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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。
In order to investigate the salt tolerance of poplar, the new poplar lines Nan Yang 1 and Nan Yang 2 bred in this laboratory were used to study the effects of different NaCl concentrations on dry weight, water potential, chlorophyll content, Effects of Chlorophyll Fluorescence Parameters and Light Energy Distribution. The results showed that the effects of low salt (75mmol.L-1NaCl) on dry weight, chlorophyll content, photochemical quenching (qP), actual photochemical yield (PSI) and photosynthetic electron transfer rate (ETR) While the effect of Nanyang 2 on the water potential of Nan Yang 1 was significantly lower than that of Nanyang 2. However, the maximum photochemical efficiency (Fm / Fv) of photosystem Ⅱ and the effective photochemical quantum yield of photosystem Ⅱ (Fm ’/ Fv’ Change is not obvious. The inhibitory effect of high salt (150mmol.L-1NaCl) on the two lines was not significant. Salt treatment conditions, Nan Yang 2 photochemical reaction part (Pc) average than the South Yang 1, the antenna heat dissipation energy (Hd) the proportion of lower than the South Yang 1, South Yang 1 and South The average energy (Ex) dissipated by non-photochemical reactions in Yang 2 reaction center is relatively close. The results showed that under salt stress, the higher activity of photosystem Ⅱ in Nan Yang 2 was one of the important reasons for its salt tolerance being higher than that of Nan Yang 1.