The induction of sun and shade leaves of the European beech (Fagus sylvatica L.): anatomical studies
The induction of sun and shade leaves of the European beech (Fagus sylvatica L.): anatomical studies
复制标题
DOI：
10.1007/bf00202394
复制
发表时间：
1989-05-01
影响因子：
2.3
通讯作者：
Essiamah, Sam
中科院分区：
文献类型：
--
作者：
Eschrich, Walter;Burchardt, Roswitha;Essiamah, Sam
欧洲山毛榉（FagussylvaticaL.）每年收集六次用于解剖研究。分化成阳叶和阴叶原基的第一次观察在8月初。阳生叶原基有五层叶肉分生组织细胞，阴生叶原基有四层叶肉分生组织细胞。采用盆栽嫁接方法，研究了山毛榉叶原基可能发生的结构变化。适应遮荫的树木在充分光照下会产生阳光叶原基，前提是转移发生在7月之前。适应全日照的树木发育出叶原基，当植物处于遮荫条件下时，叶原基在结构上仍然是阳叶原基。二月份砍伐的年轻山毛榉树的阴叶树枝，以便将阴芽暴露在充足的日光下，形成阴叶或中间阴/阳叶。结果表明，对生叶可以为腋芽的发育提供同化物，但对生叶的性质，无论是阳叶还是阴叶，对叶原基的性质没有影响。
Primordia from buds of sun and shade twigs of European beech (Fagus sylvatica L.) were collected six times a year for anatomical investigations. Differentiation into sun-leaf and shade-leaf primordia was first observed in early August. Sun-leaf primordia had five, and shade-leaf primordia four layers of mesophyll meristem cells. With potted graft unions of beeches possible structural changes of leaf primordia were investigated. Trees adapted to shade develop sun-leaf primordia when put into full daylight, provided the transfer happened before July. Trees adapted to full daylight developed leaf primordia which remained structurally sun-leaf primordia when the plant was kept under shade conditions. Shade-leaf branches of young beech trees cut in February in order to expose the shade buds to full daylight developed either shade leaves or intermediate shade/sun leaves. These experiments show that the subtending leaf may provide the developing axillary bud with photoassimilates, but its character, whether sun or shade leaf, has no influence on the character of the developing leaf primordia.