• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2001 Fiscal Year Final Research Report Summary

Studies on the Characteristics of Differentiation and Degeneration of Spikelets and Grain-filling in High-yielding Rice Cultivars with Large Panicles

Research Project

Project/Area Number 11660018
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 作物学
Research InstitutionKochi University

Principal Investigator

YAMAMOTO Yoshinori  Kochi University, Faculty of Agriculture, Professor, 農学部, 教授 (00093956)

Co-Investigator(Kenkyū-buntansha) MIYAZAKI Akira  Kochi University, Faculty of Agriculture, Assistant, 農学部, 助手 (00304668)
YOSHIDA Tetsushi  Kochi University, Faculty of Agriculture, Professor, 農学部, 教授 (10145112)
Project Period (FY) 1999 – 2001
KeywordsDegenerated spikelet / Differentiated spikelet / Environmental factors / Grain filling / Large panicle cultivar / Rice / Sink capacity / Surviving spikelet
Research Abstract

This study was conducted to clarify the characteristics of the differentiation and degeneration of spikelets and the grain-filling in high-yielding rice cultivars with large panicles (LP-HYC) bred in China, Korea, the Philippines and other countries in recent years. The results were summarized as follows ;
1. The number of differentiated and degenerated spikelets, and the percentage of degenerated spikelets varied considerably among LP-HYCs, but the number of degenerated spikelets was much larger in the differentiated spikelets on the secondary rachis-branch (SB) than those on the primary rachis-branch of panicle (PB). The major part of degenerated spikelets on SB was derived from the degenerated SBs on the surviving PB.
2. Nitrogen top-dressing at tillering stage to LP-HYCs increased the number of differentiated spikelets per panicle as well as the panicle number, but greater increase in the percentage of degenerated spikelets at the same time decreased the number of surviving spikelets.
3. Nitrogen, phosphorous and potassium application at 40-20days before heading increased the number of surviving spikelets due to the increase in differentiation and the decrease in degeneration of spikelets in LP-HYCs. The heavy shading and high-day and/or night temperature during 15 days before heading increased the percentage of degenerated spikelets. The percentage of degenerated spikelets decreased with the increase of shoot dry weight per stem (SDW) and SDW per differentiated spikelets at heading.
4. Contribution ratio of the stored carbohydrate in the culm and leaf sheath at heading and the assimilated carbohydrate after heading to the grain-filling varied so much among cultivars belonging to LP-HYC and by the cultivated conditions.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 姚 友礼: "中国産多収性水稲品種の穎花分化および退化に及ぼす窒素追肥の影響"日本作物学会四国支部紀事. 36. 78-79 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yao Youli: "Response of differentiated and regenerated spikelets to top-dressing, shading and day/night temperature treatments in rice cultivars with large panicle"Soil Science and Plant Nutrition. 46. 631-641 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yao Youli: "Macro-element absorption at maturity in relation to grain yield in high-yielding rice cultivars"Soil Science and Plant Nutrition. 46. 815-824 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yao Youli: "Role of nitrogen regulation in sink and source formation of high-yielding rice cultivars"Soil Science and Plant Nutrition. 46. 825-834 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 姚 友礼: "水稲における退化穎花の種類と大きさ"日本作物学会紀事. 69(別2). 14-15 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yao Youli: "Heterosis of number of differentiated, degenerated and surviving spikelets and their relation to the dry matter production in F_1 hybrid of rice"Japanese Journal of Crop Science. 69(別2). 16-17 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tahmid Hossain Ansari: "Charactertics of spikelet differentiation and degeneration among rice cultivars belongs to different eco-species of rice"Abst. Ann. Meeting, Japan. Soc. Soil Sci. and Plant Nutri.. 47. 110 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yao Youli: "Response of differentiated and regenerated spikelets to top-dressing, shading and day/night temperature treatments in rice cultivars with large panicle"Soil Science and Plant Nutrition. 46(3). 631-641 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yao Youli: "Macro-element absorption at maturity in relation to grain yield in high-yielding rice cultivars"Soil Science and Plant Nutrition. 46(4). 815-824 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yao Youli: "Role of nitrogen regulation in sink and source formation of high-yielding rice cultivars"Soil Science and Plant Nutrition. 46(4). 825-834 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yao Youli: "Effects of nitrogen top-dressing on the differentiation and degeneration of spikelets in Chinese high-yielding rice cultivars"Shikoku Journal of Crop Science. 36. 78-79 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yao Youli: "Types and sizes of degenerated spikelets in rice"Japanese Journal of Crop Science. 69(Extra issue 2). 14-15 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yao Youli: "Heterosis of number of differentiated, degenerated and surviving spikelets and their relation to the dry matter production in F_1 hybrid of rice"Japanese Journal of Crop Science. 69(Extra issue 2). 16-17 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tahmid Hossain Ansari: "Charactertics of spikelet differentiation and degeneration among rice cultivars belongs to different eco-species of rice"Abst. Ann. Meeting, Japan. Soc. Soil Sci. and Plant Nutri.. 47. 110 (2001)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2003-09-17  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi