REU: Pollen Morphology and Evolution in the Proteaceae

REU：山龙眼科植物的花粉形态和进化

• 批准号: 9006877
• 负责人: Sylvia Forster
• 金额: $ 6万
• 依托单位: DePaul University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-01 至 1992-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9006877&HistoricalAwards=false
• 关键词: REU; Pollen; Morphology; Evolution; Proteaceae

The taxonomic classification of the southern hemisphere plant family Proteaceae, distributed in Australia, South Africa, and South America, is based largely upon morphological features of the flowers and fruits. About 67 genera and 1450 species are currently recognized. To test the classification of these plants with new data, Dr. Sylvia Feuer of DePaul University is investigating the pollen structure and sculpturing of representative samples using light- and electron-microscopy. Fine details of the pollen wall surface and wall layering are being analyzed with cryosections and with transmission electron microscopy, to obtain information useful in determining equivalent features for comparison among pollen from different genera. Patterns of pollen wall structure and sculpture are expected to be similar among closely related groups of taxa, and to exhibit recognizable trends of evolutionary change. Differences among pollen grains of this family that are being described by Dr. Feuer will also allow determination of the correct taxonomic association of dispersed fossil pollens. Grains thought to be from Proteaceae occur in deposits in the northern hemisphere, far outside the current geographic range of the family. Accurate determination of their taxonomic status is prerequisite to resolution of the historical biogeography of these plants and to further analysis of climatic and other controls on plant distribution.

分布于澳大利亚、南非和南美洲的南半球植物科山龙眼科的分类主要基于其花和果实的形态特征。 目前已确认约 67 属、1450 种。 为了用新数据测试这些植物的分类，德保罗大学的 Sylvia Feuer 博士正在使用光学显微镜和电子显微镜研究代表性样品的花粉结构和雕刻。 正在使用冷冻切片和透射电子显微镜分析花粉壁表面和壁分层的精细细节，以获得有助于确定等效特征以比较不同属花粉的信息。 花粉壁结构和雕塑的模式预计在密切相关的类群中是相似的，并表现出可识别的进化变化趋势。 Feuer 博士所描述的该科花粉粒之间的差异也将有助于确定分散的花粉化石的正确分类学关联。 被认为来自山龙眼科的谷物出现在北半球的沉积物中，远远超出了该科目前的地理范围。 准确确定其分类地位是解决这些植物的历史生物地理学以及进一步分析气候和其他对植物分布的控制的先决条件。