培地の窒素濃度が異なる条件で大気飽差が日本晴(日本型水稲)とIR24号(インド型水稲)の生長・乾物生産に及ぼす影響

日本作物学会紀事

西岡 秀明¹  稲村 達也³  平井 源一²  山本 尚明¹  奥村 俊勝¹ 

[1] 近畿大学大学院農学研究科;大阪総合保育大学;京都大学大学院農学研究科

关键词: Absorption of nitrogen;    窒素増加量;    Atmospheric saturation deficiency;    大気飽差;    Average leaf area;    平均葉面積;    Dry matter production;    乾物増加量;    Net assimilation rate;    純同化率;    Rice;    水稲;   

DOI  :  10.1626/jcs.77.333

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The effects of nitrogen (N) concentration in the culture solution on the growth and dry matter production (DMP) were examined under large (14—17hPa) and small (5—8hPa) atmospheric saturation deficiency (ASD) in Japonica-type Rice Nipponbare and Indica-type Rice IR24. In Nipponbare, DMP was significantly lower in the solution with 8.0 ppm N than in the solution with 24.0 ppm N under a large ASD condition but not under a small ASD condition. In IR24, on the other hand, DMP did not differ significantly between the plants in the solutions with 24.0 and 8.0 ppm N under both ASD conditions. DMP was lower in the solution with 2.7 ppm N than in the solution with 8.0 ppm N in both cultivars under both ASD conditions, due to nitrogen deficiency. The contribution of net assimilation rate (NAR) to DMP was greater in Nipponbare than in IR24, and that of average leaf area (average LA) relative to that of NAR was greater in IR24 than in Nipponbare. In Nipponbare, the N content decreased as the N concentration in the culture solution decreased. NAR and average LA also greatly decreased accompanied with the decrease in N content under a large ASD condition, but only slightly under a small ASD condition. In IR24, on the other hand, the N content did not differ between the plants cultured in the solution with 24.0 and 8.0 ppm solutions, due to the high N absorption ability of roots, and the difference in NAR and average LA between the plants in the two solutions was slight under both ASD conditions. These mechanisms may be responsible for the difference between Nipponbare and IR24 in the response of DMP to ASD mentioned above.

【 授权许可】

Unknown