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用两个玉米品种,于春、夏两季播种,对玉米植株基部(第3叶)、下部(第7、9叶)、中部(果穗叶)和上部(倒二叶)四个叶位叶片,进行叶肉细胞的形态、气孔器的分布、维管束的数目、叶绿素的含量和光合强度的综合研究。趋势如下:叶肉细胞的形态具有多样性,果穗叶最复杂,四环以上细胞的比例最高,自果穗叶向上向下各叶渐趋简单。不同叶位叶片气孔器的密度,有随叶位上升而增加的趋势。在维管束的数目、导管粗度、叶绿素的含量和光合强度诸方面,果穗叶均高于其它叶位。综上所述,玉米不同叶位叶片的结构与功能的变化趋势是一致的,中部果穗叶片优于其它叶位。
Two corn cultivars were sowed in the spring and summer seasons. Four leaf positions of the corn plant base (the third leaf), the lower part (the 7th leaf and the 9th leaf), the middle (ear leaf) and the upper leaf (the second leaf) , Mesophyll cell morphology, stomatal apparatus distribution, the number of vascular bundles, chlorophyll content and photosynthetic intensity of a comprehensive study. The trend is as follows: Mesophyll cell morphology diversity, the most complicated ear leaves, the highest proportion of cells above the tetracyclic, leaves from the ear leaves up and down the leaves gradually simple. The leaf stomatal densities at different leaf positions increased with leaf position increasing. In terms of the number of vascular bundles, the diameter of the tube, the content of chlorophyll and the photosynthetic intensity, the ear leaves were higher than the other leaf positions. In summary, the trend of the structure and function of leaves at different leaf positions of corn is consistent, and the middle ear leaves are superior to other leaf positions.