Floral morphology and development in Tachigali (Caesalpinioideae, Leguminosae), a predominantly rainforest tree genus with contrasting flower architectures
Floral morphology and development in Tachigali (Caesalpinioideae, Leguminosae), a predominantly rainforest tree genus with contrasting flower architectures
复制标题
DOI：
10.1007/s00606-020-01642-2
复制
发表时间：
2020-02-07
影响因子：
1.9
通讯作者：
De Toni, Karen L. G.
中科院分区：
文献类型：
--
作者：
Casanova, Jamile M.;Cardoso, Domingos;De Toni, Karen L. G.
花发育和形态学的比较研究在很大程度上有助于了解被子植物的分类学分类，系统发育关系和进化趋势，特别是在花多样性的豆科（或豆科）。本研究的目的是表征花发育和形态变异的caesalpinioid属Tachiopathy，主要是新热带雨林树木的进化辐射的中晚期阶段。利用体视显微镜、光学显微镜和扫描电镜对大溪地5种代表植物的花蕾和花进行了形态学和发育学研究。虽然该属显示相对较小的花测量长达14毫米，他们是可变的对称性，结构和大小，这影响了物种之间的主要分类细分。在这里，我们表明，花架构的大奇的雄蕊，花药与圆顶形药隔延伸和单对称托杯，由于其壁的不平等发展在不同阶段的花个体发育的双轮。这样的发展模式可能是新的诊断花性状的Tachiolium的背景下，早期分歧caesalpinioid分支，并重申该属的界限，以包括以前分类在Sclerolobium的物种。
Comparative studies of floral development and morphology have largely contributed to the understanding of taxonomic classification, phylogenetic relationships and evolutionary trends across many angiosperm clades, particularly in the florally diverse family Leguminosae (alternatively Fabaceae). This study aimed to characterize the middle to late stages of floral development and morphological variation of the caesalpinioid genus Tachigali, an evolutionary radiation of predominantly neotropical rainforest trees. Floral buds and flowers of five representative species from Tachigali were analyzed under stereo microscopy, light microscopy and scanning electron microscopy to evaluate informative morphological and developmental characters. Although the genus displays relatively small flowers measuring up to 14 mm long, they are variable in terms of symmetry, structure and size, which have influenced the main taxonomic subdivisions among the species. Here, we show that the floral architecture of Tachigali involves a double whorl of stamens, anthers with dome-shaped connective extension and monosymmetrical hypanthium, owing to the unequal development of its wall at different stages of the floral ontogeny. Such developmental patterns are likely new diagnostic floral characters of Tachigali in the context of the early diverging caesalpinioid clades and reaffirm the circumscription of the genus in order to include the species previously classified within Sclerolobium.