determined the following genetic parameters: genotypic variance, environmental variance, coefficient of experimental variation, coefficient of genotypic variation, heritability, environmental correlations, phenotypic correlations and genetic correlations. The phenotypic correlations were deployed by path analysis in estimates of direct and indirect effects, and preceded the diagnosis of multicollinearity in explanatory variables and independent explanatory variables on the OC (primary dependent variable). The results indicated that the direct and indirect selection of genotypes with plant height, stem diameter, number of bunches and mass of hundred seeds is promising to select genotypes with high oil content in castor.
Highlights
Castor (Ricinus communis L.) is a valuable oilseed crop that provides almost the entire world’s supply of hydroxy fatty acids (TORRES et al, 2015)
The experiment was installed in the agricultural years 2010/2011 and 2011/2012 in the experimental area of the Universidade Estadual de Mato Grosso do Sul, (State University located in the city of Aquidauana, Mato Grosso do Sul - Brazil) (UEMS/UUA)
The soil was classified as Ultisol sandy loam texture (TORRES et al, 2014), with the following chemical features in the layer 0 – 0.20 m: pH (H2O) = 6.2; Al exchangeable = 0.0; Ca+Mg = 4.31; P = 41.3; K = 0.2; Organic matter (g dm-3) = 19.7; V (%) = 45.0; m (%) = 0.0; Sum of bases = 2.3; cation exchange capacity (CEC) = 5.1
Summary
Castor (Ricinus communis L.) is a valuable oilseed crop that provides almost the entire world’s supply of hydroxy fatty acids (TORRES et al, 2015). It is used in the production of lubricants, paints, soaps and pharmaceuticals. The castor belongs to the family Euphorbiaceae. It is an essentially tropical/subtropical species and it grows naturally over a wide range of geographical regions including temperate areas. Exploitation of castor ranges from the simple harvesting of beans from wild plants through the cultivation of hybrid varieties and the use of improved cultivation methods. But where it is deliberately cultivated an annual production cycle is possible (GOGOI et al, 2009; DHEDHI et al, 2010)
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