Response of the Photosynthesis and Antioxidant Systems to High-Temperature Stress in Euonymus japonicus Seedlings
Response of the Photosynthesis and Antioxidant Systems to High-Temperature Stress in Euonymus japonicus Seedlings
复制标题
大叶黄杨幼苗光合作用和抗氧化系统对高温胁迫的响应
DOI：
10.1093/forestscience/56.2.172
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发表时间：
2010-04
期刊：
影响因子：
1.4
通讯作者：
Wang, Jun-Gang
中科院分区：
文献类型：
--
作者：
Jin, Song-Heng;Li, Xue-Qin;Zheng, Bing-Song;Wang, Jun-Gang
为了揭示光合作用在高温下的适应机制，对亚热带林木大叶黄杨幼苗的核酮糖-1，5-二磷酸羧化酶/加氧酶活性、光合作用电子传递系统和抗氧化系统的变化进行了研究。与对照相比，高温处理的幼苗RuBisco活性和光系统(PS)II电子传递的量子效率(ΦPS II)降低，而叶绿素(Chl)荧光的能量猝灭(QE)增加。对P700氧化还原变化和PSI耗氧量的分析表明，高温胁迫下，刺参幼苗在PSI周围的循环电子传递速率较高。此外，高温处理提高了幼苗体内的ROS水平、超氧化物歧化酶活性和抗坏血酸过氧化物酶活性。因此，高温胁迫可能启动了以酶为基础的水-水循环，高温诱导的ROS可能在高温条件下发挥重要作用。在高温条件下，围绕PSI和水-水循环的循环电子传递的增强可能有助于维持跨类囊体的能量势。这种协同防御可能在日本血吸虫细胞对羟色胺的适应中发挥重要作用。
To uncover the adaptive mechanisms of photosynthesis under high temperatures (HTs), changes in the activity of ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco), the photosynthetic electron transport system, and antioxidant system were examined in a subtropical forest tree seedling, Euonymus japonicus. Compared with the control, the activity of rubisco and the quantum yield of photosystem (PS) II electron transport (ΦPSII) decreased in HT-treated seedlings, whereas energy-dependent quenching of chlorophyll (Chl) fluorescence (qE) increased. An analysis of the redox change of P700 and the oxygen uptake by PSI indicated that the cyclic electron transport around PSI operated at high rates in E. japonicus seedlings exposed to HT conditions. Furthermore, the levels of reactive oxygen species (ROS), the activities of superoxide dismutase, and the activities of ascorbate peroxidase were increased in HT-treated seedlings. Therefore, it is likely that an enzyme-based water-water cycle was initiated in E. japonicus seedlings in response to HT stress and that the HT-induced ROS might play an important function in HT conditions. Enhancement of cyclic electron transport around PSI and water-water cycles might help maintain a transthylakoid energy potential under HT conditions. This coordinated defense may play an important role in adaptation of E. japonicus cells to HT.
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影响因子：
4
作者：
D. Weston;W. Bauerle
通讯作者：
D. Weston;W. Bauerle
影响因子：
7.4
作者：
GOMBOS, Z;WADA, H;MURATA, N
通讯作者：
MURATA, N
影响因子：
2.7
作者：
K. Lu;Y. Yang;Y. He;D. Jiang
通讯作者：
K. Lu;Y. Yang;Y. He;D. Jiang
DOI：
10.1562/0031-8655(2000)072
发表时间：
2000-08
期刊：
--
影响因子：
--
作者：
A. Rück;K. Heckelsmiller;R. Kaufmann;N. Grossman;E. Haseroth;N. Akgün
通讯作者：
A. Rück;K. Heckelsmiller;R. Kaufmann;N. Grossman;E. Haseroth;N. Akgün
影响因子：
4.9
作者：
S. Sawada;Makiko Sato;Akihito Kasai;Daisuke Yaochi;Youjiro Kameya;Izumi Matsumoto;M. Kasai
通讯作者：
S. Sawada;Makiko Sato;Akihito Kasai;Daisuke Yaochi;Youjiro Kameya;Izumi Matsumoto;M. Kasai