Pollen Diversity in Some Modern Magnoliids
Pollen Diversity in Some Modern Magnoliids
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DOI：
10.1086/317573
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发表时间：
2000-11
影响因子：
2.3
通讯作者：
F. B. Sampson
中科院分区：
文献类型：
--
作者：
F. B. Sampson
花粉形态总结了大多数家庭的木兰，包括未发表的意见。这项调查探讨在何种程度上花粉类型和可能的进化趋势，在这些基础被子植物可以链接到最近的分子和非分子分支分析的结果。特别考虑到比较花粉的“ANITA”分支类似的“木兰I”组与“eumagnoliid”分支（“木兰II”组）内的单子叶植物分组，这是更密切相关的更高的双子叶植物（真双子叶植物）。我的结论是，有没有根本的差异之间的花粉ANITA和eumagnoliid集团。祖先被子植物花粉粒可能是单沟的，具有远侧孔和均匀或部分颗粒状的外壁，并具有内外壁和双层内壁，外层有通道，后者可能最初仅限于孔区。
Pollen morphology is summarized for most families of magnoliids, including unpublished observations. This survey explores the extent to which pollen types and possible evolutionary trends in these basal angiosperms can be linked to the results of recent molecular and nonmolecular cladistic analyses. Particular consideration is given to comparing pollen of the “ANITA” clades—similar to the “magnoliid I” group—with the “eumagnoliid” clade (“magnoliid II” group) within which the monocots are grouped and which is more closely related to higher dicots (eudicots). I conclude that there are no fundamental differences between pollen of the ANITA and eumagnoliid groups. The ancestral angiosperm pollen grain was probably monosulcate with a distal aperture and a homogeneous or partly granular ectexine and possessed an endexine and a two‐layered intine with a channeled outer layer, with the latter probably initially restricted to apertural regions.