疏花水柏枝种子结构特征的研究  

Study on Structural Traits of Seed of Myricaria laxiflora(Tamaricaceae)

作　　者：陶勇[1] 陈防[1] 万开元[1] 李建强[1] 孟爱平[1] 陈树森[1] 

机构地区：[1]中国科学院武汉植物园,湖北武汉430074

出　　处：《云南植物研究》2008年第2期190-194,共5页Acta Botanica Yunnanica

基　　金：中国科学院方向性项目(KSCX2-SW-104)

摘　　要：对长江三峡库区特有河岸植物疏花水柏枝的种子适宜于水力传播的结构特征进行了研究,结果表明,成熟种子具直立型胚,无胚乳。种皮细胞一层,其外围有较厚的脂质层。胚轴和子叶的细胞均纵列排列,具较大列间隙,有时,在胚轴上可见位置不定的坑。胚根区有栅栏状细胞,珠孔区以上有薄壁细胞解体后形成的断裂层。中央维管网贯穿胚体,其盲端区常出现不能与之连通的局部输导组织。种子的结构特征为水力扩散提供了便利,但也限制了扩散效力。本文可为该物种的种群构建等生态学研究提供生物学根据。The anatomy structure waits suitable for long-distance hydrochory, of the seed of Myricaria laxiflora, an endemic riverain shrub, distributed along the Yangtze River from Chongqing to Yichang, were investigated. Results suggest that a mature seed, without endosperm, involves an erect embryo, and one layer of seed coat cells, outside of which is covered with a thick layer of lipid integument. The cells of hypocotyl and cotyledon array like longitudinal lines, and between the lines, an obvious linear gap can be seen. Sometimes, pits may appear in hypocotyl areas. In radicle areas, there are palisade cells and a lucuna which located above micmpyle and formed via knockdown parenchyma cells. The central vascular strand goes through major part of embryo, and in the areas to where the central vascular strand can not extend, there exists a regional conducting system. The structural traits of seed facilitate species spreading but contrarily confine its efficacy. The results can provide biological foundations for ecological researches related to its population construction.

关 键 词：疏花水柏枝 种子扩散 结构特征 直立型胚 

分 类 号：Q944[生物学—植物学] Q948.11