Genetic diversity among the varieties exhibiting early heading date in rice

• Published in: Euphytica Vol. 218; no. 2
• Main Authors: Fujino, Kenji, Kawahara, Yoshihiro, Shirasawa, Kenta
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.02.2022; Springer; Springer Nature B.V
• Subjects: Adaptability; Agricultural research; Biological diversity; Biomedical and Life Sciences; Biotechnology; Clusters; Cultivation; Domestication; Environmental conditions; Genes; Genetic diversity; Grain cultivation; Life Sciences; Mutation; New varieties; Oryza sativa; Plant Genetics and Genomics; Plant Pathology; Plant Physiology; Plant Sciences; Population; Research centers; Rice; Tropical environments; Population structure; Allele; Heading date; Selection; Rice
• ISSN: 0014-2336; 1573-5060
• DOI: 10.1007/s10681-021-02965-y

The cultivation areas of crops have expanded all over the world into various environmental conditions from their original areas along with human migration after domestication. Here, we demonstrated the genetic changes in the adaptation of rice with early heading date from the tropics in the origin of Asian cultivated rice. Rice populations exhibiting early heading date collected from around the world divided into six genetically distinct clusters, E1–E6, by ddRAD-Seq. In addition, sequence variations identified in genes for heading date with large effects, Grain number, plant height and heading date 7 , Oryza sativa Pseudo-Response Regulator37 , and Days to heading 8 showed lineage-specific distribution among the varieties with early heading date. Numbers of loss-of-function alleles in these genes could correlate with early heading date. Mutations for earlier heading date may split off into new varieties and leading to genetic clusters. We proposed a model for the selection for early heading date among cultivated rice varieties with early heading date.