Investigation of the effects of the circadian rhythms changes on photosynthesis and yield components

• Project/Area Number: 26870319
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Crop production science; Science in genetics and breeding
• Research Institution: Kyoto University
• Principal Investigator: Saito Hiroki 京都大学, 農学研究科, 助教 (10536238)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: イネ / 概日リズム / 出穂期 / 光合成 / 突然変異

Outline of Final Research Achievements

Circadian rhythms are the subset of biological rhythms with period, defined as the time to complete one cycle of approximately 24 h. In this study, the effect of slight changes of the circadian rhythms on the yield components were investigated. In first, a mutant line (GP8), which harbored a mPing insertion at the exon of OsPRR59 gene, was selected. Next, the measurement of the circadian rhythms based on delayed fluorescence showed some oscillations, however it needs further investigations and improvements to detect distinct rhythmic oscillations. HS276, which harbored a mutant allele at the Ef7 locus and arrhythmic oscillations in the day-time free-running rhythms, showed that the length of panicles, number of primary branches of panicle and secondary branches of panicle were increased compared with the wild type.

Research Products

• [Journal Article] Detection of novel QTLs <i>qDTH4.5</i> and <i>qDTH6.3</i>, which confer late heading under short-day conditions, by SSR marker-based and QTL-seq analysis (2017)
  • Author(s): Eri Ogiso-Tanaka, Tsuyoshi Tanaka, Keisuke Tanaka, Yasunori Nonoue, Takuji Sasaki, Erina Fushimi, Yohei Koide, Yutaka Okumoto, Masahiro Yano, Hiroki Saito
  • Journal Title: Breeding Science Volume: 67 Issue: 2 Pages: 101-109
  • DOI: 10.1270/jsbbs.16096
  • NAID: 130006854986
  • ISSN: 1344-7610, 1347-3735
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] 不感光性早生突然変異系統X61における晩生突然 変異遺伝子ef7による感光性の復帰 (2016)
  • Author(s): 齊藤 大樹, Ayesha Siddika, Kamal Mustafa, 吉 竹 良洋, 横尾 敬行, 伏見 栄利奈, 築山 拓司, 寺石 政義, 奥本 裕
  • Organizer: 日本育種学会 第130回講演会
  • Place of Presentation: 鳥取県、鳥取市、鳥取大学
• [Presentation] The genetic effects with combination of flowering time mutant genes on flowering time and yield components (2014)
  • Author(s): Quan Xu, Hiroki Saito, Ikuo Hirose, Keisuke Katsura, Yoshihiro Yoshitake, Takayuki Yokoo, Takuji Tsukiyama, Masayoshi Teraishi, Takatoshi Tanisaka and Yutaka Okumoto
  • Organizer: 12th International Symposium on Rice Functional Genetics
  • Place of Presentation: Tucson, Arizona, USA
  • Year and Date: 2014-11-16 – 2014-11-19