摘要
在群体水培条件下,测定特青/LemontF2无性系群体140个株系的氮素吸收利用性状,并用聚类法按库容量大小将群体分为6种类型,研究不同库容量类型水稻在氮素吸收及利用上的差异。结果表明:①抽穗期稻株的含氮率随库容量增大而提高,成熟期的含氮率则随库容量的增大而降低。②随库容量的增大,稻株抽穗期及成熟期的吸氮量均显著提高,且抽穗后的吸氮量随库容量增大而增加。③库容量对抽穗期氮素在不同器官的分配比例无明显影响,但随库容量的增大,成熟期氮素在根、茎、叶中的分配比例明显降低,在穗部的分配比例则明显增加。④随库容量的增大,氮素的物质生产效率、籽粒生产效率及氮素收获指数均显著提高。
In this study, a F_2 asexual population including 140 lines derived from Teqing×Lemont was solution-cultured to investigate the effect of sink potential on nitrogen uptake and utilization in rice. The tested lines were clustered into 6 types by sink potentials, and the differences of nitrogen uptake and utilization in different types were analyzed. Results showed that: ① Nitrogen concentration (NC) in rice plant was not significantly affected by sink potential, but there existed the trend that NC increased at heading but decreased at maturity, as sink potential increased.② Larger sink potential significantly enhanced nitrogen uptake before or after heading. ③ The distribution percentages of nitrogen in different parts of rice plant at heading was not closely related to sink potential but as sink potential increased, nitrogen distribution in stalk and leaf reduced significantly while that in panicle increased. ④ Close relationship between nitrogen use efficiency and sink potential was found in this study. Lager sink potential significantly enhanced nitrogen use efficiency for biomass production and for grain output and also increased nitrogen harvest index.
出处
《扬州大学学报（农业与生命科学版）》
CAS
CSCD
2004年第1期41-45,共5页
Journal of Yangzhou University：Agricultural and Life Science Edition
基金
江苏省高校自然科学基金资助项目(00KJB210006)
扬州大学高层次人才科研启动基金
关键词
水稻
库容量
氮素
吸收利用
rice
sink potential
nitrogen
uptake and utilization
