Programa de Pós-graduação em Botânica, Escola Nacional de Botânica Tropical, Rua Pacheco Leão 2040, Solar da Imperatriz, Rio de Janeiro, 22460-036, Brazil.
Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 915, Rio de Janeiro, 22460-030, Brazil.
J Plant Res. 2022 Mar;135(2):259-274. doi: 10.1007/s10265-021-01367-4. Epub 2022 Jan 7.
This study aimed to describe the origin, position, development and typology of inflorescences in Miconieae through ontogenetic and morphological analyses using light microscopy. We observed three morphological character states: terminal, pseudo-axillary and axillary; and two ontogenetic states: terminal and axillary. The terminal and pseudoaxillary inflorescences originate from terminal reproductive meristems. Pseudoaxillary inflorescences result from unequal development of vegetative meristems which flank the terminal flowering unit, whereas in terminal inflorescences, both vegetative meristems develop equally. In axillary inflorescences, the terminal reproductive meristem is not involved, while axillary inflorescences originate from reproductive axillary meristems. The inflorescences range from heterocladic and thyrsoid to simpler types, such as botryoid and triad. Such characteristics can also be seen in paracladia, particularly those most distal. The terminal inflorescence is observed in all clades of Miconieae, and pseudoaxillary and axillary inflorescences should be apomorphic states in the tribe and derived from the terminal condition.
本研究旨在通过使用光学显微镜进行个体发生和形态分析，描述卫矛科植物花序的起源、位置、发育和类型。我们观察到三种形态特征状态：顶生、假腋生和腋生；以及两种个体发生状态：顶生和腋生。顶生和假腋生花序起源于顶生生殖分生组织。假腋生花序是由侧翼顶生花单位的营养分生组织发育不均引起的，而在顶生花序中，两个营养分生组织发育均等。在腋生花序中，不涉及顶生生殖分生组织，而腋生花序起源于生殖腋生分生组织。花序从异型和聚伞花序到更简单的类型，如瓶状和三歧。这种特征也可以在拟小檗中看到，特别是最远端的那些。顶生花序存在于卫矛科的所有分支中，假腋生和腋生花序应该是该族的特化状态，并且是从顶生状态衍生而来的。
