Relation between Characteristics and Rooting Activity of Rice Seedlings (Oryza sativa L.) with Special Reference to Amylase Activity

[摘要] The authors examined the difference in the characteristics of rice seedlings (Oryza sativa L.) grown under different growth conditions, especially the relation between rooting activity and amylase activity. The characteristics ot rice seedlings on 14 days after seeding were judged by the rooting activity test. In the low density and high temperature plot the qualities of seedlings were good: in the upland, 1/2N, 3/2N and low temperature plots qualities were the same as in the control plot, but in the high density, lowland and shaded plots they were poorer than those in the control plot. While on 28 days after seeding, in the low density, upland and low temperature plots the qualities were better than those in the control plot: in the high density, lowland and high temperature plots the qualities were not so good, and in the shaded plot they were even poorer. On 14 days after seeding, rooting activity showed a significant correlation with leaf age, plant length, leaf sheath diameter, leaf dry weight root dry weight and amylase activity. While on 28 days after seeding, rooting activity showed a highly significant correlation with nitrogen content, starch content and amylase activity. Seedlings with higher starch accumulation, that is higher amylase activity, showed better rooting activity, and good quality.

[学科分类] 农业科学（综合）

[关键词] Amylase activity;アミラーゼ活性;Characteristics of Rice Seedling;水稲;Oryza sativa L.;苗の素質;Rooting activity;発根力