论文部分内容阅读
利用压力室结合水通道蛋白抑制剂氯化汞 HgCl2 检测了不同苗龄 15d、25d和35d 向日葵根系水通道的活性,结果显示此生长期间根系导水率保持相对恒定,但0.1mmol/L氯化汞使所有苗龄根系的水流速率和根系导水率迅速降低,而降幅随根龄的增大而增大,表明向日葵根存在调节水分进入根系的水通道蛋白,其活性随根龄的增大而提高,质外体水流随根龄的增大而减小.结论是:在根系生长过程中,细胞到细胞途径水通道蛋白活性的提高可以补偿由于质外体途径导水度降低所致根系导水率的降低,从而维持根系导水率的相对稳定.
The water channel activity of sunflower roots at different seedling ages of 15, 25 and 35 days was detected by using pressure chamber combined with HgCl2, an aquaporin inhibitor. The results showed that the root hydraulic conductivity remained relatively constant during this growth period, but 0.1 mmol / L chlorination Mercury rapidly decreased the water flow rate and root hydraulic conductivity of all seedling roots, and the decrease increased with the increase of root age, indicating that there is water channel protein in sunflower root that regulates the water entering the root system and its activity increases with root age While the increase of apoplast water flow decreased with the increase of root age.Conclusion: The increase of aquaporin activity from cell to cell in the process of root growth can compensate for the decrease of root conductance Reduce the hydraulic conductivity, so as to maintain the relative stability of the root hydraulic conductivity.