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中文摘要：
为探讨杨树耐盐性,以本实验室育成的杨树新品系南杨1号和南杨2号为材料,研究了不同浓度NaCl对南杨1号和南杨2号植株干重、水势、叶绿素含量、叶绿素荧光参数和光能分配的影响。结果表明：低盐（75mmol.L-1NaCl）胁迫对南杨1号干重、叶绿素含量、光化学淬灭系数（qP）、PSⅡ的实际光量子产量（Yield）和光合电子传递速率（ETR）的抑制作用显著要高于南杨2号,南杨1号水势的下降幅度高于南杨2号,而光系统Ⅱ最大光化学效率（Fm/Fv）和光系统Ⅱ有效光化学量子产量（Fm＇/Fv＇）变化不明显。高盐（150mmol.L-1NaCl）胁迫对2个品系的抑制作用差异不显著。盐处理条件下,南杨2号光化学反应的部分（Pc）平均值比南杨1号高,天线热耗散的能量（Hd）所占比例低于南杨1号,南杨1号和南杨2号反应中心由非光化学反应耗散的能量（Ex）平均值比较接近。表明盐胁迫下,南杨2号光系统Ⅱ维持较高的活性是其耐盐性高于南杨1号的重要原因之一。
英文摘要：
In order to understand the salt-tolerance of poplar, the seedlings of poplar cultivars Nanyang No. 1 and Nanyang No. 2 bred by the Jiangsu Provincial Key Laboratory of Marine Biology were taken as the test materials to study their dry weight, water potential, chlorophyll content, chlorophyll fluorescence parameters, and light energy absorption and distribution under the stress of different concentrations NaC1. At low concentration （75 mmol~ L-l ） NaC1, the plant dry weight, chlorophyll content, qP, Yield, and ETR of Nanyang No. 1 were significantly lower than those of Nanyang No. 2. The decrement of the water potential of Nanyang No. 1 was higher than that of Nanyang No. 2, while the Fm/Fv and Fm＇/Fv＇ of the two cuhivars had less change. At high concentration （150 mmol~ L-l） NaC1, there were no significant differences in the inhibitory effects of salt stress on Nanyang No. 1 and Nanyang No. 2. Under salt stress, Nanyang No. 2 had higher average value of Pc but lower proportion of Hd than Nanyang No. 1, while the average value of E~ of the two cuhivars had little difference. Above all, due to the high- er activity of photosystem 11 , Nanyang No. 2 had higher salt-tolerance than Nanyang No. 1.
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