当前位置: X-MOL 学术Plant Syst. Evol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Spicoid ontogeny in Diplasia (Mapanioideae, Cyperaceae): an approach on the developmental processes operating in Mapanioideae spicoids
Plant Systematics and Evolution ( IF 1.9 ) Pub Date : 2020-11-06 , DOI: 10.1007/s00606-020-01720-5
Mariana Maciel Monteiro , Diego Demarco , Aline Oriani , Chrissie Prychid , Gerhard Prenner

Mapanioideae (besides Cyperoideae the other subfamily of Cyperaceae) is divided in two tribes (Hypolytreae and Chrysitricheae) in which the reproductive units (spicoids) are interpreted either as flowers or as inflorescences. Little is known about the ontogenetic factors operating during the spicoid development and how they may contribute to the spicoid final morphology. In this context, we studied the spicoid development in the monotypic genus Diplasia and compared it with other developmental studies in Mapanioideae. Our results show that the main developmental variations are related to the sequence of organ formation, the size and shape of the spicoid primordium and the influence of the subtending bract constraints in different sides of such primordium. Our hypotheses to explain the spicoid’s morphological variation in Mapanioideae are: that size and shape of the spicoid primordium contribute to changes in the number and position of organs to be formed, and spatial constraints of the subtending bracts influence the reduction of adaxial parts. Developmental features of the spicoids showed to be stable within the tribe. Our observations of the nature of spicoids in Diplasia give arguments for both, floral and inflorescence interpretations, sustaining the uncertainty towards a satisfactory definition. The difficulty in distinguishing the boundaries of flower and inflorescence nature in the spicoids raised a third hypothesis where the spicoid could be interpreted as a de novo structure, due to a reorganisation of regulatory genes resulting in a single unit with flower and inflorescence features combined, considered a synapomorphy of Mapanioideae.

中文翻译:

Diplasia (Mapanioideae, Cyperaceae) 中的 Spicoid 个体发育:一种在 Mapanioideae spicoids 中运行的发育过程的方法

Mapanioideae(除了 Cyperoideae 之外,Cyperaceae 的另一个亚科)分为两个部落(Hypolytreae 和 Chrysitricheae),其中生殖单位(spicoids)被解释为花或花序。关于在 spicoid 发育过程中起作用的个体遗传因素以及它们如何影响 spicoid 最终形态,我们知之甚少。在这种情况下,我们研究了单型属 Diplasia 的穗状体发育,并将其与 Mapanioideae 中的其他发育研究进行了比较。我们的研究结果表明,主要的发育变异与器官形成的顺序、穗状原基的大小和形状以及这种原基不同侧对向苞片约束的影响有关。我们的假设解释了马帕尼科中 spicoid 的形态变异:穗状原基的大小和形状有助于形成器官的数量和位置的变化,对着苞片的空间限制影响近轴部分的减少。spicoids 的发育特征显示在部落内是稳定的。我们对 Diplasia 中穗状花序的性质的观察为花和花序的解释提供了论据,维持了对令人满意的定义的不确定性。区分花和花序性质的界限的困难提出了第三个假设,即由于调控基因的重组导致花和花序特征相结合的单个单元,因此可以将 spicoid 解释为从头结构。 Mapanioideae 的一种突触。
更新日期:2020-11-06
down
wechat
bug