Carballeira A, Díaz S, Vázquez MD, López J
Ecología, Facultad de Biología, Universidad de Santiago de Compostela, 15706 Santiago de Compostela, Spain
Arch Environ Contam Toxicol. 1998 May;34(4):343-9. doi: 10.1007/s002449900328.
The physiological responses of the aquatic bryophyte Fontinalis antipyretica Hedw. to high temperatures, ranging from 16 degreesC (control) to 34 degreesC, were investigated experimentally. Plant samples were maintained at the temperature under study for up to 25 days with regular determination of physiological variables (pigment ratio and photosynthetic and respiratory rates). Physiological responses to temperature did not differ significantly between mosses collected from a normal river site and from a river site with abnormally high temperature due to input from a hot spring. Simple curve-fitting procedures and summary statistics analogous to those used in toxicological research were employed to compare responses as revealed by the different physiological variables. In a second series of experiments, the capacity of F. antipyretica to recover from high-temperature stress was investigated by maintaining samples at 30 degreesC for 2, 4, or 10 days, then transferring the samples to normal conditions (16 degreesC) for 40 days. Physiological variables were again monitored at regular intervals throughout both phases of the experiment. In general, good recovery was observed even after exposure to high temperatures for 10 days. The results of these assays allow quantification of the relationship between a pigment ratio and net photosynthesis rate.
对水生苔藓植物扭口藓（Fontinalis antipyretica Hedw.）在16摄氏度（对照）至34摄氏度高温范围内的生理反应进行了实验研究。将植物样本在研究温度下保持长达25天，并定期测定生理变量（色素比率以及光合速率和呼吸速率）。从正常河流站点采集的苔藓与从因温泉输入而温度异常高的河流站点采集的苔藓相比，其对温度的生理反应没有显著差异。采用了类似于毒理学研究中使用的简单曲线拟合程序和汇总统计数据，以比较不同生理变量所揭示的反应。在第二系列实验中，通过将样本在30摄氏度下保持2天、4天或10天，然后将样本转移到正常条件（16摄氏度）下40天，研究了扭口藓从高温胁迫中恢复的能力。在实验的两个阶段中，均定期监测生理变量。总体而言，即使在高温暴露10天后仍观察到良好的恢复情况。这些测定结果能够对色素比率与净光合速率之间的关系进行量化。
