Department of Plant Physiology, Warsaw University of Life Sciences SGGW, Warsaw, Poland.
OMICS. 2011 Dec;15(12):925-34. doi: 10.1089/omi.2011.0070. Epub 2011 Nov 22.
The photosynthetic activity of two Syrian barley (Hordeum vulgare L.) landraces, Arabi Abiad (A. Abiad) and Arabi Aswad (A. Aswad), grown under low- and high- temperature stresses, were studied by analyzing the measured chlorophyll fluorescence signals. Both the applied stresses influenced photosystem II (PSII) activity. However, the effects depend on the stress type and the duration of its application. Phenomenological parameters were shifted shortly after the application of both stresses, whereas fluorescence ratios and yield values were altered most significantly after 7 days of stress imposition. The earliest changes in PSII activity of both cultivars were observed in the case of high temperature treatment. The maximal quantum efficiency of the photosynthetic apparatus (F(v)/F(M)) did not alter after stress application. Therefore, we could not recommend this parameter for early detection of such stress. In contrast, the results from the present investigation strongly indicate that the most significantly changed chlorophyll a fluorescence parameters could be used as an efficient tool for the early diagnosis of temperature stress in barley.
研究了在低温和高温胁迫下生长的两种叙利亚大麦（Hordeum vulgare L.）地方品种 Arabi Abiad（A. Abiad）和 Arabi Aswad（A. Aswad）的光合活性，通过分析测量的叶绿素荧光信号进行研究。两种胁迫均影响光系统 II（PSII）活性。然而，其影响取决于胁迫的类型及其应用的持续时间。在施加两种胁迫后不久，现象学参数发生了变化，而荧光比和产量值在胁迫施加 7 天后发生了最显著的变化。在高温处理的情况下，观察到两种品种的 PSII 活性的最早变化。在胁迫应用后，光合作用机构的最大量子效率（F(v)/F(M)）没有改变。因此，我们不能推荐该参数用于早期检测这种胁迫。相比之下，本研究的结果强烈表明，叶绿素 a 荧光参数的最显著变化可以用作大麦早期诊断温度胁迫的有效工具。
