The Influence of Growing Temperatures on Activity and Structure of Tomato Roots Hydroponically Grown in Wet Atomosphere or in Solution
The Influence of Growing Temperatures on Activity and Structure of Tomato Roots Hydroponically Grown in Wet Atomosphere or in Solution
复制标题
生长温度对湿气或溶液水培番茄根系活性和结构的影响
DOI：
10.2503/jjshs.71.683
复制
发表时间：
2002
影响因子：
--
通讯作者：
J. Tatsumi
中科院分区：
文献类型：
--
作者：
Y. Nakano;Shin;K. Okano;J. Tatsumi
番茄幼苗在湿片培养（WSC）中生长，其中根在湿大气中发育，或在深流技术（DFT）中生长，其中根浸没在溶液中。它们在保持恒定15、25和35°C的生长室中生长。通过比较根系活力和根系结构，评价了水分胁迫下和水分胁迫下根系对高温和低温的适应性。DFT营养液中的溶解氧高于植物正常所需。在所有温度下，WSC中的番茄植株比DFT中的番茄植株生长得更大。在15°C和35°C下，WSC的伤流率均高于DFT，单位干重的根系呼吸速率在所有温度下均高于WSC。在15°C和35°C下，WSC中的根系具有比DFT中更多的一级分枝和更高的投影面积;在25°C下，两种系统中的根系生长相似。在15°C下，水分胁迫下根系的分形维数（描述根系形态的指标）高于水分胁迫下的分形维数。这些结果表明，在潮湿的大气中的根将更容易适应高温或低温比那些在溶液中。
Tomato seedlings were grown in a Wet-sheet culture (WSC), where roots developed in the wet atomosphere, or in a Deep flow technique (DFT), where roots were submerged in the solution. They were grown in growth chambers kept at a constant 15, 25, and 35°C. The adaptability of the root systems in the WSC and DFT to high or low temperature was evaluated by comparing the root activity and structure of the systems. Dissolved oxygen in the nutrient solution of DFT was above that normally required for the plants. At all temperatures, tomato plants in WSC grew larger than did those in DFT. The bleeding rate of xylem sap on cut stem was higher in WSC than in DFT at 15°C and 35°C, the root respiration rate per dry weight was higher in DFT than in WSC at all temperatures. The root systems in WSC had more first order laterals and higher projected areas than had in DFT at 15°C and 35°C ; root growth in both systems were similar at 25°C. The fractal dimensions of root systems, known as an index for describing root system morphology, were higher in WSC than in DFT at 15°C. These results indicate that roots in the wet atomosphere would adapt more readily to high or low temperatures than did those in the solution.