高等植物光合同化物的运输与分配  

Transport and Partitioning of Photoassimilate in Higher Plant

作　　者：龚月桦[1] 高俊凤[1] 

机构地区：[1]西北农业大学基础科学系,陕西杨陵712100

出　　处：《西北植物学报》1999年第3期564-570,共7页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金

摘　　要：高等植物光合同化物的运输受维管束发育状况影响较大，有时会限制产量。而同化物在各库器官间的分配主要决定于库本身的特性，它常用库强度和优先权来描述。库强度是库容量和库活力的乘积，库容量用细胞数目来度量，而库活力常用相对生长速度来度量。近年来人们也用酶活性来度量库活力或库强度。而库的优先权描述的是各库器官需求同化物的优先次序，种子被认为是优先权最高的库。同化物的运输分配不仅决定于植物本身源、流、库的特性，而且还受矿质营养、水分状况、温度、光照、 Ｃ Ｏ２ 浓度、激素等因素的影响和调节。he transport of photoassimilate in higher plants was mainly affected by the development of vascular bundle, sometime limiting crop production,and the distribution of assimilate among sink organs was mainly determined by the characteristics of sink itself. It is generally described with sink strength and sink priority. Sink strength was defined as the product of sink size and sink activity.sink size was generally determined by cell numbers, and sink activity was determined by the relative sink growth rate. In recent years, sink activity or sink strength was described by enzyme activity. But the sink priority described the priority rank order of competetion for photosynthate between alternative sinks. Seeds had been described as high priority sinks. The transport and partitioning of photoassimilate were not only determined by the characteristics of source.sink and flux of plant itself, but also affected and regulated by mineral nutrition, water status,temperature, light, CO 2 concentration, phytohormones, etc.

关 键 词：光合同化物 运输 分配 高等植物 

分 类 号：Q949.405[生物学—植物学]