羽叶薰衣草表皮毛的发育解剖学研究

Developmental Anatomy of Trichomes in Lavandula pinnata L.

摘要:

对羽叶薰衣草（Ltwandula pinnata L．）茎和叶上两种表皮毛（腺毛和非腺毛）发育的解剖学观察表明，两者的发生都源于茎或叶的原表皮细胞，但外部形态、发育过程及功能明显不同。腺毛有头状腺毛和盾状腺毛两种类型，均由1个基细胞、1个柄细胞和头部细胞构成。头状腺毛的头部只有1个或2个分泌细胞，盾状腺毛由8个分泌细胞构成头部。非腺毛由3—20个细胞组成，可分为三种类型：单列不分枝、二又分枝和三又及三又以上多分枝的树状分枝。非腺毛的顶部细胞由基部到顶部逐渐变细，先端成尖形。腺毛发育由原表皮细胞经两次平周分裂形成，由于柄细胞和头部细胞所处的分化状态不同而发育成两类腺毛。非腺毛由非腺毛原始细胞经二次或多次平周分裂和不均等分裂，再发育成数个至二十多个子细胞。

Abstract:

Developmental anatomy of trichomes （glandular hairs and non-glandular hairs） on the leaves and stems ofLanvandula pinnata was studied. It was shown that all trichomes are originated from the protodermal cells, but their structure, development and function are distinctly different. There are two types of glandular hairs, capitate glandular hairs and peltate glandular hairs, all of which are composed of a basal cell, a stalk cell and apical secretory cells. There are 1 or 2 secretory cells in a capitate glandular hair but 8 secretory cells in a peltate glandular hair. However, Non-glandular hairs consist of 3-20 cells, they can be divided into 3 kinds： uniseriate, two-branched, three-branched and more branched arborization. In non-glandular hairs, the apical cells become tapered. The glandular hairs are formed by second successive periclinal divisions of the initial cell, and because of the different meristematic state of the stalk cells and apical cells, they developed into two types, capitate and peltate. Non-glandular hairs are created from initial cells through second or more periclinal divisions and unequal divisions, then developed into several to about twenty sister cells.