玉米(Zea mays L.)叶脉发育的研究

The development of vein in Zea mays L.

玉米的叶脉在单子叶植物中有一定的代表性，叶脉由四级组成，粗细不同的一、二、三级叶脉均从叶基向叶尖方向延伸，属叶片的纵向叶脉，四级脉横向与一、二、三级叶脉连接，是横向的叶脉，各级叶脉有各自的形成方式，由于它们有规律的分布，从而构成了叶片的输导网络，各级叶脉的发生和发育与叫片的生长有直接的关系。

There were four levels of venation development in the leaf of maize (Zea mays L.). The first, second and third level of the veins compose of their sizers (coarse or fine ), extended longitudinal from the leaf sheath at the base towards the leaf tip respectively. The fourth level of the vein developed cross-wisely linking up with the first, second and third venations longitudinally distributed. All the four venations had their independence patterns of development and distribution which are closly related to the leaf growth and in consequence formed a characteristic transportation frame-work.