Genetic gain in agronomic traits of common bean in the region of Planalto Catarinense

Abstract

The purpose of this study was to predict the genetic progress in the selection for common bean agronomic traits based on the trait expression, using two indices of adaptive selection. The existence of correlation between various traits in common bean breeding is a major restriction, but some tools that allow breeders to predict the expected gains could optimize results. The following traits were evaluated:(1) plant cycle (days), (2) plant height (in cm), (3) stem diameter (cm), (4) insertion of the first pod (cm); (5) number of pods per plant; (6) number of grains per pod; (7) pod length (cm). Results show the possibility of selecting accessions for several agronomically important traits evaluated together. The only genotype selected by both indices was UDESC 03, confirming the possibility of selecting plants with superior agronomic traits among genotypes of common bean landraces.

Research Article Upright plant architecture traits and their relationship with grain yield in the selection of Mesoamerican common bean lines cultivated at low altitude

“…High heritability (h 2 : 63.20 to 93.20%) for upright plant architecture traits and grain yield was obtained (Table 4). These values were similar to those reported earlier in Mesoamerican common bean experiments for lodging (Mendes et al, 2011;Jost et al, 2013;Soltani et al, 2016), insertion of the first pod (Bertoldo et al, 2010), plant height (Bertoldo et al, 2010;Carneiro et al, 2017), and grain yield (Mendes et al, 2011;Jost et al, 2013). When heritability is high, genetic variance is the main component of phenotypic variance, indicating progress in genetic breeding due to the great genetic variability observed for the traits evaluated.…”

Methods of selecting common bean lines having high yield, early cycle and erect growth

“…These values were higher than those observed by Bertoldo et al (2010), who obtained an average of 16.30 cm when evaluating 22 common bean accessions in the Santa Catarina state in Brazil. The highest mean for the insertion of the first pod (17.41 cm), and the largest number of lines which were superior in this characteristic, were observed when the lines were advanced under the SSD method (Table 2, Figure 1).…”

Construction and Efficiency of Selection Indices in Wheat (Triticum aestivum L.) under Drought Stress and Well-Irrigated Conditions

“…In a study by Cargnin et al (2007), estimation of the genetic progress for selection of wheat agronomic traits illustrated that the indices Brim-William (Williams 1962) and Pesek and Baker (1969) with the economic weight of one unit were slightly superior to Smith-Hazel index. Nonetheless, in some studies (Cruz et al 1993;Bertoldo et al 2010;Salehi and Saeidi 2013;Jafarzadeh-Ghahdarijani et al 2014) genetic gain with the Smith-Hazel has been higher than that predicted by other indices.…”

“…Reviewing literatures indicates that most studies of plant selection frequently have focused on single trait or multiple-trait selection without considering the interrelationship, heritability and the weight of traits and less effort has been devoted to index-based selection (Bertoldo et al 2010;Mohammadi et al 2013;Fioj et al 2016). Individual plant selection based on a single trait may result in genetic variation loss in other traits of importance specifically for circumstances of low yielding environments (Hazel and Lush 1942;Falconer and Mackay 1996).…”