中文摘要：

采用电镜扫描技术对MT-1象草及其近缘品种的外稃进行了观察分析。结果表明，象草外稃的微形态具有丰富的多态性，5个象草品种（品系）间，其外稃共有7种表皮细胞形态，其中以十字形、哑铃形、念珠形硅细胞最为普遍；外稃毛被主要集中在中部，各品种类型各异，11种毛被类型中短基微毛和有尖刺毛为共有类型。依据乳突类型，可以将5个品种（品系）分为4类。根据外稃表皮微形态的差异，可以对MT-1象草及其近缘品种进行比较鉴定并加以区分。

英文摘要：

Micro morphological characteristics of lemmas of Penniseturn purpureurn ev. MT1 and its closely related varieties were investigated using scanning electron microscopy. An abundant polymorphism of micro-morphological characteristics of lemma was revealed among the elephantgrass varieties. The results showed that there were seven different kinds of epidermal cell, three of which, cross-shaped, dumb-bell-shaped, moniliform cell, were widespread. Eleven different types of indumentums were mainly seen in the middle of the elephantgrass lemma and two of them, microhairs with short basal cell and prickle hairs were in common. Five elephantgrass varieties were divided into four groups according to different kinds of tubercles. Based on the differences of micro-morphological characteristics of lemma surfaces, MT 1 elephantgrass and its closely related vari- eties can be identified and distinguished.