Pollen morphology and character evolution in the subtribe Neoguillauminiinae (Euphorbiaceae)

IF 0.8 Q4 PLANT SCIENCES
Ki-Ryong Park
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引用次数: 0

Abstract

A pollen morphological study was conducted using light and scanning electron microscopy involving six species belonging to the subtribe Neoguillauminiinae. Pollen samples from the six species are tricolporate, and the colpi are surrounded by broad margo, with the widest width in the equator, narrower toward the pole, and rounded at the end. Based on the pollen morphology, pollen of the species in the subtribe Neoguillauminiinae were divided into four types: the Neoguillauminia type (T1), the C. collinus type (T2), the C. casuarinoides type (T3) and the C. paucifolius type (T4). The generic divergence between Neoguillauminia and Calycopeplus was supported by the pollen characters of the size, amb and lumina shape. In particular, the traits of rounded shape in the outline of the polar view and circular lumina, which appear only in the pollen grains of N. cleopatra, support the recognition of Neoguillauminia as a monotypic genus. Calycopeplus oligandrus and C. paucifolius had the same reticulate pattern of pollen grains, supporting Forster’s hypothesis that these two species are closely related. On the other hand, the close relationship between the morphologically similar C. collinus and C. casuarinoides was not supported by the pollen characters. Within the subtribe there are two equally parsimonious hypotheses regarding the evolution of exine characters. The first consists of two changes of microreticulate through parallel evolution from the primitive reticulate exine, and the second is that the microreticulate pattern is differentiated from the reticulate state and then reversed to reticulate pollen grains.
大戟科新guillauminiinae亚族花粉形态与特征演化
利用光镜和扫描电子显微镜对新灰蝶亚科六个种的花粉进行了形态学研究。这六个物种的花粉样本都是三孔的,绒毛被宽阔的边缘包围,宽度在赤道最宽,向极地变窄,末端圆形。根据花粉形态,将该亚种的花粉分为四个类型:新冠灰蝶型(T1)、柯氏灰蝶(T2)、木麻黄型(T3)和贫灰蝶(T4)。新灰蝶属和灰蝶属之间的属间差异是由花粉的大小、amb和lumina形状的特征所支持的。特别是,仅出现在N.cleopatra花粉粒中的极观轮廓中的圆形形状和圆形腔的特征,支持了将新纪尧姆属视为一个单型属的认识。Calycopeplus oligandrus和C.paucifolius具有相同的网状花粉粒模式,支持了福斯特的假说,即这两个物种关系密切。另一方面,形态相似的C.collinus和C.casuarioides之间的密切关系并没有得到花粉特征的支持。在子树中,有两个关于外显特征进化的同样简约的假设。第一种是由原始网状外壁平行进化而来的两种微网状变化,第二种是微网状模式从网状状态分化为网状花粉粒。
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来源期刊
KOREAN JOURNAL OF PLANT TAXONOMY
KOREAN JOURNAL OF PLANT TAXONOMY Agricultural and Biological Sciences-Plant Science
CiteScore
1.50
自引率
40.00%
发文量
23
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