鸡蛋花(夹竹桃科)花表皮气孔的初步研究

Stomatal distribution on the flower of Plumeria rubra

对鸡蛋花花表皮的气孔进行初步研究,结果发现:花冠裂片的上表皮没有气孔的分布;花冠裂片的下表皮则有气孔的分布。当花冠裂片长度1.5cm时,气孔密度最大,且极显著地高于花冠裂片长度为2.0、2.5、3.5cm和4.0cm时的气孔密度。长度为3.0cm的花冠裂片的气孔指数最大,与花冠裂片长度为1.0、2.0、3.5cm和4.0cm时的气孔指数的差异均达极显著水平。在花冠筒长度为0.3cm和0.4cm时,没发现气孔;当花冠筒生长到0.5cm时开始出现气孔。花冠筒长度为0.6cm时,气孔密度最大,且极显著地高于其它长度花冠筒的气孔密度。花冠筒长为0.6、1.1cm和1.3cm时的气孔指数均极显著地大于长度为0.5cm花冠筒的气孔指数。花冠裂片和花冠筒下表皮的普通表皮细胞都呈不规则的多边形,保卫细胞呈半月形。

Stomatal distribution on the flower of Plumeria rubra was observed. There were stomata on the abaxial surface of corolla sliver,and no stomata on the adaxial surface. The stomatal density was the highest on the abaxial surfaces of corolla sliver which were 1.5 cm long. Furthermore,the differences in stomatal density between 1.5 cm and 2.0 cm,1.5 cm and 2.5 cm,1.5 cm and 3.5 cm,1.5 cm and 4.0 cm corolla sliver were highly significant. The stomatal index on the abaxial surface of 3.0 cm corolla sliver was the highest. The differences in stomatal index between 3.0 cm and 1.0 cm,3.0 cm and 2.0 cm,3.0 cm and 3.5 cm,3.0 cm and 4.0 cm corolla sliver were highly significant. No stomata were found on the adaxial surface of 0.3 cm and o.4 cm corolla tube. The stomata begin to emerge when the corolla tube grow to 0.5cm long. The stomatal density on abaxial surface of 0.6 cm corolla tube was the highest. The differences in stomatal density among 0.6 cm corolla tube and other length corolla tubes were highly significant. The stomatal indices on corolla tube which was 0.6 cm,1.1 cm and 1.3 cm were significantly higher than that of 0.5 cm. Ordinary epidermal cells were usually irregular in shape,while guard cells were kidney-shaped on the abaxial surface of corolla sliver and corolla tube.