盐胁迫抑制槲栎2变种光合作用的机理研究

Photosynthesis Inhibition of Two Varieties of Quercus aliena in Salt Stress

以不同浓度NaCl处理北京槲栎和锐齿槲栎的2年生幼苗,研究盐胁迫条件对其生长、光合作用及叶绿素荧光特性的影响。结果表明,(1)随着盐浓度的增加,总叶面积、植株鲜重和干重、叶片净光合速率(Pn)、气孔导度(Gs)、气孔限制值(Ls)、叶绿素含量(Chl)和光系统Ⅱ光合电子传递量子效率(ФPSⅡ)均显著降低,而光系统Ⅱ的初始荧光(F0)和光化学效率(Fv/Fm)无显著变化。(2)北京槲栎生长受盐胁迫的干扰小于锐齿槲栎,其净光合速率下降幅度相对较小,光合结构受胁迫的程度小于锐齿槲栎。

The two years old seedlings of Quercus aliena var. pekingensis and Q. aliena var. acuteserrata were treated with different concentrations of NaCl. The result showed that NaCl stress decreased plant total leaf area, fresh weight, dry weight, photosynthetic rate, stomatal conduction, stomatal limit, chlorophyll content and quantum yield of PS Ⅱ obviously. However,the initial fluorescence and photochemical efficiency of PSⅡ was not affected by salt stress. The plant growth of Q. aliena var. pekingensis was less affected by salt stress than Q. aliena var. acuteserrata. The photosynthetic rate was less decreased and the photosynthetic apparatus was less injured by salt stress than Q. aliena var. acuteserrata was.