水稲における登熟性の品種間差に関する研究

日本作物学会紀事

劉 建¹  塩津 文隆¹  楠谷 彰人²  豊田 正範² 

[1] 愛媛大学大学院連合農学研究科;香川大学農学部

关键词: Paddy rice;    水稲;    Percentage of ripened grains;    登熟歩合;    Ripening ability;    登熟性;    Specific gravity of winnowed rough rice;    精籾比重;    Varietal difference;    品種間差;    Yield capacity;    収量キャパシティ;    Yield contents;    収量内容物;   

DOI  :  10.1626/jcs.75.492

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The percentage of ripened grains (R) and specific gravity of winnowed rough rice (S) were compared among 25 rice varieties to analyze the varietal differences of ripening ability. The relationship between the R (Y axis) and the accumulated average air temperature during the ripening period T (X axis) was shown by the following formula :     Y=00—a · exp (—b · X) The constant b and the intercept of X axis were different among varieties. The constant b×105 (ripening index, RI) showed a significant positive correlation with R, and the intercept of X axis (starting temperature of ripening, ∑Ts) showed a significant negative correlation with S. Yield content was shown as the sum of reserve carbohydrate (C) and dry matter produced after heading (ΔW) ,and yield capacity as the product of the number of rough rice (N) and volume of winnowed rough rice (V). Then, the correlation of (C+ΔW) /NV with RI and ∑Ts was examined. (C+ΔW) /NV showed a significant positive correlation with RI. The variety with a large C value has a tendency to have a low ∑Ts. These results imply that the cultivar with a high yield content / yield capacity ratio has a higher percentage of ripened grains because its ripening index is high. Also the cultivar with massive reserve carbohydrate was considered to start ripening earlier increasing the specific gravity of winnowed rough rice.

【 授权许可】

Unknown