Inflorescence and flower development in the Hedychieae (Zingiberaceae): Hedychium coccineum Smith
Inflorescence and flower development in the Hedychieae (Zingiberaceae): Hedychium coccineum Smith
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DOI：
10.1007/s00709-010-0145-5
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发表时间：
2010-11-01
期刊：
影响因子：
2.9
通讯作者：
Li, Qing-Jun
中科院分区：
文献类型：
--
作者：
Kong, Ji-Jun;Xia, Yong-Mei;Li, Qing-Jun
白花蛇舌草的花序为聚伞圆锥花序，初级苞片在花序穹顶的两侧以螺旋状的叶序方式启动。Cincinnus原基发生在花序顶端的侧面，在初级苞片的腋处。这个原基随后发育成一个苞片和一个花原基。然后，花原基扩大，顶部变平，变圆。花被片从环状原基的圆角依次发生，花原基继续扩大，形成环状原基。随后，这个环状原基将三个共同的原基分开，围绕一个中央腔。近轴面共同原基是第一次分离。该原基产生后花瓣和可育雄蕊。其余两个共同的原基分开，分别产生一个花瓣和一个花瓣状的内雄蕊成员。随着花的增大，花杯的腔变成圆形三角形的顶端，这些顶端是外雄蕊原基发生的地方。背面的外雄蕊稍早于两个近轴的雄蕊发育。但这个原基在萌发后不久就停止生长，而两个后原基继续生长，形成侧瓣状退化雄蕊。在这个阶段，雌蕊群在花杯中开始生长，并继续生长，直到延伸到唇瓣之外。
The inflorescence of Hedychium coccineum Smith is thyrse, and the primary bracts are initiated in a spiral phyllotactic pattern on the sides of the inflorescence dome. Cincinnus primordia are initiated on the flank of the inflorescence apex, in the axils of primary bracts. This primordium subsequently develops a bract and a floral primordium. Then, the floral primordium enlarges, flattens apically, and becomes rounded. Sepals are initiated sequentially from the rounded corner of the primordium ring sepal initiation, and the floral primordium continues to enlarge and produces a ring primordium. Later, this ring primordium separates three common primordia surrounding a central cavity. The adaxial common primordium is the first separation. This primordium produces the posterior petal and the fertile stamen. The remaining two common primordia separate and produce respectively a petal and a petaloid, the inner androecial member. As the flower enlarges, the cavity of the floral cup becomes a rounded-triangular apex; these apices are the sites of outer androecial primordium initiation. The abaxial outer androecial member slightly forms before the two adaxial members develop. But this primordium ceases growth soon after initiation, while the two posterior primordia continue growth to produce the lateral petaloid staminodes. During this stage, gynoecial initiates in the floral cup and continues to grow until extending beyond the labellum.