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本研究比较了东北玉簪和白玉簪气孔形态对气孔功能和水分利用效率的影响。结果表明,东北玉簪的气孔密度远高于白玉簪,但气孔孔径略小于后者。强光下,东北玉簪的光合速率、气孔导度和水分利用效率均高于白玉簪,但弱光下差异较小。水分胁迫下,两者的光合速率和气孔导度等均迅速降低,强光能够增强水分胁迫下两种玉簪水分利用效率的差异,且东北玉簪的气孔对强光和水分胁迫的交互作用更加敏感。据此,玉簪种间气孔形态差异对水分利用效率的影响在很大程度上受光环境的调控,东北玉簪较小的气孔、较大的气孔密度以及较强的气孔敏感性对其在强光与水分胁迫下维持较高的水分利用效率起重要作用。
This study compared the stomatal morphology and the water use efficiency of Hosta somata and Pinctada arborvitae from Northeast China. The results showed that the stomatal density of Hosta soongorica was much higher than that of Platycladus orientalis, but the stomatal aperture was slightly smaller than the latter. Under the light, the photosynthetic rate, stomatal conductance and water use efficiency of Hosta in northeastern China were higher than those of Hostama orientalis, but the difference was less in low light. Under water stress, the photosynthetic rate and stomatal conductance of the two cultivars decreased rapidly. Strong light enhanced the water use efficiency of the two species, and the stomata were more sensitive to the interaction between light stress and water stress . Therefore, the effect of interspecific stomatal differences on water use efficiency of Juglans mandshurica was largely controlled by the light environment. The smaller stomata, larger stomatal density and stronger stomatal sensitivity of Hosta solanacearum were more sensitive to light and Water stress to maintain high water use efficiency play an important role.