首页 > 分享 > Exploring floral morphoanatomy and embryology in wild populations of Chrysolaena flexuosa (Vernonia, Asteraceae): a contribution to understanding its ornamental potential,Protoplasma

Exploring floral morphoanatomy and embryology in wild populations of Chrysolaena flexuosa (Vernonia, Asteraceae): a contribution to understanding its ornamental potential,Protoplasma

花匠小妙招
2025-08-13 07:40

Chrysolaena flexuosa (Sims.) H. Rob. is a South American species in the tribe Vernonieae, with potential ornamental value: it has attractive inflorescences, is suitable for pot cultivation, and its cypselae are useful for dried flower arrangements. Apart from studies on the growth dynamics of this species under cultivation, chromosome number, DNA content, ploidy level, size, pollen viability, and the characterization of phenotypic and genetic variability, it is noteworthy that other aspects regarding the floral architecture, reproductive mode, and gametophyte formation of C. flexuosa have not yet been studied. For this reason, our study encompasses a floral morphoanatomical survey and a comprehensive assessment of gametophyte development in the species. As a result of this study, we report new floral morphotypes, confirming that the morphological variability of the species might be greater than speculated. The morphoanatomy of the androecium and gynoecium and the male and female gametophyte developmental characteristics are uniform in all the populations studied despite the different ploidy levels. Chrysolaena flexuosa has five tetrasporangiate stamens of the dicotyledonous type of development; all the populations studied displayed a unilocular inferior ovary with a single anatropous, unitegumented, and tenuinucellar ovule. Given that all the embryo sacs observed were of the Polygonum-type development regardless of the ploidy level, we infer that the populations analyzed are fertile and undergo sexual reproduction. Our results not only contribute further research in the field of breeding systems and propagation of this species, but also promote the successful introduction of C. flexuosa to the plant ornamental market.

中文翻译：

探索弯曲金龟子（斑斑鸠菊科，菊科）野生种群的花形态解剖学和胚胎学：有助于了解其观赏潜力

Chrysolaena flexuosa (Sims.) H. Rob.是南美斑鸠菊族的一个物种，具有潜在的观赏价值：它具有诱人的花序，适合盆栽，其cypselae可用于干花插花。除了对栽培中该物种的生长动态、染色体数目、DNA 含量、倍性水平、大小、花粉活力以及表型和遗传变异特征的研究外，值得注意的是有关花结构、繁殖模式的其他方面， C. flexuosa的配子体形成和配子体形成尚未被研究。因此，我们的研究包括花卉形态解剖学调查和对该物种配子体发育的全面评估。作为这项研究的结果，我们报告了新的花形态类型，证实该物种的形态变异可能比推测的更大。尽管倍性水平不同，但在所有研究的群体中，雄蕊和雌蕊的形态解剖学以及雄性和雌性配子体发育特征是一致的。 Chrysolaena flexuosa有五个双子叶发育类型的四孢子囊雄蕊；所有研究的群体都显示出单房的下卵巢，具有单个倒生、单珠被和细珠心的胚珠。鉴于无论倍性水平如何，观察到的所有胚囊都是蓼型发育，我们推断所分析的群体是可育的并且进行有性生殖。我们的成果不仅有助于该物种育种系统和繁殖领域的进一步研究，而且促进了C. flexuosa 进入植物观赏市场。