Selection of soybean elite cultivars based on phenotypic and genomic characters related to lodging tolerance

Abstract

Soybean lodging can result in serious yield reduction. Detecting the quantitative trait loci (QTL) associated with lodging tolerance for their further application in marker‐assisted selection (MAS) has the potential to enhance soybean breeding efficiency. In this study, a genome‐wide association analysis (GWAS) was performed to identify soybean accessions that could potentially be used to produce lodging‐tolerant varieties, based on the comprehensive evaluation of lodging scores (LS) obtained for the parental cultivar “Tokachi nagaha” and its 137 derived cultivars. Results showed that genotype, environment and genotype × environment interaction significantly influenced LS. Of the 31 significant SNPs identified, 22 were consistently detected in two or more environments and 27 SNPs were located in or close to agronomically important QTL mapped by linkage analysis. Best linear unbiased predictors (BLUPs) of LS tend to decrease with the elite alleles contained by accessions increasing. Some excellent accessions, with lower BLUPs and Di (stability coefficients) values and more elite alleles, were selected. This study contributed to understand the genetic mechanism of lodging, providing genetic and phenotypic information for MAS.

GmBICs Modulate Low Blue Light-Induced Stem Elongation in Soybean

“…Intercropping and high-density planting have been widely used to increase soybean production. However, these two cultivation modes usually induce unfavorite SAS (Libenson et al, 2002;Egli and Bruening, 2005;Ballare et al, 2012;Wang H. et al, 2016), especially the exaggerated stem elongation that confers serious lodging and reduction of yield over 20% in soybean (Noor and Caviness, 1980;Cober et al, 2005;Carriedo et al, 2016;Liu et al, 2017).…”

GmCRY1s modulate gibberellin metabolism to regulate soybean shade avoidance in response to reduced blue light

“…All field experiments were performed in three independent plots. Representative plants were photographed and subjected to phenotype investigation at the maturation stage, and the lodging phenotype was assessed at maturity stage R8 according to a previous method (Liu et al, 2017). Plants whose main stem leaned more than 45 were considered to have lodged.…”

“…Despite permitting adaptive growth in competitive situations, SAS has grave consequences: resources are diverted from agronomically important tissues to support stem elongation, which subsequently leads to lodging that can reduce soybean yield by as much as 22% (Noor and Caviness, 1980;Carriedo et al, 2016). Therefore, the key constraint to high-density planting or intercropping is the shade-induced exaggerated stem elongation of most soybean cultivars (Cober et al, 2005;Liu et al, 2017). To date, the physiological and molecular mechanisms of SAS in soybean remain largely unknown.…”

Bulk pollen pollination in maize for efficient construction of introgression populations with high genome coverage

“…Introgression populations consist of a set of introgression lines or families, constructed by continuous backcrossing to the recurrent parent, while carrying a limited number of chromosome segments from a donor parent in their genomes. In crop breeding, introgression populations were used to improve some traits of a crop variety, especially when a variety was found to be sensitive to a specific disease, drought stress or lodging (Dutra et al., ; Liu, Han, et al., ; Liu, Li, et al., ). Introgression populations were also used for pyramiding multiple quantitative trait locus/loci (QTL) in the same background (Liu et al., ; Reinke, Kim, & Kim, ), generating varieties with multiple beneficial alleles.…”