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For the purpose of breeding documentation, researchers and breeders kept handwritten records of the breeding history, including parental information and breeding methods. The cultivars were used again as parents for further breeding, and modern cultivars of rice have a wide range of alleles from many generations of parents and ancestors. To understand such a breeding history, it is necessary to ask around for relevant information, which is then usually documented in Excel or Word by multiple breeders or breeding institutes. Here, we constructed RicePedigree, which contains the breeding history of rice based on the documents provided by the Rural Development Administration (RDA) in Korea. We devised a simple method for collecting a breeding history and storing it in a database. RicePedigree is a web-based application on the database that facilitates researchers' and breeders' utilization of the breeding history of rice. Based on the query cultivar name, it will return a hierarchical tree of breeding histories and a list of cultivars and breeding lines that contain query cultivars in their breeding histories. This app would be a good way to review and keep track of information about current and future cultivars. [ABSTRACT FROM AUTHOR]

ABSTRACT Understanding the complex genetic mechanisms controlling rice heading is crucial for rice breeding that aims to promote heading while minimizing adverse impacts on other agronomic traits. However, the allelic variations of major heading date genes in Korean rice cultivars and their effects on key agronomic traits remain unclear. Therefore, we catalogued the allele types of four major heading date genes (Hd1, OsPRR37, Ghd7 and DTH8) in 292 Korean commercial rice cultivars and investigated their individual and combined effects on major agronomic traits over 4 years under natural long‐day conditions. Our study showed that non‐functional hd1 allele have been extensively adopted in developing early maturing cultivars, whereas the alleles associated with early heading in OsPRR37, Ghd7 and DTH8 and their combinations have been rarely used in Korean rice breeding programmes. Alleles within the same functional group exhibited distinct effects on major agronomic traits, highlighting the need for more precise evaluations under isogenic backgrounds. Our study provides useful insights for breeding early maturing rice cultivars that maintain high yield by exploring under‐utilized alleles of heading date genes and their combinations. [ABSTRACT FROM AUTHOR]