叶子花表皮特征的研究及意义

对叶子花（Bougainvillea spectabilis）正常叶和变态叶上气孔密度、气孔指数和保卫细胞大小进行了研究。结果表明：正常叶上表皮的表皮细胞为多边形,垂周壁平直;下表皮的表皮细胞为不规则型,垂周壁浅波状;气孔类型为不规则型。变态叶上表皮没有发现气孔,变态叶下表皮的表皮细胞垂周壁则由浅波形逐渐变为深波形,气孔类型为不规则型和轮列型。随着变态叶的发育,变态叶下表皮的气孔密度降低,气孔指数升高;变态叶保卫细胞的长增大,宽减小。变态叶的平均气孔密度和平均气孔指数明显低于正常叶。正常叶和变态叶的保卫细胞均呈肾形。

The Epidermal Characteristics of Bougainvillea spectabilis Willd and Their Significance

Stomata density,stomata index,and guard cell size on normal and abnormal Bougainvillea spectabilis Willd leaves were investigated.Results showed that epidermal cells were polygonal with straight anticlinal walls in the adaxial epidermis of the normal leaf;while in the abaxial epidermis,the epidermal cells were irregular with repand an-ticlinal walls.Normal leaf stomata were anomocytic.No stomata were found in the adaxial epidermis of abnormal leaf,while epidermal cells were repand or sinuous.Stomata were anomocytic and cyclocytic.With abnormal leaf development,stomata density on the abaxial epidermis decreased and stomata index increased;guard cells lengths on the abaxial epidermis increased and widths decreased.Average stomata density and average stomata index on abnormal leaves were significantly lower than on normal leaves.Guard cells were kidney-shaped on both normal and abnormal leaves.