胡杨对盐分胁迫的生理响应及耐受机制
Physiological response to salinity stress and tolerance mechanics of Populus euphratica.
作者信息
Zhao Chun Yan, Si Jian Hua, Feng Qi, Deo Ravinesh C, Yu Teng Fei, Li Pei Du
机构信息
Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
出版信息
Environ Monit Assess. 2017 Oct 2;189(11):533. doi: 10.1007/s10661-017-6257-z.
The salinity stress inhibits the growth of Populus euphratica (P. euphratica), and the extent of inhibition tends to increase with a rise of salt concentration while the net photosynthesis rate, stomatal conductance, transpiration rate, and internal CO concentration are seen to decline with increasing salt concentration. Compared with the control group, the percentage decline is found to be about 48.50, 15.72, 42.09, and 48.33%, respectively. Although all chlorophyll fluorescence of P. euphratica exhibits a typical O-J-I-P curve in differently concentrated salt solutions, salinity stress shows a significant influence on the value of J and I step (P < 0.05). However, salinity stress was seen to induce a decrease in variable fluorescence (Fv)/maximal fluorescence value by 2.32, 8.78, 12.80, 12.93, 16.46, and 19.63% treated by 50-, 100-, 150-, 200-, 250-, and 300-mM salt solution compared with the control group, respectively. Salinity stress appeared also to induce a decrease in Fv/minimal fluorescence values by a magnitude of 5.22, 16.02, 18.06, 22.95, 26.34, and 32.19% in P. euphratica treated by 50-, 100-, 150-, 200-, 250-, and 300-mM salt solution relative to the control group, respectively. An increase in the content of malondialdehyde amounted to 4.12, 25.59, 34.60, 68.11, 70.72, and 67.68% in P. euphratica treated by 50-, 100-, 150-, 200-, 250-, and 300-mM salt solution compared to the control group, respectively. In terms of the content of proline, the salinity stress induced an increase by 4.94, 29.49, 53.20, 77.65, 82.46, and 90.68% in P. euphratica treated by 50-, 100-, 150-, 200-, 250-, and 300-mM salt solution, respectively.
盐分胁迫抑制胡杨（胡杨）的生长，抑制程度随盐浓度升高而增加，而净光合速率、气孔导度、蒸腾速率和胞内CO浓度则随盐浓度增加而下降。与对照组相比，下降百分比分别约为48.50%、15.72%、42.09%和48.33%。虽然胡杨在不同浓度盐溶液中的所有叶绿素荧光均呈现典型的O-J-I-P曲线，但盐分胁迫对J和I步的值有显著影响（P<0.05）。然而，与对照组相比，50、100、150、200、250和300 mM盐溶液处理的胡杨可变荧光（Fv）/最大荧光值分别降低了2.32%、8.78%、12.80%、12.93%、16.46%和19.63%。盐分胁迫还使50、100、150、200、250和300 mM盐溶液处理的胡杨Fv/最小荧光值分别相对于对照组降低了5.22%、16.02%、18.06%、22.95%、26.34%和32.19%。与对照组相比，50、100、150、200、250和300 mM盐溶液处理的胡杨丙二醛含量分别增加了4.12%、25.59%、34.60%、68.11%、70.72%和67.68%。就脯氨酸含量而言，50、100、150、200、250和300 mM盐溶液处理的胡杨盐分胁迫分别使其增加了4.94%、29.49%、53.20%、77.65%、82.46%和90.68%。
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