干旱胁迫下不同家系马尾松部分生理活动的变化

Effect of Soil Drought Stress on Part Physiological Activities of Masson Pine of Different Family

探讨了土壤干旱胁迫下,不同家系马尾松部分生理活动的变化。结果表明,马尾松苗木暗呼吸速率随叶水势的下降而下降,但家系不同,其下降的幅度不同。同时,光合利用效率随叶水势、土壤水势的下降总体呈上升趋势,说明马尾松具有较高的耐旱生产潜力。此外,各家系随土壤干旱胁迫的加剧,质膜相对透性加大,膜受伤害的程度也加大,其质膜相对透性与叶水势呈线性显著相关。

We detect the effect of soil drought stress on part physiological activities of Masson pine of different family. The dark respiration rate of Masson pine will decrease with different range of the decrease of leaf water potential. The photosynthesis rate will increase with the descendant leaf potential and soil potential,which demonstrates that Masson pine has much higher productivity of drought stress. Meanwhile,the relative plasma membrane permeability plasma will be enlarged and the membrane will be hurt more deeply when Masson pine meets with higher drought stress. The relationship between relative plasma membrane permeability and leaf potential shows significant linear correlation.