Drought resistances of leaves of 13 rasberry and blackberry were measured based on 7 xeromorphic indexes , including thickness of leaves , ratio of palisade tissue thickness to cutis tissue , thickness extent of palisade cell density , thickness of cuticular , thickness of two sides of cutis 摘要选取7项叶片旱生结构指标（叶片厚度，栅栏组织厚度叶肉组织厚度，细胞密集度，角质层厚度，上、下表皮厚度） ，观察测定了13个树莓和黑莓品种的叶片的相关指标。
2.
The fact that the xerop - hyte grows naturally in desert presents that the sprout of xerophyte has special adaptive ability to endure the first draught season in its life . it is the most essential factor for the sprout of the xerophyte going through the first hot summer to build up the xeromorphic structure and physiological function 在水分条件渐减乃至干旱、炎热的立地条件中，幼苗能否及时适应? ?旱生结构的迅速形成与生理功能的迅速完善，是决定旱生植物能否在荒漠气候条件下继续生长的至关重要的因素。
3.
There are many adaptive changes in the two research subjects ( artemisia . songarica schrenk . and seriphidium . santolinum ( schrenk ) polijak . ) in morphology and anatomy , such as with the increase of the daily age , the root - shoots ratio increased ; the root became stronger ; the ratio of leaf volume and leaf area increased ; the volume of epidermic cell decreased ; the cut - icle and phellem layer on the surface of root thickened . stoma caved in leaf ; epidermal hair of leaf and stem well - developed , palisde tissue developed well , the cell gap decreased ; the spongy tissue disappeared ; leaf is kinds of isolateralthat is the typical xeromorphic structure ; crystal cell and fibric cell increased ; conducting tissue and mechanical tissue developed well ; bundle sheath appeared 实验研究的两种菊科（ compositae ）植物（准噶尔沙蒿（ artemisiasongaricaschrenk ）和沙漠绢蒿（ seriphidiumsantolinum ( schrenk ) poljak . ） ） ，形态解剖方面的变化表现为：随日龄增加，根长/株高比值日益增大；根系逐渐发达；体积与叶面积比逐渐增大；表皮细胞体积变小；角质层增厚；根外部出现加厚的木栓层；气孔下陷；叶、茎部的表皮毛密布，栅栏组织日益发达；而细胞间隙日渐变小；海绵组织逐渐消失；叶面结构常为典型旱生结构? ?等叶面；晶细胞及纤维细胞数目增多；输导组织、机械组织日渐发达；具有维管束鞘等等。
