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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 to 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 were arranged in neat and compact long column shape, and the upper and down epidermis were thickened. The upper and down epidermis produced more trichomes to resist stress. After rehydration, leaf porosity increased and trichomes had a corresponding reduction. The principal component analysis showed that the stratum corneum thickness, leaf thickness and palisade were 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.
Key words Streblus asper leaves; Anatomical structure; Drought resistance; Stress
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Streblus asper Lour, a member of genus Streblus, is a kind of a small evergreen tree or large shrub in plexiform or shrubs, and it has strong adaptability and resistance to drought and barren. Flowering in spring and fruiting in summer, it has the fruit in bilateral kidney shape, which is in golden color when maturing, and the fruit pulp is edible with sweet taste11-2'. S. asper is distributed i n Guangxi, Yunnan, Guangdong, Hainan in China, and Sri Lanka, India, Malaysia in foreign countries. The stem bark fiber can be used to wove sacks, and can be used as the raw material for artificial cotton and papermaking [3]. Studies on the chemical composition and pharmacological effects of S. asper show that the plant has antibacterial[4], pest killing151 and anti-cancer161 effects, and it can be used to treat gingivitis, ulcer, have a fever, diarrhea and other diseases. In addition, it is used as the woody feed in some areas of China171....