Leaf Blade Comparative Anatomy between the Female and the Male of Populus euphratica Oliv.

The anatomical characteristics of females and males from Populus euphratica Oliv.were studied by paraffin section.The results are as follows:(1) All the female and the male leaves are composed of leaf epidermis,mesophyll and vein.Leaf epidermis is multi-epidermis usually composed of 2 layer cells.Near by adaxial and abaxial hypodermis,there are 2～3 layer palisade tissue cells.Between palisade tissue cells,there are a few sponge tissue cells.The number of vascular bundle in main vein is usually single,and they are composed of xylem,phloem,a little cambium and vascular bundle sheath that are similar to Poaceae'.(2)The female thickness of epidermal cells and horny layer,the thickness of mesophyll and palisade tissue,and the height of vascular bundle and xylem are obviously bigger than male'.(3)The female stomata numbers in epidermis,the percentage of palisade tissue in mesophyll and the precentage of xylem in main vein vascular bundle are a little different from the male,but the results of analysis of correlation and variance showed they are not significant.(4)The anatomical characteristics of the female leaves and the male leaves are accord with xerophyte,but the female characteristics to the responses of drought are more obvious than the male' and it is possible to related with their reproductive function.