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以一个耐盐水稻品种和一个盐敏感水稻品种为材料,从孕穗初期开始进行NaCl胁迫(浓度分别为0、40、80、120mmol/L),研究盐胁迫下水稻叶片光合气体交换参数和叶绿素荧光参数的变化。结果表明:盐胁迫使两个水稻品种叶片叶绿素含量、净光合速率(Pn)、气孔导度(Gs)和表观叶肉导度(AMC)均显著下降,盐敏感品种各指标随盐浓度的增加下降更显著;耐盐品种的胞间CO2浓度(Ci)和气孔限制值(Ls)在各浓度盐胁迫下变化均未达到显著差异,盐敏感品种在低盐浓度(40mmol/L)胁迫下,Ci和Ls变化不显著,在高盐浓度(80mmol/L和120mmol/L)下,Ci显著下降,且Ls显著上升;盐胁迫下两个品种的Fv/Fo、Fv’/Fm’、ΦPSII、ETR、光化学猝灭(qP)下降,非光化学猝灭(qN)升高,盐敏感品种随盐浓度的增加各指标变化更显著。由本试验可知,盐胁迫下水稻品种光合速率的下降是由非气孔限制因素引起的,而盐敏感品种在高浓度盐胁迫下还增加了气孔限制因素。
A salt-tolerant rice variety and a salt-sensitive rice variety were used as materials. NaCl stress (0, 40, 80 and 120 mmol / L respectively) was performed from the early stage of booting to study photosynthetic gas exchange parameters and chlorophyll fluorescence Changes in parameters. The results showed that under salt stress, the chlorophyll content, net photosynthetic rate (Pn), stomatal conductance (Gs) and apparent mesophyll conductance (AMC) of two rice cultivars were significantly decreased, while those of salt sensitive cultivars increased with the increase of salt concentration (P <0.05), and the decrease was more significant. There was no significant difference in salt stress among the salt-tolerance cultivars under salt stress (40 mmol / L) Ci and Ls did not change significantly under high salt concentration (80mmol / L and 120mmol / L), Ci significantly decreased, and Ls increased significantly; under salt stress, the two varieties Fv / Fo, Fv ’/ Fm’, ΦPSII, ETR, photochemical quenching (qP) decreased, non-photochemical quenching (qN) increased, salt-sensitive varieties with the increase of salt concentration more significant changes in each indicator. The results showed that the decrease of photosynthetic rate under salt stress was caused by the non-stomatal limitation, while the salt-sensitive varieties also increased the stomatal limitation under high salt stress.