Ecophysiological and genetic studies on drought response index in cereal crops

2014 Fiscal Year Final Research Report

• Project/Area Number: 23380011
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Crop production science
• Research Institution: The University of Tokyo
• Principal Investigator: Kamoshita Akihiko 東京大学, アジア生物資源環境研究センター, 准教授 (10323487)
• Co-Investigator(Kenkyū-buntansha): 高野 哲夫 東京大学, アジア生物資源環境研究センター, 教授 (30183057) ; 根本 圭介 東京大学, 農学生命科学研究科, 教授 (40211461)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: ストレス / 生態学 / 遺伝学 / 植物 / 環境 / 耐乾性

Outline of Final Research Achievements

Drought response index (DRI) of rice (Oryza sativa L.) was quantified by using various varieties, 3 mapping populations, and near-isogenic lines of Koshihikari and IR64 with heading date and root trait genes/QTLs to dissect its physiological and genetic mechanisms. In the rice variety experiments, DRI was positively related with harvest index, fertility and biomass production under drought treatment and negatively with percentage of infertile panicles, delay in heading, and reduction in plant height. In the mapping population experiments, QTLs for DRI were detected in RM6911-RM6379 in chromosome 2, around RM5953 in chromosome 4, and 2 loci in chromosome 8. Epistasis and QTL by environment interaction for DRI were significant. In the near-isogenic line experiments, DRI increased by the introgression of DEEPER ROOTING 1, a gene to modify root growth angle toward steeper in response to gravity, and Stele Transversal Area 1, a QTL to enlarge transversal area of stele.

Free Research Field

作物栽培学