摘要
应用15N示踪技术研究了水稻不同生育期吸收的15N在各器官中的分配,以及后期植物组织中的挥发损失。结果发现,水稻在分蘖期吸收的氮量少于在幼穗分化期吸收的氮量;在分蘖期吸收的15N,标记结束时氮素主要分配于水稻的叶片中,至成熟期15N有39%转运至水稻子粒中;水稻在幼穗分化期吸收的15N,标记结束时氮素主要分配在水稻茎和叶鞘中,至成熟期15N有46%转运至水稻的子粒中;水稻在分蘖期和幼穗分化期吸收的氮素在后期可以通过植株组织挥发损失,至成熟期损失的比例分别达16 7%和13 4%。
To determine the nitrogen uptake, distribution and N losses from plant tissues at various growing stage by rice plant, solution culture experiments using ()^(15)N tracer technique was conducted at IRRI in Philippines. The results showed that the total nitrogen uptake at panicle initiation (PI) was significantly greater than that at mid-tillering(MT) stage; (()^(15)N) was mostly distributed to rice leaves at MT, and only 39% of ()^(15)N which being absorbed at MT was transmitted to grains at maturity; ()^(15)N was mostly distributed to stems and leaf-sheathes at PI, and 46% of ()^(15)N uptake at PI was transmitted to grains at maturity; According to the ()^(15)N balance at maturity, it was found that the losses of nitrogen from plant tissues were 16.7% and 13.4% while ()^(15)N absorbed at MT and at PI separately, in the duration from ()^(15)N labeling to maturation.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2004年第6期579-583,共5页
Journal of Plant Nutrition and Fertilizers
基金
国际水稻研究所RTOP项目
国家自然基金项目(30210103901)资助。
关键词
水稻
^15N示踪技术
吸收分配
氮素挥发损失
rice
^(15)N tracer technique
uptake and distribution
losses of nitrogen.