Characteristics of Dry Matter Production and Yield Components of a High-Yielding Rice Cultivar ‘Hokuriku 193’ and Its Progeny Lines in Nagano, Japan

日本作物学会紀事

article

細井 淳¹  岡村 昌樹²  長田 健二³  小林 伸哉⁴  近藤 始彦⁵  小松 晃⁶  中込 弘二⁷  前田 英郎⁷ 

[1] 長野県農業試験場;農研機構中日本農業研究センター;農研機構西日本農業研究センター;農研機構作物研究部門;名古屋大学;農研機構生物機能利用研究部門;農林水産省技術会議事務局

关键词: Breeding of rice cultivar;    High yield rice;    Nagano Prefecture;    Sink capacity;   

DOI  :  10.1626/jcs.91.315

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Field experiments using a high-yielding rice cultivar ‘Hokuriku 193’ and two progeny lines were conducted across three years in Nagano Prefecture, the highest-yielding area for rice in Japan. The characteristics of growth, dry matter production, yield and yield components were compared at the high yielding level of over 1200 g m–2 for rough brown rice. The two progeny lines of ‘Hokuriku 193’ showed lower shoot dry weight than ‘Hokuriku 193’ owing to growth duration shortened by early heading. The abundance of available carbohydrate for grain filling represented by the sum of stem non-structural carbohydrate at full heading and dry matter increase during grain filling tended to be lower in the two progeny lines. The total grain number was higher in line A than in ‘Hokuriku 193’ while the thousand grain weight was lighter. The sink capacity represented by the product of grain number and weight were similar or slightly smaller. The ratio of filled grain was similar to that of ‘Hokuriku 193’ or slightly lower. The brown rice yield of line A was lower than ‘Hokuriku 193’. On the other hand, the sink capacity of line B was improved by a heavier thousand grain weight with similar grain number. The ratio of filled grain was lower. As a result, brown rice yield of line B was similar to that of ‘Hokuriku 193’ despite shorter growth duration. Given that earlier heading can avoid low temperature during grain filling, line B is a promising line for Nagano prefecture.

【 授权许可】

CC BY