燕山山脉野生欧李群体叶表皮微形态特征研究

Leaf Epidermal Micro-morphology Characteristics of Wild Cerasus humilis(Bge.) Sok.of Yanshan Mountains

利用扫描电子显微镜对同一生境条件下自然生长的燕山山脉野生欧李实生群体(含嫁接类型)叶片表面微形态特征进行观测。结果表明:欧李叶表皮细胞形态存在两种类型,一类是上下表皮细胞向下凹陷相互连接形成蜂窝状,另一类是上下表皮细胞向上隆起近圆形,且上表皮细胞均具条纹状的角质层;叶片上表皮仅有表皮毛而无气孔分布,叶片下表皮仅有气孔分布;气孔突出于表皮细胞,属无规则型,气孔平均长度8.22±1.30μm,宽度2.55±0.65μm,大小21.64±8.60μm2,密度836.23±197.16个/mm2;欧李群体中不同株系间、叶表皮细胞形态不同类别间气孔特征变异程度较大,可作为欧李优异种质选育和抗干旱胁迫研究的指标之一。

The leaf epidermal micro-morphology characteristics of wild Cerasus humilis（Bge.） Sok.including seeded and grafted types living in Yanshan Mountains were observed with Scanning electron microscope（SEM）.The results showed that the upper and lower epidermal cells morphology can be divided into two types,one type was concave and connected like a honeycomb and the other type was ridgy and nearly circle.The upper epidermal cells were covered with striated cutin.There were some epidermal trichomes but no stomata on the upper epidermis,while on the lower epidermis only stomata distributed.The stomata extruded from epidermal cells which belong to irregular type.The average length,width,size and density of stomata were 8.22±1.30μm,2.55±0.65μm,21.64±8.60μm^2 and 836.23±197.16mm^-2,respectively.Stomata characteristics indicated significant differences in different plants and different epidermal cell morphology,which can be used as basis for seed-selection and research on anti-drought stress of wild C.humilis（Bge.） Sok.