Wang Biao, Yu Mu-Kui, Sun Hai-Jing, Cheng Xiang-Rong, Shan Qi-Hua, Fang Yan-Ming
College of Forest Resource and Environment, Nanjing Forestry University, Nanjing, China.
Ying Yong Sheng Tai Xue Bao. 2009 Aug;20(8):1817-24.
The photosynthetic characteristics of Quercus acutissima from Feixian, Chuzhou and Wanyuan provenances were investigated under NaCl stress at 5 concentrations. For the three provenances, their leaf chlorophyll a (Chl a) and chlorophyll b (Chl b) contents and net photosynthetic rate (Pn) decreased with increasing salt stress, among which, the maximal decrement of Chl a content was 21.5%-36.1% for Feixian provenance, and 3.5%-19.8% for Wanyuan provenance. The diurnal variation of Pn, in control groups had a single peak, and no midday photosynthetic depression was observed. Under high salt stress, all the provenances presented midday photosynthetic depression. Path analysis indicated that the major factors affecting Pn were vapor pressure deficit (VPD) and leaf temperature (Tl) , while the minor factors were stomatal conductance (Gs) , intercellular CO2 concentration (Ci), and photosynthetically active radiation (PARi). In the control groups, the photosynthetic characteristics mainly depended on the climate factors of provenance location. Based on the variations of leaf chlorophyll contents and Pn among the provenances under different salt stress, Wanyuan provenance had the highest salt tolerance, followed by Chuzhou provenance, and Feixian provenance.
在5种浓度的NaCl胁迫下，对来自安徽肥西、江苏滁州和四川万源种源的麻栎光合特性进行了研究。对于这3种种源，其叶片叶绿素a（Chl a）和叶绿素b（Chl b）含量以及净光合速率（Pn）均随盐胁迫增强而降低，其中，肥西种源Chl a含量最大降幅为21.5% - 36.1%，万源种源为3.5% - 19.8%。对照组中Pn的日变化呈单峰型，未观察到光合午休现象。在高盐胁迫下，所有种源均出现光合午休现象。通径分析表明，影响Pn的主要因素是水汽压亏缺（VPD）和叶片温度（Tl），次要因素是气孔导度（Gs）、胞间CO2浓度（Ci）和光合有效辐射（PARi）。在对照组中，光合特性主要取决于种源地的气候因子。根据不同盐胁迫下种源间叶片叶绿素含量和Pn的变化，万源种源耐盐性最强，其次是滁州种源，肥西种源最弱。
