Genetic architecture of variation in heading date among Asian rice accessions

• DOI: 10.1186/s12870-015-0501-x
• Publication Date: 2015-05-07T16:35:53Z
• Authors: Kiyosumi Hori; Yasunori Nonoue; Nozomi Ono; Taeko Shibaya; Kaworu Ebana; Kazuki Matsubara; Eri Ogiso-Tanaka; Takanari Tanabata; Kazuhiko Sugimoto; Fumio Taguchi-Shi...; Jun-ichi Yonemaru; Ritsuko Mizobuchi; Yusaku Uga; Atsunori Fukuda; Tadamasa Ueda; Shin-ichi Yamamoto; Utako Yamanouchi; Toshiyuki Takai; Takashi Ikka; Katsuhiko Kondo; Tomoki Hoshino; Eiji Yamamoto; Shunsuke Adachi; Hideki Nagasaki; Ayahiko Shomura; Takehiko Shimizu; Izumi Kono; Sachie Ito; Tatsumi Mizubayashi; Noriyuki Kitazawa; Kazufumi Nagata; Tsuyu Ando; Shuichi Fukuoka; Toshio Yamamoto; Masahiro Yano
• Keywords: Genetic architecture

Heading date, a crucial factor determining regional and seasonal adaptation in rice (Oryza sativa L.), has been major selection target breeding programs. Although considerable progress made our understanding of the molecular regulation heading date during last two decades, previously isolated genes identified quantitative trait loci (QTLs) cannot fully explain natural variation for diverse accessions. To genetically dissect naturally occurring we collected QTLs advanced-backcross populations derived from multiple crosses japonica accession Koshihikari (as common parental line) with 11 accessions (5 indica, 3 aus, japonica) that originate various regions Asia. QTL analyses over 14,000 backcrossed individuals revealed 255 distributed widely across genome. Among detected QTLs, 128 corresponded to genomic positions by previous studies, such as Hd1, Hd6, Hd3a, Ghd7, DTH8, RFT1. The other 127 were different chromosomal than genes. Our results indicate progeny allowed us detect confirm relatively small additive effects, could result combinations large- small-effect QTLs. We also found differences genetic architecture (flowering time) among maize, Arabidopsis, rice.