Genetic divergence and phosphorus use efficiency in the soybean with a view to biodiesel production

Abstract

-The soybean has an important role in the area of biodiesel, due to having a productive potential and technical feasibility able to meet the growing demand for renewable fuels. In the agricultural year of 2009/10, four competitive trials of soybean cultivars were carried out, two on the Campus of Palmas University and the other two on the University Campus at Gurupi, with a study of genetic divergence being undertaken. At each location, the cultivars were trained under conditions of both high and low phosphorus (150 kg ha -1 P 2 O 5 and 30 kg ha -1 P 2 O 5 respectively). The experimental design employed for each trial was of randomised blocks with three replications and 11 treatments. The percentage of oil as a characteristic was studied, and the efficiency of phosphorus usage by the cultivars determined employing the methodology adapted from Fischer (1983). Genetic divergence was evaluated using multivariate procedures: the generalised Mahalanobis distance and Tocher's optimisation method for clustering. In the study of genetic divergence, each test represented a distinct variable in the multivariate model. The cultivars M-SOY 9350, M 8766RR and BR/EMGOPA 314 are the most suitable for the production of biodiesel. The hybrids M 8766RR x M 9056RR, BR/EMGOPA 314 x M 9056RR, P98R91 x M 9056RR are promising for obtaining segregating populations to be used for their oil content.

Agronomic performance and genetic diversity among lines and soybean cultivars

“…Grouping of genotypes obtained by UPGMA and Tocher optimization methods were identical; corroborating with results obtained by Almeida et al(2011), Reina et al (2014, and Sousa et al (2015), who also reported similarity between two methods.…”

“…In addition, Sousa et al (2015) observed eight groups by using a cutoff point of 43%. Reina et al (2014) defined the cutoff point in 52% of dissimilarity in the dendrogram, which separated the evaluated genotypes into six groups.…”

“…The new hybrid combinations should be established based on the magnitude of their dissimilarities, as well as on the potential of the parents (ALMEIDA et al, 2011;REINA et al, 2014).…”

Genetic divergence of roundup ready (RR) soybean cultivars estimated by phenotypic characteristics and molecular markers

“…Within this context, Peluzio et al (2012) and Shadakshari et al (2011) have used the Tocher's optimization method to estimate the diversity among genotypes evaluated by agronomic traits. Reina et al (2014), also based on agronomic traits and using Tocher method, verified 11 cultivars separated into four genetically distinct clusters.…”

Research Article Intraspecific variability of popcorn S lines for phosphorus efficiency in the soil.

“…Research has been carried out on genetic diversity in phosphorus use efficiency in many crops, using multivariate techniques, and yielded very encouraging results (Cock et al, 2002;Mundim et al, 2013;Reina et al, 2014); however, there are no literature studies addressing the mineral nutrition as it relates to the popcorn crop under field conditions. Given the current agricultural scenario, the generation of cultivars better adapted to soils poor in phosphorus and the introduction and use of genotypes selected for certain environments bring an interesting perspective about the efficiency in the use of the phosphate fertilizer and the sustainability of the production system.…”