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穇属颖果微形态及其系统学意义
引用本文:姜斌,Paul M. PETERSON,刘青.穇属颖果微形态及其系统学意义[J].热带亚热带植物学报,2011,19(3):195-204.
作者姓名:姜斌  Paul M. PETERSON  刘青
作者单位:1. 中国科学院华南植物园,中国科学院植物资源保护与可持续利用重点实验室,广州510650;中国科学院研究生院,北京100049
2. Department of Botany,Smithsonian Institution,Washington DC 20013-7012,USA
3. 中国科学院华南植物园,中国科学院植物资源保护与可持续利用重点实验室,广州510650
基金项目:国家自然科学基金项目(30700043); 中国科学院植物资源保护和可持续利用重点实验室项目(200922); 国家留学基金管理委员会国家公派访问学者项目(2008491004); 中国科学院生命科学领域基础前沿研究专项 (KSCX2-EW-J-28)
摘    要:在电子扫描显微镜下观察了穆属(Eleusine Gaertn.)9种植物颖果的微形态特征.结果表明,穆属颖果有卵形、披针形和矩圆形3种腹面形状,压扁方式有背腹压扁及两侧压扁,腹面形态有平腹面和凹腹面两种,胚比为0.29~0.58,种脐比为0.10~0.24,颖果纹饰有2种,包括疣突状一级纹饰和疣突规则排列构成的复合网状...

关 键 词:穇属  颖果  微形态  分类  禾本科
收稿时间:2010/9/10 0:00:00
修稿时间:1/19/2011 3:56:15 PM

Caryopsis Micromorphology of Eleusine Gaertn. (Poaceae) and Its Systematic Implications
JIANG Bin,Paul M. PETERSON and LIU Qing.Caryopsis Micromorphology of Eleusine Gaertn. (Poaceae) and Its Systematic Implications[J].Journal of Tropical and Subtropical Botany,2011,19(3):195-204.
Authors:JIANG Bin  Paul M PETERSON and LIU Qing
Institution:1. Key laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences; 2. Graduate University of Chinese Academy of Sciences,Department of Botany, Smithsonian Institution,South China Botanical Garden, Chinese Academy of Sciences
Abstract:Caryopsis micromorphological characteristics of nine species of Eleusine were studied using the scanning electron microscopy (SEM). The results showed that there were three types of ventral shapes in caryopses including oval, lanceolate, and oblong, two types of compression including dorsiventral and lateral, two types of ventral faces including flat and concave. The embryo proportion ranged from 0.29 to 0.58, and hilum proportion from 0.10 to 0.24. There were two types of surface sculpture including the verrucate simple sculpture and the compound reticulate sculpture composed by the regular spread of verrucae. The mean diameter of caryopsis foveola ranged from 0.57 µm to 1.31 µm with a density from 30 to 200 in 100 µm2. It can be concluded that caryopsis ventral shape, sculpture, and foveola are very useful characteristics for the identification of species and the inference of interspecific relationships in Eleusine. Because of the flat and concave ventral face, caryopses of Eleusine have relatively small bulk, therefore possibly aiding rapid development and maturation. All characters seem to be particularly valuable in climates of East Africa seasonal drought.
Keywords:Eleusine  Caryopsis  Micromorphology  Classification  Poaceae
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