DISTRIBUTION OF POLLEN TYPES IN VERNONIA (VERNONIEAE, COMPOSITAE)
DISTRIBUTION OF POLLEN TYPES IN VERNONIA (VERNONIEAE, COMPOSITAE)
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DOI：
10.2307/2418418
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发表时间：
1979-01-01
影响因子：
1
通讯作者：
JONES, SB
中科院分区：
文献类型：
--
作者：
KEELEY, SC;JONES, SB
斑鸠菊属（Vernonia）是斑鸠菊族（Vernonieae）中最大的一个属，约有1000种。主要分布于新旧大陆的热带地区。营养特征的形态变异是广泛的;花的特征是相对一致的。这种一致性导致了理解Vernonia内部关系的困难。花粉形态是独特的，并在评估亚属群的分类价值。为了了解该属植物的辐射模式，来自500多个物种的花粉。通过光学显微镜和SEM [扫描电子显微镜]检查了斑鸠菊属的整个地理范围。花粉粒有6种基本类型。花粉类型的分布与相关种组的辐射度有关。一种广泛分布的，可能是祖先的花粉类型在新大陆和旧大陆都有发现，但其他类型只在一个半球或占主导地位。结构变化似乎与功能改变有关。花粉分布的模式反映了属内物种随时间的进化分化，并支持了属的广义概念。
Vernonia is the largest genus of the tribe Vernonieae with nearly 1000 spp. found predominately in the New and Old World tropics. Morphological variation in vegetative features is extensive; floral characters are relatively uniform. This uniformity led to difficulties in understanding relationships within Vernonia. Pollen morphology is distinctive and of taxonomic value in assessing infrageneric groups. To understand the patterns of radiation in the genus, pollen from over 500 spp. of Vernonia was examined from throughout the geographical range by light microscopy and SEM [scanning electron microscope]. There are 6 basic types of pollen grains. The distribution of pollen types is correlated with the radiation of related species groups. A widespread, probably ancestral pollen type is found in both the New and Old Worlds, but other types are exclusive to or predominate in 1 hemisphere. Structural changes appear associated with functional modifications. The pattern of pollen distribution reflects the evolutionary divergence of species within the genus over time and supports a broad concept of the genus.