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| Anatomy of different ages of Streblus asper leaves and their drought resistance |
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| DOI：10.16768/j.issn.1004-874X.2016.08.011 |
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| Abstract: |
| The leaf thickness，stratum corneum thickness，epidermis thickness，palisade tissue thickness and sponge tissue thickness of streblus asper leaves at different ages were observed by using paraffin section technology and optical microscopic observation to explore the anatomic adaptive response mechanism to drought stress，also provide a theoretical basis for S. asper introduction. The results showed that：Under drought stress，various parts of S. asper leaf anatomy showed some characteristics adapted to water environment. Leaf palisade tissue cells became shorter，increasing from 1-2 layers to 2-3 layers；Sponge cells arranged in neat，compact，upper and down epidermis were thickened. Upper and down epidermis produced more trichomes to resist stress. After rehydration，porosity blade increased and trichomes had a corresponding reduction. The principal component analysis showed that the stratum corneum thickness，leaf thickness and palisade was available to describe the impact of stress and rehydration on different ages of S. asper leaf anatomy. Under drought stress，S. asper leaf stratum corneum thickness and leaf thickness increased and leaves returned to normal after rehydration. Middle and top leaves were better than basal leaves in response to drought stress sensitivity. |
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