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2001 Fiscal Year Final Research Report Summary

Basic Study on Super Panicle Weight Type Varieties in Rice

Research Project

Project/Area Number 11695079
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
KeywordsGrain filling / Large panicle cultivar / Rice / Root activity / Sink capacity / Spikelet / Vascular bundle / Yielding ability
Research Abstract

This study was carried out to clarify the characteristics of determining processes of number of spikelets, sink capacity and grain-filling in super panicle weight type (SPWT) varieties in rice. The results obtained were summarized as follows ;
1. The high yielding semidwarf and intermediate culmed indica SPWT varieties had higher sink capacity due to higher both components, i.e., number of spikelets per m^2 and 1 grain volume (weight) and good transportation system of carbohydrates from the vegetative organs to the panicle.
2. The final grain weight at the different positions in a panicle was mainly determined by the grain-filling rate compared with the grain filling period, irrespective of large differences in grain size among varieties including SPWT.
3. With increasing amount of nitrogen application at various stage from transplanting to heading decreased the hull size of SPWT varieties and resulted in lighter grain weight. The unhulled grains with heavier specific weight showed heavier grain weight, and the grain weight closely and positively associated with the volume of brown rice which was mainly related to the thickness.
4. The percentage of ripened grains and 1000-grain weight of a SPWT variety were strongly and positively correlated with the root activity (α -naphthylamine oxidizing activity) per grain during grain-filling period, and the promotion of these characters with increasing the root activity were greater in the inferior spikelets located on the lower part of a panicle.

  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] Yao Youli: "Ripening characteristics of Chinese newly bred high-yielding rice cultivars in comparison with Japanese cultivar"Shikoku Journal of Crop Science. 36. 80-81 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 姚 友礼: "水稲の籾比重と玄米形質との関係"日本作物学会紀事. 69. 54-60 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 新田洋司: "水稲の穂首節間を走向する大維管束の種類と数および横断面積の品種間比較"日本作物学会紀事. 69. 61-68 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山本由徳: "草型を異にするインド型および日本型水稲品種のシンク容量とその構成要素の比較"日本作物学会紀事. 70(別2). 41-42 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yao Youli: "Ripening characteristics of Chinese newly bred high-yielding rice cultivars in comparison with Japanese cultivar"Shikoku Journal of Crop Science. 36. 80-81 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yao Youli: "Relationship between the characters of hull, brown rice and paddy grain of different specific gravity among different cultivars"Japanese Journal of Crop Science. 69(1). 54-60 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nitta Youji: "Varietal differences in the number and cross area of large vascular bundle at the neck internode of rice"Japanese Journal of Crop Science. 69(1). 61-68 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yao Youli: "Relationships between characters of hull, brown rice and paddy grain with different specific gravity among different cultivars"Japanese Journal of Crop Science. 68(Extra issue 2). 216-217 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yamamoto Yoshinori: "Comparison of sink capacity and its components in japonica and indica rice cultivars with different plant types"Japanese Journal of Crop Science. 70(Extra and issue 2). 41-42 (2001)

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

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Published: 2003-09-17  

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