浆片由表皮、基本组织和维管束三部分组成。表皮上不具气孔，细胞外壁角质化。维管束为有限外韧型，呈散生状分布。浆片中维管束数与其所含导管数因品种（系）而异，可育系多于不育系。大维管束由数个导管、筛管及伴胞和维管束薄壁细胞组成，且其维管束薄壁细胞壁厚、核大、质浓，线粒体丰富。中、小维管束一般不含导管。浆片中含有淀粉酶。开花时浆片的鲜重、干重和可溶性糖含量均增加。小花的开放由浆片吸胀后体积的变化来调节，而小花的关闭则由于浆片内细胞的自溶、降解物通过质外体途径撤离和浆片的萎缩。闭花过程与小花轴有关 Slice from the epidermis, the basic organization and vascular bundle of three parts. No stomata on the epidermis, keratinized outer walls. Vascular bundles were limited external toughness, was scattered distribution. The number of vascular bundles in the pulp and the number of tubes contained therein vary according to the variety (line), and the fertile line is more than the male sterile line. The large vascular bundle consists of several catheters, sieve tubes and companion cells and vascular bundles of parenchyma cells, and its vascular bundle parenchyma cell wall thickness, large nucleus, thick mass, rich in mitochondria. Medium and small vascular bundles generally do not contain catheters. Pulp contains amylase. The flowering fresh weight, dry weight and soluble sugar content increased. The opening of the floret is regulated by changes in the volume of the swollen pulp, whereas the floret closure is due to the autolysis of the cells in the pulp, the withdrawal of the degradants through the apoplast and the atrophy of the pulp. Closure process and flower axis