Research Article Adaptability and stability of corn hybrids in the off season across various agricultural regions in Brazil

Abstract

We evaluated how genetic x environment (G x E) interactions affect grain productivity in corn hybrids grown in traditional and non-traditional environments in the off or "second" season. Adaptability and stability of the hybrids was examined by parametric, nonparametric and multivariate methods. In 2016, 24 hybrids were evaluated in seven environments, in 2017, 13 hybrids were evaluated in six environments. The environments were located between the regions of Southwestern and Southeast Goiás state; Triângulo Mineiro and Alto Paranaíba, in the western and northwestern regions of Minas Gerais state. In all trials, complete randomized blocks were adopted, and grain productivity was determined. The statistical analyses were performed with two different softwares: Estabilidade and Genes. It was observed that in both seasons, the locals considered as traditional corn cultivation in the off season Jataí-GO and Montividiu-GO gave ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 18 (3): gmr18193 A.P. Mijone et al. 2 the highest yields, with average yields higher than national averages, producing 3859 kg.ha-1 in 2016 and 5562 kg.ha-1 in 2017. The methods of Eberhart and Russell, Lin and Binns modified by Carneiro, Centroid and AMMI gave similar results in the rankings of the adaptation and stability of the hybrids. We concluded that the G x E interaction for grain productivity of corn hybrids grown in the off-season is complex in nature.

Adaptability, stability and environmental stratification of genetically and nongenetically modified corn in the Cerrado

“…Additionally, low rainfall was recorded in Paraiso between 20/12/2018 and 10/01/2019, when plants were in the stage at which their yield potential is defined. Mijone et al (2019) found that unfavorable environments may result from an inadequate climate or limited use of technology and resources.…”

“…Environmental stratification and the identification and use of cultivars with high adaptability and stability are alternatives to mitigate the effect of interaction (C × E) (Mijone et al, 2019). Identifying similar environments streamlines breeding programs and lowers costs because it allows breeders to eliminate similar environments within each group without compromising the efficiency and precision of the selection process (Cruz & Regazzi, 2007).…”

Potential of root acid phosphatase activity to reduce phosphorus fertilization in maize cultivated in Brazil

“…A second field study was conducted from April to September 2019 in an area located close to where Field study 1 took place. We used 13 commercial hybrids (S2 Table ), widely used in the region [34][35][36][37][38][39][40][41][42][43][44], with cycle is semi-early, early or super-early, single-cross and double-cross. In three randomized blocks and two treatments: Control-NK addition (20 kg.ha -1 (N): 0 (PO 4 ): 33.2 kg.ha -1 (K)), or NPK fertilization (20 kg.ha -1 (N): 51.6 kg.ha -1 (PO 4 ): 33.2 kg.ha -1 (K)).…”