水稲品種ササニシキとハバタキの収量, 乾物生産とこれに関わる生理生態的性質の比較

日本作物学会紀事

二戸 奈央子¹  大川 泰一郎¹  平沢 正¹  浅沼 俊輔¹ 

[1] 東京農工大学大学院農学府

关键词: Dry matter production;    乾物生産;    Photosynthesis;    光合成;    Midday reduction of photosynthesis;    光合成の日中低下;    Root length;    根長;    Harvest index;    収穫指数;    Yield;    収量;    Paddy rice;    水稲;    Resistance to water transport;    水の通導抵抗;   

DOI  :  10.1626/jcs.77.474

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

In the marker-assisted selection for breeding high-yielding rice, the target traits need to be identified and characterized. Habataki, identified as an indica type and high-yielding cultivar, has been employed in the research for analyzing quantitative trait loci (QTL). In this study, we investigated ecophysiological characteristics contributing to the high grain yield of Habataki compared with Sasanishiki (japonica type). Grain yield was 60—120g m-2 higher in Habataki than in Sasanishiki due to a significantly higher harvest index. Habataki showed a higher crop growth rate (CGR) during the period from the booting to the early ripening stages, which might contribute in part to the higher harvest index in Habataki. Habataki had a higher photosynthetic rate in the morning and maintained a higher rate in midday and afternoon, which might be attributed to the higher CGR during early ripening. Habataki had longer roots with larger surface area and, therefore, lower resistance to water transport from root to leaf than Sasanishiki, which might be attributed to the maintenance of higher photosynthetic rate until afternoon. It would be useful for improving grain yield to identify the QTL related to the high photosynthetic rate and water transport capacity of Habataki, and introduce it into the japonica-type rice.

【 授权许可】

Unknown