Embryology and relationships of Lauraceae (Laurales)
Embryology and relationships of Lauraceae (Laurales)
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樟科 (Laurales) 的胚胎学和亲缘关系
DOI：
10.1111/j.1095-8339.1998.tb01383.x
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发表时间：
1998
影响因子：
2.4
通讯作者：
H. Tobe
中科院分区：
文献类型：
--
作者：
Kweon Heo;H. Werff;H. Tobe
摘要 迄今为止人们对樟科植物的胚胎学知之甚少，在 23 属 35 个物种的基础上进行了研究，以有助于更好地了解科和属关系。所调查属的数据和文献表明，樟科属在胚胎学上非常相似，但各属之间确实存在一些性状差异。根据与其他月桂目科的比较，樟科始终具有与 Hernandiaceae 相同的厚合子胚珠或种子，在合点处具有分枝的拉斐尔维管束（无源性）。然而，由于几个核心的月桂科，如Amborellaceae、Monimiaceae和Gomortegaceae在胚胎学上鲜为人知，因此必须对它们进行研究以进行严格的比较。在樟科中，Cassytha 与该科的其他成员明显不同，因为它具有 ab 初细胞型胚乳（一种原细胞型胚乳，在伞形科中也有报道），而不是像该科其他成员那样具有核型胚乳（无核型），缺乏珠心帽，并且具有由内珠被和外珠被形成的珠孔，这些事实支持 Cassytha 在其自己亚科的传统分类学位置以及该科的其余成员属于另一个亚科。在该科的其他属中，变形虫绒毡层（无源性）将 15 个属（Actinodaphne、Cinnamomum、Laurus 等）与 6 个带有腺绒毡层的属区分开来。此外，从珠心突出的成熟胚囊（无性形）将五个属（Beilschmiedia、Caryodaphnopsis、Cryptocarya、Endiandra、Potameia）和一种 Ocotea（O. rubra）与该科的其他物种区分开来。这些结果可以适当地纳入未来的超属分类中。还讨论了 Ocoteaarubra 在该属内的独特性。
Abstract Embryology of Lauraceae, hitherto poorly known, was investigated on the basis of 35 species from 23 genera to contribute to a better understanding of familial and generic relationships. Data from the genera investigated and from the literature show that the genera of Lauraceae are very similar embryologically, but that differences do exist in a few characters among the genera. Based on comparisons with other families of Laurales, Lauraceae consistently had a pachychalazal ovule or seed with a ramified raphal vascular bundle at chalaza (an apomorphy) in common with Hernandiaceae. However, since several core lauralean families such as Amborellaceae, Monimiaceae, and Gomortegaceae are little known embryologically, these must be studied for critical comparison. Within Lauraceae,Cassythais clearly distinct from the rest of the family in having anab initiocellular type endosperm (a plesiomorphy, also reported inUmbellularia) instead of a nuclear type endosperm (an apomorphy) as in the rest of the family, in lacking the nucellar cap and in having the micropyle formed by both the inner and outer integument, facts supporting the traditional taxonomic placement ofCassythain its own subfamily and the remainder of the family in the other subfamily. Within the rest of the family, the amoeboid tapetum (an apomorphy) distinguishes 15 genera (Actinodaphne,Cinnamomum,Laurus, etc.) from the six genera with the glandular tapetum. In addition, a mature embryo sac protruding from the nucellus (an apomorphy) distinguishes five genera (Beilschmiedia,Caryodaphnopsis,Cryptocarya,Endiandra,Potameia) and one species ofOcotea(O. rubra) from the rest of the family. These results can properly be incorporated in a future suprageneric classification. The distinctness ofOcotearubrawithin the genus is also discussed.