MT-1象草及其近缘品种的外稃微形态特征

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。

Lemma micro-morphological characteristics of MT-1 elephantgrass and its closely related varieties

Micro-morphological characteristics of lemmas of Pennisetum purpureum cv. MT-1 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 varieties can be identified and distinguished.