双标记技术研究韧皮部同化物和水的相对运动  

A Study on the Relative Movement Betweeen the Photosynthate and Water in Phloem With the Double Tracer Technology

作　　者：刘新[1] 葛才林[2] 罗时石[2] 龚荐[2] 

机构地区：[1]扬州大学理学院,扬州225002 [2]扬州大学农学院,扬州225002

出　　处：《江西农业大学学报》2000年第3期376-380,共5页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家自然科学基金青年基金项目资助!(3940 0 0 1 1 )

摘　　要：采用同位素双标记技术 ,通过研究各种处理的棉花果枝韧皮部14 C -同化物和3 H -H2 O的运输情况 ,计算并比较二者的加权速率平均值 ,说明了韧皮部同化物和水存在一定程度的相对运动 ,这种相对运动可能是由于3 H -H2 O和筛管外细胞及胞间隙中的大量存在的非标记水发生侧向交换的结果 。By using the doubie tracer, the situation of 14 C-photosyathate and 3H-water transportation in phloem of the cotton stem in different treatments was studied. Calculating and comparing their weighted velocity averages showed that the relative movement existed in phloem, which is possibly due to the lateral exchange between 3H-water and a great amount of pure water in the cells outside sieve tubes and intercellular space. It is not contradict to the theory that the photosynthate transports in phloem by liquid form.

关 键 词：棉花 水 同化物 韧皮部 相对运动 同位素双标记 

分 类 号：S562.01[农业科学—作物学]