Ecophysiological Traits and Genetic Analysis of Yield and Ripening in High-Yielding Semi-Dwarf Indica Rice Varieties

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X
40-04-03.pdf507.38 KB

Experiments were conducted to examine the ecophysiological traits of yield and ripening and the genetic backgrounds of these traits in high-yielding semi-dwarf indica rice. Field experiments were performed over four years to examine the yield and growth characteristics of these traits. A large sink size with large numbers of spikelets per panicle and a high ripening ability in the background of a large sink size were found to be two of the major ecophysiological traits that enhance the yield of semidwarf indica. High dry matter productivity after heading was suggested to be linked to a high ripening ability. To determine the genetic backgrounds that control these traits, quantitative trait locus (QTL) analysis was conducted using two different semi-dwarf indica/japonica inbred lines: recombinant inbred lines of Milyang23 (semi-dwarf indica)/Akihikari (japonica), and back-crossed inbred lines of Sasanishiki (japonica)/Habataki (semi-dwarf indica)//Sasanishiki///Sasanishiki. QTLs for larger sink size, higher ripening ability, higher dry matter production, and larger nonstructural carbohydrate (NSC) reserves in leaf sheaths and culms at heading within semi-dwarf indica alleles were detected. The effects of these QTLs probably combine to express the large sink size and high ripening ability traits, resulting in the high yields of the semi-dwarf indica rice varieties.

作成者 NAGATA Kenji

dry matter production

nonstructural carbohydrate (NSC)

quantitative trait locus (QTL)

sink size

公開者 Japan International Research Center for Agricultural Sciences
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 307
終了ページ 316
DOI 10.6090/jarq.40.307
権利 Japan International Research Center for Agricultural Sciences
言語 eng