Work

Novel chromosome segment substitution lines derived from japonica cultivar ‘Yukihikari’ in the genetic background of ‘Joiku462’ cultivar and identification of quantitative trait loci for heading date and grain quality

Year: 2025

Type: article

Abstract: In this study, we mapped quantitative trait loci (QTLs) associated with heading date and grain quality traits in a novel set of 44 chromosome segment substitution lines (CSSLs) derived from closely related rice (Oryza sativa L. ssp. japonica) cultivars ‘Yukihikari’ (good grain quality) and ‘Joiku462’ (superior eating and high grain appearance qualities). Days to heading (DTH), apparent amylose content (AAC), protein content (PC), thousand brown-grain weight (TBGW), brown grain length (BGL), brown grain width (BGWI), brown grain thickness (BGT), and the contents of 12 mineral elements (S, P, Mg, Ca, K, Mo, Cu, Zn, Mn, Fe, Sr, and Si) in polished rice were evaluated in 44 CSSLs grown in two different environments. We identified 78 QTLs, including 8, 7, 8, 8, 19, 10, and 10 for DTH, AAC, PC, TBGW, BGL, BGWI, and BGT, respectively, and 2, 1, 3, and 2 for S, Mo, Cu, and Zn contents, respectively. Several QTLs were observed in the same region, forming 17 clusters on chromosomes 1–10. These QTLs can facilitate gene isolation and breeding to develop rice cultivars with optimum heading time and improved grain quality.

Source: Ikushugaku zasshi

DOI: 10.1270/jsbbs.24058

Authors: Kiyoaki Kato, Shinya Munekata, Toshiro Watanabe, Takashi Sato, Yusuke Hosokawa

Institutions: Obihiro University of Agriculture and Veterinary Medicine, Hokkaido Research Organization, Hokkaido University, Kumiai Chemical Industry (Japan)

Language: English

Topic: Genetic Mapping and Diversity in Plants and Animals

Subfield: Genetics

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

SDG: Zero hunger

Open Access status: diamond

Funders: Canon Foundation in Europe, Tojuro Iijima Foundation for Food Science and Technology