摘要
以不同浓度(NaCl,100、200、300、400 mmol.L-1和NaHCO3,50、100、150、200 mmol.L-1)盐胁迫的角果碱蓬(Suaeda corniculata)幼苗为处理,以不施加盐胁迫的角果碱蓬幼苗为对照,比较不同浓度中性盐(NaCl)和碱性盐(NaHCO3)对角果碱蓬光合、叶绿素荧光等生理指标的影响情况。结果表明:随着盐碱浓度的增大,角果碱蓬幼苗的鲜质量及干质量均逐渐降低;净光合速率在较低盐碱浓度(≤200 mmol.L-1NaCl或≤100 mmol.L-1NaHCO3)时变化不显著,但随着胁迫浓度的升高显著下降;气孔导度、蒸腾速率下降显著;胞间CO2摩尔分数变化不明显;初始荧光F0逐渐升高;PSII最大光化学量子产量Fv/Fm、光化学淬灭系数qP和PSII非循环光合电子传递速率RE,T均呈下降趋势。表明在较低盐碱浓度下,角果碱蓬幼苗仍可维持光合系统功能,但较高浓度的盐碱胁迫抑制了角果碱蓬幼苗的光合作用,影响了幼苗的正常生长。
An experiment was conducted to study the photosynthesis and chlorophyll fluorescence parameters of Suaeda corniculata seedlings under different concentrations of salt （ NaCl, 100, 200, 300, 400 mmol·L-1 ） or alkaline （ NaHC03, 50, 100, 150,200 mmol·L-1 ） stress. Results showed that the fresh and dry weights of the seedlings decreased gradually with increasing concentrations of NaCl and NaHCO3. Compared with the control, the net photosynthetic rate of the seedlings had no significant difference under low salinity stress （ less than or equal to 200 mmol ·L-1 of NaCl or less than or equal to 100 mmol ·L-1 of NaHCO3 ） , but decreased obviously under high salinity stress. With increasing concentrations of NaCl and NaHCO3 , stomatal conductance and transpiration rate decreased significantly, and intercellular CO2 concentration had no significant difference; the PSII maximal photochemical efficiency, the photosynthetic electron transport and the photochemical quenching coefficient displayed decreasing tendencies, whereas the primary fluorescence increased. These results suggest that the photosynthesis of S. corniculata seedlings has no significant difference under low salinity stress compared with the control, whereas under high salinity stress, the photosynthesis is seriously affected, and the seedling growth is inhibited.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2012年第1期32-35,共4页
Journal of Northeast Forestry University
基金
东北林业大学研究生论文资助项目(STIP10)
关键词
盐碱胁迫
角果碱蓬
光合作用
Salt and alkali stresses
Suaeda corniculata
Photosynthesis
