Floral morphology and development in Aragoa (Plantaginaceae) and related members of the order lamiales
Floral morphology and development in Aragoa (Plantaginaceae) and related members of the order lamiales
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DOI：
10.1086/422046
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发表时间：
2004-09-01
影响因子：
2.3
通讯作者：
Fernández-Alonso, JL
中科院分区：
文献类型：
--
作者：
Bello, MA;Rudall, PJ;Fernández-Alonso, JL
研究了野芝麻属及其近缘属的花序和花的形态和发育。Aragoa的每一花序是退化的，腋生的总状花序，在其上辐射对称的花尖通常相继出现。Aragoa和Plantago的花序是多端和侧生的。五个萼片从花端的背面到正面出现，但在成熟时，花萼是辐射对称的。四个雄蕊在花瓣出现之前同时出现。四个花瓣出现单向联合，但花冠变得辐射对称。夏眠是耳蜗上升的。两个合生的心皮同时开始发育。花萼和花冠在花发育早期的属，如Aragoa，洋地黄，车前，婆婆纳的近轴-远轴起始可能表明，左右对称的条件是祖先在这些属。四瓣花冠，这是辐射对称的中期和晚期的发展，和存在的四个雄蕊是可能的synapomophies的分支（Aragoa +车前）。在更广泛的Aragoa-Angelonia分支中，花萼和花冠的五花似乎是近形的。Aragoa的花序和花的发育和形态特征与Plantago中发现的特征基本相似，这与这些属之间基于分子的姐妹群关系一致。
Inflorescence and floral morphology and development were investigated in Aragoa (Plantaginaceae) and related genera. Each inflorescence of Aragoa is a reduced, axillary raceme, on which the actinomorphic floral apices generally arise successively. The inflorescences of Aragoa and Plantago are polytelic and lateral. The five sepals emerge from the abaxial to the adaxial side of the floral apex, but at maturity, the calyx is actinomorphic. The four stamens arise simultaneously and before emergence of the petals. The four petals emerge unidirectionally united, but the corolla becomes actinomorphic. Aestivation is cochlear ascendent. The two united carpels initiate simultaneously. The abaxial-adaxial inception of the calyx and corolla during early floral development in genera such as Aragoa, Digitalis, Plantago, and Veronica may indicate that the zygomorphic condition is ancestral in those genera. The tetramerous corolla, which is actinomorphic during middle and late development, and the presence of four stamens are possible synapomophies of the clade (Aragoa + Plantago). Pentamery of the calyx and corolla appears to be plesiomorphic in the broader Aragoa-Angelonia clade. Characters related to development and morphology of inflorescences and flowers of Aragoa are essentially similar to those found in Plantago, which is consistent with the molecular-based sister group relationship between these genera.