Anatomical Structure Changes of the Ammopiptanthus mongolicus Adapting to Arid Environment
Taking Ammopiptanthus mongolicus seedlings as test materials,the effects of different soil moisture contents on the anatomical structure of roots,stems,and leaves were studied using paraffin sectioning method,in order to provide reference for the development and utilization of Ammopiptanthus mongolicus.The results showed that Ammopiptanthus mongolicus could still grow normally when the soil moisture content was 2％-4％,but there were differences in the structure of roots,stems and leaves of Ammopiptanthus mongolicus under different water contents.With the decrease of soil moisture,the root growth of Ammopiptanthus mongolicus was more slender,the degree of lignification was deeper,and the relative thickness of the periderm increased.The drought resistance of the plant was improved by developing and differentiating the root structure.The stem and leaf epidermis of Ammopiptanthus mongolicus were attached to the cuticle,and there were cortical vascular bundles in the stem cortex to improve the transport capacity.At the same time,the pith was still developed when the soil moisture was low,showing strong water storage capacity.The leaf of Ammopiptanthus mongolicus was an isobilateral leaf.With the decrease of soil moisture,the leaf thickness,cuticle thickness,hole depth,palisade tissue/sponge tissue ratio,main vein vascular tissue and lignification degree all increased to varying degrees.It could adapt to the arid environment by reducing water loss,improving gas exchange,improving leaf area utilization and photosynthesis.
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