| 摘要: |
| 采用同位素双标记技术 ,在棉花带库离体果枝的韧皮部与木质部基部不分离的情况下 ,韧皮部引入14C-蔗糖溶液 (ρ=50 g/ L ) ,木质部引入3H-H2O并对其液流分子运输速率进行研究。结果表明 ,同化物在韧皮部中以液流形式运输 ,液流中的水主要来源于木质部 ;同化物分子和水分子在韧皮部的运输存在多速率现象。把速率范围均匀等分成若干个速率区间 ,以此为横坐标 ;测量并计算各速率区间对应运输的同化物或水分的相对百分比 Pi,以此为纵坐标 ,可得液流中同化物分子和水分子运输的速率分布曲线。 |
| 关键词: 同化物,韧皮部,液流运输,速率分布曲线,棉花果枝 |
| DOI： |
| 分类号:Q945.17 1 |
| 基金项目:国家自然科学基金青年基金资助项目(39400011) |
|
| Research on the liquid molecular velocity distri-bution graph of cotton fruit branch |
|
LIU Xin 1 GE Cai lin 2 LUO Shi shi 2 MA Fei 2 GONG Jian 2
|
| Abstract: |
| By using the double tracer,the introduction of 14C-sucrose into the phloem of cotton stem and 3H-water into xylem of cotton stem are researched in this experiment.The photosynthate in phloem transports by liquid form and the water of the liquid mainly comes from the xylem.The result shows that the photosynthate and the water from xylem transportation in phloem are closely interrelated.The method for measuring the velocity distribution graph is established when the photosynthate transports along the phloem of cotton stem from source to pool.The transportation velocity of photosynthate and water molecule distributes from zero to the maximum velocity,and their graphic form is similar to that of gas molecule. |
| Key words: photosynthate,xylem,liquid transportation,velocity distribution graph,cotton fruit branch |
