Comparative ontogeny of the cyathium in Euphorbia (Euphorbiaceae) and its allies: exploring the organ-flower-inflorescence boundary.
Comparative ontogeny of the cyathium in Euphorbia (Euphorbiaceae) and its allies: exploring the organ-flower-inflorescence boundary.
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DOI：
10.3732/ajb.94.10.1612
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发表时间：
2007-10
影响因子：
3
通讯作者：
Rudall PJ
中科院分区：
文献类型：
--
作者：
Prenner G;Rudall PJ
我们提出了一个详细的比较个体发育分析的所有三个亚科的大戟族（Euphorbiinae，Neoguillaumininiinae，Anthosteminae）的代表假花，以澄清他们的同源性和解释。大戟属（Euphorbia）及其近缘植物（大戟亚科（subtribe Euphorbiinae））的杯状花序与两性花非常相似，但传统上被解释为花序上有一簇高度退化的雄花围绕着一朵顶生的雌花。（2）Neoguillauminiacleopatra的某些雄花中发育较晚的花被状结构;（3）Anthosteminae和Neoguillauminiinae的雌花花被具苞片起源的证据;（4）分离区和花被的时空独立形成。花序，花和花器官之间的模糊界限表明，将杯状花序既不定义为花序也不定义为花是完全令人满意的，并表明杯状花序的“杂交”花/花序性质。根据我们目前的知识和现有的系统发育背景，这是最简约的建议，杯状花序进化从有限聚伞圆锥花序与顶生雌花包围二歧雄性部分花序。我们推测杯状体的形成是因为强烈的凝聚和调控基因表达区之间可能的重叠。
We present a detailed comparative ontogenetic analysis of pseudanthia of representatives of all three subtribes of Euphorbieae (Euphorbiinae, Neoguillauminiinae, Anthosteminae) in order to clarify their homologies and interpretation. The cyathium of Euphorbia and its allies (subtribe Euphorbiinae) closely resembles a bisexual flower but is traditionally interpreted as an inflorescence bearing clusters of highly reduced male flowers surrounding a single terminal female flower. Previously unreported characters are (1) male flowers formed one above the other in the male inflorescences of some Euphorbiinae, (2) late-developing perianthlike structures in some male flowers of Neoguillauminia cleopatra, (3) evidence for a bracteate origin of the female perianth in Anthosteminae and Neoguillauminiinae, and (4) spatiotemporally independent formation of abscission zone and perianth. Indistinct boundaries between inflorescence, flower, and floral organs demonstrate that defining the cyathium neither as an inflorescence nor as a flower is entirely satisfactory and indicate a “hybrid” flower/inflorescence nature of the cyathium. Based on our current knowledge and the existing phylogenetic context, it is most parsimonious to suggest that the cyathium evolved from a determinate thyrse with a terminal female flower surrounded by dichasial male partial inflorescences. We speculate that the cyathium was formed because of strong condensation and possible overlap between expression zones of regulatory genes.
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影响因子：
1.9
作者：
Blarer, A;Nickrent, DL;Endress, PK
通讯作者：
Endress, PK
影响因子：
1.9
作者：
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影响因子：
1.9
作者：
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3
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通讯作者：
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通讯作者：
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