Adaptability and stability of genotypes of sweet sorghum by GGEBiplot and Toler methods

Abstract

ABSTRACT. Sweet sorghum has considerable potential for ethanol and energy production. The crop is adaptable and can be grown under a wide range of cultivation conditions in marginal areas; however, studies of phenotypic stability are lacking under tropical conditions. Various methods can be used to assess the stability of the crop. Some of these methods generate the same basic information, whereas others provide additional information on genotype x environment (G x E) interactions and/or a description of the genotypes and environments. In this study, we evaluated the complementarity of two methods, GGEBiplot and Toler, with the aim of achieving more detailed information on G x E interactions and their implications for selection of sweet sorghum genotypes. We used data from 25 sorghum genotypes grown in different environments and evaluated the following traits: flowering (FLOW), green mass yield (GMY), total soluble solids (TSS), and tons of Brix per hectare (TBH). Significant G x E interactions were found for all traits. The most stable genotypes identified with the GGEBiplot method were CMSXS643 for FLOW, CMSXS644 and CMSXS647 for GMY, CMSXS646 and CMSXS637 for TSS, and BRS511 and CMSXSS647 for TBH. Especially for TBH, the genotype BRS511 was classified as doubly desirable by the Toler method; however, unlike the result of the GGEBiplot method, the genotype CMSXS647 was also found to be doubly undesirable. The two analytical methods were complementary and enabled a more reliable identification of adapted and stable genotypes.

Association among agro-industrial traits and simultaneous selection in sweet sorghum

“…The lines BR501, CMSXS642, CMSXS643, and hybrid BSW80147 were highlighted for being late. This result is similar to that reported by de Figueiredo et al (2015). PH ranged from 1.36 to 3.49 m (Figure 1).…”

Contribution of Agronomic Traits for Sugar Yeld in Sweet Sorghum Genotypes

“…R² estimates above 75% were observed for the traits PH, PS PP and Brix (Table 1), which together to the quotient b allow inferring that these traits are subject to significant genetic gains into successive selection cycle. (Table 2), similar to the noticed by Sandeep et al (2011), Rani andUmakanth (2012) and Figueiredo et al (2015). The main cause of phenotypic correlation between two traits is the pleiotropism, property by which a gene affects more than one trait simultaneously; and linkage disequilibrium, nonrandom association between alleles from different loci (Mode & Robinson, 1959).…”

General and specific combining ability in sweet sorghum

“…Genotype × site interaction (P < 0.05) was also observed for most of the traits, except for juice extraction (EXT). Some studies on sweet sorghum have indicated the presence of the genotype × environment interaction for traits related to ethanol yield (ETH) (Umakanth et al 2012, Souza et al 2013, Elangovan et al 2014, Figueiredo et al 2015.…”