Studies on Ripening of Rice Varieties Grown under Low Temperature : III. Influence of dry matter production after heading stage on ripening

Japanese Journal of Crop Science

Akihito KUSUTANI¹ 

关键词: Dry matter production;    稲;    Reserve carbohydrate;    乾物生産;    Rice;    貯蔵炭水化物;    Ripening;    転流;    Translocation;    登熟;   

DOI  :  10.1626/jcs.57.298

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

In this paper, the dry matter accumulation patterns of 13 rice varieties were compared in order to analyze the cause of the varietal differences in ripenig. The relationship between the percentage of fully ripened grains to fertilized grains(Y) and the accumulated average air temperature during the ripening period(X) is shown in the next formula: Y=1-a·exp (-b·X) The constant b was different among varieties. This constant b (ripenig index, RI) correlated significantly with the reserve carbohydrate in the stem and leaf sheath at two weeks after the full heading stage (C) and also with dry matter production from two weeks after the full heading stage to the maturing stage (ΔW). The correlation between RI and the number of grains per square meter (N) was not significant. A higher significant correlation was found between RI and (C+ΔW)/N. RI also showed a significant correlation with the increase in ear dry weight during the ripening period (ΔE)/(C+ΔW). From these facts, it was concluded that RI was a useful index to estimate the ripening ability of different varieties.

【 授权许可】

Unknown