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| Response of Leaf Stomatal Characteristics of ThreeSpecies of Juniperus to Natural Light Intensity |
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| DOI：10.16768/j.issn.1004-874X.2022.04.004 |
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| Abstract: |
| 【Objective】Light-induced stomatal opening and closing is an important factor regulating CO2
intake
and transpiration in plants. The study of plant stomatal characteristics under different light environments is helpful to
understand the mechanism of plant adaptation to the environment.【Method】Taking three species of Juniperus plants with
heteromorphic leaves widely cultivated in northern China as research objects, the stomatal characteristics were observed and
parameters were measured by using NaClO method, and the stomatal characteristics and their correlation under short-term
light change （diurnal change） and long-term light difference （shady and sunny sides of the canopy） in the same habitat
were investigated.【Result】The leaves of three species of Juniperus had two leaf shapes. The stomata of scale leaves were
distributed on the adaxial side and the abaxial side at the junction of two scale-like leaves, and the stomata of thorn leaves
were only distributed on the adaxial side with two stomatal bands. Under diurnal changes, the width of guard cells in leaves
of the three species of Juniperus at noon decreased significantly by 0.06%, 0.09% and 0.09% compared with that in the morning, and the stomatal opening increased significantly by 27.6%, 24.3% and 24.3%, and they were negatively correlated,
however, there was no significant difference in guard cell length and stomatal density between morning and noon, indicating
that the three species regulated stomatal aperture to adapt to short-term light changes mainly by guarding the contraction of
cell width.【Conclusion】There were significant differences in guard cell length and width, stomatal density and stomatal
aperture between the sunny leaves and the shady leaves of the canopy of the three species, and the first three parameters were
significantly correlated with stomatal aperture, indicating that the three species changed stomatal aperture by regulating guard
cells in length and width and stomatal density to adapt to the long-term light difference. Stomatal characteristics can better
reflect the difference of plant adaptability to long-term and short-term light. |
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