两种竹果的胚体类型及系统分类意义

竹类果实胚体类型复杂多样,中胚轴的有无,外胚叶的存在与否,盾片是否具有裂片,第一叶折叠或卷曲为大致的划分标准。胚的类型,胚芽、胚根与盾片的关系,胚体弯曲程度,中胚轴伸长程度及盾片的大小和形态等,在不同的种中有不同的特征。首次报道了花眉竹和融安黄竹这两种竹果的胚体类型分别为P+PP和F+PP及各自的特征,并探讨其系统分类的意义,为竹类植物的系统分类补充解剖学方面的证据。

The embryonic types of two bamboo fruits and their systematic significance

The embryonic types of bamboo fruits are very variable and complicated. The basic rule of classification is:mesocotyl present or absent;epiblast present or absent;scutellum cleft present or absent;the first leaf rooled or folded. These characters such as the embryonic types,the angles between the plumule and the scutel,between the radicle and the scutel,the curve degrees of the embryo,the extension of the mesocotyl,the sizes and shapes of vertions of scutels are constant in the same species of bamboo,but vary in different species. In present paper, the embryonic types of fruit in Bambusa longispiculata sensu Chia et Fung and Dendrocalamus ronganensis Q.H.Dai et D.Y.Huang are reported as P+PP and F+PP respectively. The systematic significance of classification has been discussed. It supplements some anatomic proof for systematics and taxonomy.