Genetic divergence in biomass sorghum genotypes through agronomic and physical-chemical characters

Taiana Paula Streck Vendruscolo,Valvenarg Pereira Da Silva,Rafhael Felipin-Azevedo,Marcilene Alves De Souza Castrillon,Flávio Dessaune Tardin,Raiane Scandiane Da Silva,Marco Antonio Aparecido Barelli,Carla Lima Corrêa

doi:10.33448/rsd-v9i9.7536

Taiana Paula Streck Vendruscolo, Valvenarg Pereira Da Silva + Show 6 more

Open Access

https://doi.org/10.33448/rsd-v9i9.7536

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Abstract

The present research aimed to evaluate the genetic divergence in 34 sorghum biomass genotypes via agronomic and physicochemical characters. The design used was randomized blocks with three replications. The agronomic and physical-chemical characteristics evaluated were: days for flowering, number of stems, plant height, number of leaves, green mass production, dry mass production, determination of total ash, determination of volatile content, insoluble lignin and determination of fixed carbon content. The data were submitted to analysis of variance and then, to estimate divergence, the generalized Mahalanobis distance was used as a measure of dissimilarity. Based on this matrix, the methods of Tocher's optimization clusters and the Hierarchical method of Average Grouping Between Groups (UPGMA) were used, and analysis of canonical variables, and the projection based on the first two canonical variables arranged in two-dimensional space. Singh criterion was also used to quantify the relative contribution of these characteristics to genetic divergence. The evaluated genotypes showed significant differences for all the evaluated characteristics. The combination between the 201429B001 and 201429B028 (394.98) genotype pairs was the most divergent and the combination between the 201429B015 and 201429B031 (6.31) genotypes was the most similar. The grouping generated by the Tocher Optimization method, hierarchical UPGMA and graphical dispersion showed similarity in the grouping of genotypes. The first two canonical variables were sufficient to explain about 81.78% of the total variation observed. The results showed a wide genetic diversity among the 34 genotypes of sorghum biomass.

Highlights

The cultivation of biomass sorghum [Sorghum bicolor (L.) Moench] has proved to be a widespread crop in the world, with a high content of fermentable fibers and sugars, which can be explored on a large scale and with great adaptability to various edaphoclimatic conditions (Carrillo et al, 2014)
The results showed a wide genetic diversity among the 34 genotypes of sorghum biomass
Several researches are carried out with this culture, among them, the study of the divergence of sorghum biomass aiming at the production of bioenergy, it is important to identify, characterize and quantify genetic diversity, since the success of any genetic improvement program, is based on the presence of variability for the characteristic to be improved (Oykunle, 2015)

Summary

Introduction

The cultivation of biomass sorghum [Sorghum bicolor (L.) Moench] has proved to be a widespread crop in the world, with a high content of fermentable fibers and sugars, which can be explored on a large scale and with great adaptability to various edaphoclimatic conditions (Carrillo et al, 2014). In this context, this research aimed to estimate genetic divergence between sorghum biomass genotypes based on agronomic and physical-chemical characteristics, using multivariate analysis techniques

Objectives

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Results