Selection for hypocotyl diameter results in genetic gain in common bean plant architecture

Abstract

Studies highlight the hypocotyl diameter (HD) as an effective indicator of plant architecture (PA). Here, we estimated the genetic gain based on HD to improve PA. Twenty populations of cycles zero (C 0 ) and one (C 1 ), both in the F 4 generation, were evaluated for PA, grain yield (GY) and HD. Plants with thickest HD in C 0 were intercrossed in a circulant diallel mating design. In cycle C 1 , an estimated genetic gain of 4.93% was achieved for PA and 4.95% for HD. The populations with the highest probability of breeding lines with a thicker HD belong to cycle C 1 , and this selection strategy did not alter the GY of the populations of this cycle. Thus, indirect selection based on HD is promising for breeding for common bean PA by recurrent mass selection.

Identification of superior progenies between common bean gene groups for root system obtained by recurrent selection

“…Gains by initial recombination cycles, for example from 3.3 to 9% for common bean grain yield, have already been reported (Silva et al 2010;Alves et al 2015). Genetic progress was also mentioned for this crop, e.g., 7% for grain type, 33.4% for rust resistance, 13.2% for angular spot resistance, 4.95% for hypocotyl diameter and 4.93% for plant architecture (Anjos et al 2018). The recurrent selection gains reported in this study were higher than gains in shoot traits, discussed in the literature.…”

“…In other studies, significant differences were also reported between populations improved in selection cycles, compared to the parents and progenies for the traits: hypocotyl diameter, plant architecture, grain yield and white mold susceptibility in common bean. (Souza et al 2014;Anjos et al 2018). Once the genetic divergence between treatments is known, genetic components can be estimated.…”

“…For the above-ground plant parts of common bean, numerous recurrent selection studies have already addressed variables such as crop cycle, growth habit, grain yield, grain appearance, disease resistance and others (Ramalho et al 2005;Silva et al 2010;Silva et al 2013;Souza et al 2014;Alves et al 2015;Leite et al 2016;Pereira et al 2016;Anjos et al 2018). The scarcity of studies focused on the root system might be related to the difficulty of phenotyping this trait in a large number of progenies.…”

Genetic and phenotypic parameters associated with soybean progenies in a recurrent selection program

“…With the aim of maximizing resources, as well as efficient use of the time necessary for identification of superior genotypes for recombination, recurrent selection is a useful strategy. Although this strategy has been promoted for breeding of allogamous plants, its use is reported in the literature in autogamous IO Soares et al plants like common bean (Pereira et al 2017a, Anjos et al 2018, Melo et al 2019) and soybean (Posadas et al 2014, Vello and Nazato 2017, Nie et al 2019. The use of this technique for the purpose of increasing grain yield in Brazil has not been reported in the literature.…”

Multipopulation recurrent selection: An approach with generation and population effects in selection of self‐pollinated progenies

“…We refer to this method of recurrent selection as multipopulation recurrent selection (MRS). In MRS, populations are advanced through inbred generations, and, at the end of each cycle, the best progeny of each population is selected for the next cycle recombination, crossing them among themselves and also pairwise (Alves et al., 2015; Anjos et al., 2018). This strategy allows one to exploit genetic variability more efficiently, and the parents are gradually introduced in the populations over cycles.…”