赖草属种子胚乳细胞多样性研究

Study on diversity of endosperm cells in seeds of Leymus

对赖草属21个物种的胚乳细胞特征进行了解剖观察,发现赖草属植物种子胚乳细胞存在丰富的多样性,不同物种的胚乳细胞在大小、形状和数量上均表现出明显的差异,其胚乳细胞的特征具有类群鉴分的价值.属于较原始的sect.LeymusHochst.组的沙生赖草、大赖草和滨麦具有较大而多的胚乳细胞,属于较进化的sect.Anisopy-rum Griseb. Tzvel.组的多枝赖草和灰赖草具有较小而少的胚乳细胞.

The endosperm cells of 21 species of Leymus Hochst.were surveyed in this paper.The results showed that there exists distinct variation in endosperm cells of Leymus species.Different species have significant variation including differences in the sizes,forms and quantity of endosperm cells.The characters of endosperm cells may be used to distinguish the species in Leymus.L.arenarius (L.) Hochst.,L.racemosus (Lam.) Tzvel.and L.mollis (Trin.) Hara belong to relatively primitive sect.Leymus Hochst.,with more and bigger endosperm cells than those of L.multicaulis (Kar.& Kir.) Tzvel.and L.cinereus (Scribn.& Merr.) A.Love,which belong to relatively advanced sect.Anisopyrum (Griseb.) Tzvel.