Sterility of Thermo-Sensitive Genic Male Sterile Line, Heterosis for Grain Yield and Related Characters in F1 Hybrid Rice (Oryza sativa L.)

• Pham Cuong Van

  United Graduate School of Agricultural Sciences, Kagoshima University

• Murayama Seiichi

  Faculty of Agriculture, University of the Ryukyus

• Ishimine Yukio

  Faculty of Agriculture, University of the Ryukyus

• Kawamitsu Yoshinobu

  Faculty of Agriculture, University of the Ryukyus

• Motomura Keiji

  Faculty of Agriculture, University of the Ryukyus

• Tsuzuki Eiji

  Faculty of Agriculture, Miyazaki University

Bibliographic Information

Other Title

• Sterility of Thermo-Sensitive Genic Male Sterile Line, Heterosis for Grain Yield and Related Characters in F₁ Hybrid Rice (<i>Oryza sativa</i> L.)

Abstract

The thermo-sensitive genic male sterile (TGMS) T29^s line was sterile when exposed to daily mean temperatures of 24.1°C or above during the critical stage (from 15 to 11 days before heading). It was completely sterile for both pollen and spikelet when the plant headed from June 16 to November 7 in Okinawa, because the temperature exceeded 24.1°C. The heterosis of the F₁ hybrids between the T29^s line and seven indica cultivars was examined. Most of the F₁ hybrids showed positive heterosis over the male parent for grain yield per plant and the number of spikelets per panicle, and one of them manifested heterosis for grain yield over a F₁ hybrid from a cytoplasmic male sterile (CMS) line. Dry matter accumulation per plant at the panicle initiation stage in most F₁ hybrids was higher than that in the respective male parent or mid-parent, and it was correlated with a larger number of tillers and leaf area per plant. All F₁ hybrids produced a larger number of panicles per plant than their respective male parent. Positive heterosis over the male parent for the number of filled grains per panicle, 1000-grain weight and harvest index was obtained in several F₁ hybrids. A positive correlation was found between grain yield and the dry matter accumulation per plant in F₁ hybrids. Both the larger number of panicles per plant and the larger number of spikelets per panicle were more important for the positive heterosis for grain yield in F₁ hybrids rather than the higher 1000-grain weight. Among the yield attributes, a larger number of filled grains per panicle mainly contributed to a higher grain yield of F₁ hybrids.

Journal

• Plant Production Science

  Plant Production Science 7 (1), 22-29, 2004

  CROP SCIENCE SOCIETY OF JAPAN

Keywords

• Dry matter
• F<SUB>1</SUB> hybrid
• Grain yield
• Heterosis
• Sterility

Details

• CRID: 1390001204466742016
• NII Article ID: 110001720506
• NII Book ID: AA11162156
• DOI: 10.1626/pps.7.22
• ISSN: 13491008
• ISSN: 1343943X
• Web Site: http://www.tandfonline.com/doi/pdf/10.1626/pps.7.22
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed