Serial Section-Based Three-Dimensional Reconstruction of Anaxagorea (Annonaceae) Carpel Vasculature and Implications for the Morphological Relationship between the Carpel and the Ovule.
Serial Section-Based Three-Dimensional Reconstruction of Anaxagorea (Annonaceae) Carpel Vasculature and Implications for the Morphological Relationship between the Carpel and the Ovule.
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DOI：
10.3390/plants10102221
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发表时间：
2021-10-19
期刊：
影响因子：
--
通讯作者：
Wang XF
中科院分区：
文献类型：
--
作者：
Li Y;Du W;Chen Y;Wang S;Wang XF
长期以来，阐明花的起源一直是植物学中的一个挑战。围绕花起源的核心问题之一是如何解释心皮，特别是叶状体部分(心皮壁)和胚珠之间的关系。最近，共识倾向于心皮起源于胚珠着生部分和遮盖胚珠的叶状体部分的融合。考虑到心皮是一个复杂的器官，为了解决这个问题，心皮的解剖结构的准确呈现是必要的。番荔枝属(Anaxagorea)是番荔枝科被子植物中最基本的一个属。每个心皮底部明显的柄使其成为探索花托、心皮和胚珠之间组织学关系的理想材料。在本研究中，我们描述了卢宋和爪哇的花器官发生和维管系统，并在连续切片的基础上重建了心皮维管系统的三维模型。结果表明，在天南星属植物中，心皮中的维管系统以枝条的形式存在。放射对称的维管系统在胚珠的花托、心皮和珠柄中反复出现。这为心皮的复合起源提供了解剖学证据。
Elucidating the origin of flowers has been a challenge in botany for a long time. One of the central questions surrounding the origin of flowers is how to interpret the carpel, especially the relationship between the phyllome part (carpel wall) and the ovule. Recently, consensus favors the carpel originating from the fusion of an ovule-bearing part and the phyllome part that subtends it. Considering the carpel is a complex organ, the accurate presentation of the anatomical structure of the carpel is necessary for resolving this question. Anaxagorea is the most basal genus in a primitive angiosperm family, Annonaceae. The conspicuous stipe at the base of each carpel makes it an ideal material for exploring the histological relationships among the receptacle, the carpel, and the ovule. In the present study, floral organogenesis and vasculature were delineated in Anaxagorea luzonensis and Anaxagorea javanica, and a three-dimensional model of the carpel vasculature was reconstructed based on serial sections. The results show that in Anaxagorea, the vasculature in the carpel branches in the form of shoots. The radiosymmetrical vasculature pattern is repeatedly presented in the receptacle, the carpel, and the funiculus of the ovule. This provides anatomical evidence of the composite origin of the carpel.
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