Genetic analyses of lodging resistance and yield provide insights into post-Green-Revolution breeding in rice.
Plant Biotechnol J
; 19(4): 814-829, 2021 04.
Article
em En
| MEDLINE
| ID: mdl-33159401
ABSTRACT
Lodging reduces grain yield in cereal crops. Understanding the genetic basis of lodging resistance (LR) benefits LR breeding. In the study, 524 accessions from a rice germplasm collection and 193 recombinant inbred lines were phenotyped for 17 LR-related traits. Height and culm strength (the magnitude of applied force necessary to break the culm) were two major factors affecting LR. We conducted genome-wide association study (GWAS) and identified 127 LR-associated loci. Significant phenotypic correlations between culm-strength traits and yield-related traits were observed. To reveal the genetic relationship between them, we conducted GWAS of culm-strength traits with adding yield-related trait as a covariate and detected 63 loci linking culm strength and yield. As a proof, a near-isogenic line for an association locus on chromosome 7 showed enhanced LR and yield. Strikingly, 58 additional loci were identified in the covariate-added GWAS. Several LR-associated loci had undergone divergent selection. Linkage analysis supported the GWAS results. We propose that introgression of alleles beneficial for both culm strength and panicle weight without negative effects on panicle number or pyramiding high-yielding alleles and lodging-resistant alleles without effects on yield can be employed for the post-Green-Revolution breeding.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Oryza
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Plant Biotechnol J
Assunto da revista:
BIOTECNOLOGIA
/
BOTANICA
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
China