THE DEVELOPMENTAL BASIS OF TRISTYLY IN EICHHORNIA-PANICULATA (PONTEDERIACEAE)
THE DEVELOPMENTAL BASIS OF TRISTYLY IN EICHHORNIA-PANICULATA (PONTEDERIACEAE)
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DOI：
10.2307/2443702
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发表时间：
1984-01-01
影响因子：
3
通讯作者：
BARRETT, SCH
中科院分区：
文献类型：
--
作者：
RICHARDS, JH;BARRETT, SCH
E. paniculata是一种三裂、自交亲和、挺水的水生植物。一个给定的植物产生的花与长，中或短的风格和2级雄蕊长度相等的风格没有发现在花。每种变型的花有两轮3花被片，6雄蕊和3融合心皮。6枚雄蕊分化为2组，每组3枚。一个相对较短的组，具有短或中等水平的雄蕊，出现在花的上侧，而一个相对较长的组，具有中等或长水平的雄蕊，出现在下侧。雄蕊的水平取决于花丝长度和插入花被管的位置的雄蕊之间的差异。花的部分出现在3轮，但2雄蕊轮不形成2套雄蕊发现在每个成熟的花。相反，两个轮生的雄蕊组成一个给定的集合。花的差异之间的变种不存在于花的起源或花器官的启动。形态上的差异首先出现在雄蕊组之间。在减数分裂之前，花内的2组在造孢细胞中可比发育事件的大小、数量和时间上不同。这些最初的差异出现后，花药大小分歧。在后期发育阶段，花丝和花管长度、细胞大小和细胞数量的差异，以及花柱长度、细胞大小和细胞数量的差异，发展出无定形形态。这一序列的发展事件表明，基因控制的发展，在不同的形态不控制花和花器官的启动，但首先在造孢细胞分化形态可见。
E. paniculata is a trisylous, self-compatible, emergent aquatic. A given plant produces flowers with either long, mid or short styles and 2 levels of stamens equal in length to the styles not found in that flower. Flowers of each morph have two whorls of 3 tepals, 6 stamens and 3 fused carpels. The 6 stamens differentiate into 2 sets of 3 stamens each. A relatively short set, having either short- or mid-level stamens, occurs on the upper side of the flower, while a relatively long set, having either mid- or long-level stamens, occurs on the lower side. Stamen level depends on differences among stamens in filament length and position of insertion on the floral tube. Floral parts arise in whorls of 3, but the 2 stamen whorls do not form the 2 sets of stamens found in each mature flower. Instead, stamens from both whorls make up a given set. Floral differences among morphs are not present at flower origin or floral organ initiation. Morphological differences arise first among stamen sets. The 2 sets within a flower differ prior to meiosis in the size, number, and timing of comparable developmental events in the sporogenous cells. After these initial differences arise, anther size diverges. In later developmental stages differences in filament and floral tube length, cell size, and cell number, as well as differences in the length, cell size, and cell number of styles, develop amoung morphs. This sequence of developmental events suggests that the genes controlled development in different morphs do not control flower and floral organ initiation but are first morphologically visible in sporogenous cell differentiation.