Physiological mechanism on the strong-culm for developing superior lodging resistant rice varieties

• Project/Area Number: 25660014
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Crop production science
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: OOKAWA Taiichiro 東京農工大学, (連合)農学研究科(研究院), 准教授 (80213643)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 水稲 / 倒伏抵抗性 / 強稈 / セルロース / ヘミセルロース / 皮層繊維組織 / リーフスター / 強稈性

Outline of Final Research Achievements

When developing new rice varieties for human food, feed and biofuel, the main goals are to enhance biomass production and lodging resistance. Among the improved varieties, Leaf Star has the highest bending moment at the basal culm at breaking because of its large section modulus, which is an indicator of culm thickness and higher bending stress, and thus, culm stiffness. Thus, Leaf Star has superior resistance to lodging because of its combination of culm thickness and culm stiffness. In this study, we investigated which traits are responsible for strong culm strength using strong-culm variety Leaf Star and its parents. The densities of both cellulose and hemicellulose in Leaf Star were higher than those in Chugoku 117. The cortical fiber tissue in the basal internode was thicker in Leaf Star than in Chugoku 117. The secondary walls of the cortical fiber cells of Leaf Star and Koshihikari were well-developed, whereas many hollow cortical fiber cells were observed in Chugoku 117.

Research Products

• [Journal Article] Isolation of a Novel Lodging Resistance QTL Gene Involved in Strigolactone Signaling and Its Pyramiding with a QTL Gene Involved in Another Mechanism (2015)
  • Author(s): Kenji Yano, Taiichiro Ookawa, Koichiro Aya, Yusuke Ochiai, Tadashi Hirasawa, Takeshi Ebitani, Takeshi Takarada, Masahiro Yano, Toshio Yamamoto, Shuichi Fukuoka, Jianzhong Wu, Tsuyu Ando, Reynante Lacsamana Ordonio, Ko Hirano and Makoto Matsuoka
  • Journal Title: Molecular Plant Volume: 8 Issue: 2 Pages: 303-314
  • DOI: 10.1016/j.molp.2014.10.009
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Increased lodging resistance in long-culm, low-lignin gh2 rice for improved feed and bioenergy production (2014)
  • Author(s): Taiichiro Ookawa, Kazuya Inoue, Makoto Matsuoka, Takeshi Ebitani, Takeshi Takarada, Toshio Yamamoto, Tadamasa Ueda, Tadashi Yokoyama, Chisato Sugiyama, Satoshi Nakaba, Ryo Funada, Hiroshi Kato, Motoki Kanekatsu, Koki Toyota, Takashi Motobayashi, Mehran Vazirzanjani, Seisyu Tojo, Tadashi Hirasawa
  • Journal Title: Scientic Reports Volume: 4 Issue: 1 Pages: 1038-1038
  • DOI: 10.1038/srep06567
  • NAID: 40020309034
  • Peer Reviewed / Open Access
• [Presentation] 水稲の強稈性に関与する太稈および強稈質関連形質の量的形質遺伝子座解析 －リーフスターとコシヒカリの組換え自殖系統を用いて－ (2015)
  • Author(s): 鈴木浩貴、松木美紗、山本敏央、上田忠正、平沢正、大川泰一郎
  • Organizer: 日本作物学会第239 回講演会
  • Place of Presentation: 日本大学（神奈川県藤沢市）
  • Year and Date: 2015-03-27 – 2015-03-28
• [Presentation] 水稲稈の高炭水化物蓄積および強稈質に関わる形質の量的遺伝子座解析 －リーフスターとコシヒカリの組換え自殖系統を用いて－ (2015)
  • Author(s): 松木美紗、鈴木浩貴、山本敏央、上田忠正、大杉立、青木直大、平沢正、大川泰一郎
  • Organizer: 日本作物学会第239 回講演会
  • Place of Presentation: 日本大学（神奈川県藤沢市）
  • Year and Date: 2015-03-27 – 2015-03-28
• [Presentation] 水稲における強稈関連形質の量的形質遺伝子座の特定とその作用機作 (2015)
  • Author(s): 山本一洋、山本敏央、上田忠正、平沢正、大川泰一郎
  • Organizer: 日本作物学会第239 回講演会
  • Place of Presentation: 日本大学（神奈川県藤沢市）
  • Year and Date: 2015-03-27 – 2015-03-28
• [Presentation] コシヒカリ／タカナリ染色体断片置換系統群を用いた水稲の強稈性に関与する量的形質遺伝子座の推定 (2014)
  • Author(s): 青羽遼、山本敏央、平沢正、大川泰一郎
  • Organizer: 日本作物学会第237回講演会
  • Place of Presentation: 千葉大学（千葉県千葉市）
• [Presentation] 水稲の倒伏抵抗性を高める強稈関連形質の遺伝子座の推定―コシヒカリとタカナリの正逆染色体断片置換系統群を用いて― (2013)
  • Author(s): 山本一洋、山本敏央、上田忠正、杉山知里、岡庭侑香、平沢正、大川泰一郎
  • Organizer: 日本作物学会第236 回講演会
  • Place of Presentation: 鹿児島大学（鹿児島県鹿児島市）
• [Presentation] Estimation of the locus for the traits associated with a strong culm, using reciprocal chromosome segment substitution lines derived from the cross between rice varieties, Koshihikari and Takanari (2013)
  • Author(s): Kazuhiro Yamamoto, Toshio Yamamoto, Chisato Sugiyama, Tadashi Hirasawa and Taiichiro Ookawa
  • Organizer: The 7th Rice Genetics Symposium
  • Place of Presentation: Dusit Thani Hotel (Manilla, Philippines)