| 昆栏树属、水青树属和领春木属花粉形态的研究 |
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| 引用本文： | 王伏雄,钱南芬,张玉龙.昆栏树属、水青树属和领春木属花粉形态的研究[J].中国科学院研究生院学报,1984,22(6):456-460. |
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| 作者姓名： | 王伏雄 钱南芬 张玉龙 |
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| 作者单位： | (中国科学院植物研究所，北京) |
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| 摘 要： | 昆栏树属(Trochodendron)、水青树属(Tetracentron)和领春木属(Euptelea)是一群 种数少而较原始的被子植物。它们主要分布于我国。 对于它们的系统位置存在着不同的看 法。因此本研究的目的，一方面为讨论系统位置时提供孢粉学的资料，另一方面也可为鉴定化 石花粉提供依据。 从花粉形态看，支持这三个属分别成立三个科。昆栏树属和水青树属花粉具三沟，而木兰科为单槽类型，因此不同意把它们放在木兰科(或目)。领春木属花粉具皱(rugate)，皱膜上具粗颗粒(短条)，如果皱进一步缩短和增加数目，类似于金缕梅科某些属，因此支持ronquist
(1968)把领春木科放在金缕梅目。Hutchinson(1969)把昆栏树属和领春木属放在同一科(昆栏树科)，从形态结构，导管存在与否，染色体数目，这两属差异较大，同时花粉的形态差别也较大，本文不支持这种观点。
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| 关 键 词： | 昆栏树属 水青树属 领春木属 花粉形态 |
A Study on the Pollen Morphology in Trochodendron, Tetracentron and Euptelea |
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| Wang Fu-Hsiung,Chien Nan-Fang,Zhang Yu-Long.A Study on the Pollen Morphology in Trochodendron, Tetracentron and Euptelea[J].Journal of the Graduate School of the Chinese Academy of Sciences,1984,22(6):456-460. |
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| Authors: | Wang Fu-Hsiung Chien Nan-Fang Zhang Yu-Long |
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| Institution: | (Institute of Botany, Academia Sinica, Beijing) |
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| Abstract: | Trochodendron, Tetracentron and Euptelea are considered as a small
group of the primitive angiosperms. They are endemic to or mainly distributed in China.
Their systematic position has long been debated. The purpose of the present work is to
present palynological data both for systematic discussion and for the identification of
fossil pollen.
The three genera share a number of pollen characters, for example, being spheroid
in shape, exine surface distinctly reticulate and lumina rather small and irregular in
shape, etc. They are, however, obviously different in other respects of pollen morphol-
ogy. The pollen grains of Euptelea are the largest of three (c. 30 μm in diameter), those
of Tetracentron, the smallest (c. 15) and those of Trochodendron, intermediate (c. 20),
3-colpate in Trochodendron and Tetracentron, and those in Euptelea are 3-celpate but
with transitional apertures in one species and 6-rugate, not 3-colpate, in the other. The
ruga membranes are coarsely granular (rod-shaped elements under SEM). The lumina
are the smallest in Euptelea. Muri in Tetracentron are distinctly striate. Thus, the es-
tablishment of three separate families is supported by pollen morphology.
Since the pollen grains of Trochodendron and Tetracentron are 3-colpate and those
of Magnoliaceae are 1-sulcate, it seems unreasonable to refer them to Magnoliaceae (or
Magnoliales). If the rugae of pollen grains in Euptelea further shortened and their
number increased, they would resemble those of Hamamelidaceae (such as Sycopsis).
Pollen morphology, therefore, suggests that Euptelea is related to Hamamelidales, and
supports Cronquist’s viewpoint. Hutchinson (1969) includes both Trochodendron and
Euptelea in the same family (Trochodendraceae). However, these two genera are rather
distinct in morphology and structure, the presence or absence of vessels and chromosome
number, etc. Pollen morphology of two genera also disagrees with the Hutchinson’s
viewpoint. |
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| Keywords: | Trochodendron Tetracentron Euptelea pollen morphology |
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