A near-isogenic rice line carrying a QTL for larger leaf inclination angle yields heavier biomass and grain

Su San Nan Su San, Yosuke Ootsuki, Shunsuke Adachi, Toshio Yamamoto, Tadamasa Ueda, Takanari Tanabata, Takashi Motobayashi, Taiichiro Ookawa, Tadashi Hirasawa

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Manipulating plant architecture is a promising strategy for further improving rice production. The canopy extinction coefficient (k), the most important parameter of canopy architecture, represents the characteristics of light penetration into the canopy, and is determined mainly by the leaf inclination angle. With its erect leaves, the high-yielding indica cultivar ‘Takanari’ has a smaller k during ripening than the elite japonica cultivar ‘Koshihikari’. Using chromosome segment substitution lines derived from a cross between ‘Takanari’ and ‘Koshihikari’ we previously detected a quantitative trait locus (QTL) for leaf inclination angle on a chromosome 3. Here, we tested a near-isogenic line (NIL-3) carrying the ‘Takanari’ allele of a QTL for larger leaf inclination angle on chromosome 3, qLIA3, in the ‘Koshihikari’ genetic background for the effects of qLIA3 on k, dry matter production, and grain yield. NIL-3 had leaves with a larger inclination angle from the full heading through ripening stages and a smaller k at the ripening stage than ‘Koshihikari’. There were no differences in plant height, panicle size, heading date, leaf area index, or individual leaf photosynthesis between NIL-3 and ‘Koshihikari’. Biomass at harvest was significantly greater in NIL-3 than in ‘Koshihikari’ owing to a higher net assimilation rate during ripening, resulting in a higher grain yield. qLIA3 might incorporate a promising gene for improving rice production.

Original languageEnglish
Pages (from-to)131-138
Number of pages8
JournalField Crops Research
Publication statusPublished - Apr 15 2018
Externally publishedYes


  • Canopy extinction coefficient
  • Grain yield
  • Leaf inclination angle
  • Quantitative trait locus
  • Rice

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science


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