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Embryology of Styracaceae and implications for the evolution of the integument number in Ericales
Botanical Journal of the Linnean Society ( IF 2.4 ) Pub Date : 2020-03-19 , DOI: 10.1093/botlinnean/boaa007
Ikumi Shinke 1 , Toru Tokuoka 1
Affiliation  

Phylogenetic relationships in Styracaceae are well understood, but embryological characters and the ontogeny of integument(s) are still uncertain in many species. The goals of this study are to evaluate the systematic implications of embryological characters in Styracaceae, clarify the character evolution of the number of integuments and suggest a mechanism for the transition between unitegmic and bitegmic ovules. We examined the embryological characters of four genera and five species of Styracaceae, most of which were shared across taxa. However, Styrax has specific embryological features including bitegmic ovules, a multiplicative and sclerotic outer mesotesta and vascular bundles in the testa, all possible autapomorphies. The other three genera of Styracaceae share a unitegmic ovule, a parenchymatous mesotesta and a seed coat without vascular bundles, possible plesiomorphies with Diapensiaceae and Symplocaceae. The transition from a unitegmic to a bitegmic condition can be interpreted to be caused by a downwards shift of the boundary between the inner and outer integument, due to reduced activity in the subdermal initials and increased activity in the dermal initials of the outer integument at its base.

中文翻译:

戟科的胚胎学及其对Ericalis皮层数演变的影响

戟科的系统发生关系是众所周知的,但在许多物种中仍不确定胚胎学特征和外被的存在。这项研究的目的是评估戟科的胚胎学特征的系统性含义,阐明被膜数量的特征演变,并提出单卵胚和小卵胚胚珠之间过渡的机制。我们检查了菊科的四个属和五个物种的胚胎学特征,其中大多数在整个分类群中都共享。但是,施泰拉克斯具有特定的胚胎学特征,包括咬合胚珠,睾丸中的增殖性和硬化性中胚层以及血管束,所有可能的亚型。戟科的其他三个属共享一个单卵胚珠,一个薄壁的中胚轴和一个没有维管束的种皮,可能与Diapsiaceae和Symplocaceae有多形性。可以解释为由单一个体到个体个体的过渡是由于内部和外部被膜之间的边界向下移动引起的,这是由于外部被膜在其外部的皮下组织的活性降低和在皮肤被皮革的初始中的活性增加所致。基础。
更新日期:2020-03-19
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