水稲苗の種類による出穂日の変動と障害型冷害による稔実歩合との関係

日本作物学会紀事

斎藤 満保²  中村 聡²  後藤 雄佐¹ 

[1] 東北大学大学院農学研究科;宮城大学食産業学部

关键词: Cool summer damage;    冷害;    Heading time;    出穂期;    Low-temperature injury;    低温障害;    Middle seedling;    中苗;    Nursling seedling;    乳苗;    Paddy rice;    イネ;    Sterility;    不稔;    Young seedling;    稚苗;   

DOI  :  10.1626/jcs.75.1

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Paddy rice seedlings transplanted at different growth stages in Miyagi prefecture in 2003 were examined for heading date and the percentage of ripening on all stems in each hill in relation to cool summer damage. In that year, the low temperature and insufficient sunshine continued from June for a long period, and floral sterility due to the low temperature occurred frequently. The heading date was earliest in the plants transplanted at the middle-seedling stage (MS plants) followed by those transplanted at the young-seedling stage (YS plants), and those transplanted at the nursling-seedling stage (NS plants), in this order. The heading period was longer than that in normal years, and was 11, 13 and 9 days in the MS, YS and NS plants, respectively. The difference in the 50% heading dates between the MS and YS plants was 4.7 days, and that between the YS and NS plants was 4.2 days. Irrespective of the growth stage of the seedlings at transplanting, the later the heading date within the period from August 10 to August 20, the higher the percentage of ripening on the stem. The percentage of ripening on the stems headed after August 20 was nearly the same. Weight of brown rice per unit area was lower in the MS plants and this was attributed to the sterility caused by the low temperature. We conclude that the damage caused by floral sterility from low temperatures can be mitigated by these seedling types.

【 授权许可】

Unknown