秋茄木榄繁殖体的结构及其生态特异性

Anatomical Structures and Ecologcal Adaptations of Mangrove propagules

秋茄、木榄繁殖体的解剖结构表明，伴随着胎萌现象的发生，胚胎在生长发育过程中结构上发生高度特化，子叶表面发达的吸收组织与子叶吸收作用密切相关；内生性胚根，可使幼嫩的根端免遭外界环境影响；胚轴内中柱鞘细胞的存在保证了植株具有发达的根系以适应海岸环境。结果表明，秋茄、木榄胚轴结构有趋同现象，两者角质层都较厚，皮层内通气组织发达，皮层薄壁细胞都呈网状纤维素加厚。

The anatomical structures and ecological adaptations of Kandelia candel and Bruguteragymnorrhiza propagules were shown in this paper,The results showed that several peculiar struc-tures happened in mangrove propagules,for example,the differentiation of cotyledon.the endo-genecy of radicle and the existing of pericycle in hypocotyl etc。 ,which have never been found inother dicotyledons.It was demonstrated that the structural peculiarities of propagules and the phe-nomenon of vivipary in mangrove were the result of adaptation to the relatively saline habitat。The studies also exhibited convergent adaptation on both plant propagules。