DEVELOPMENT OF TRISTYLY IN PONTEDERIA-CORDATA (PONTEDERIACEAE) .1. MATURE FLORAL STRUCTURE AND PATTERNS OF RELATIVE GROWTH OF REPRODUCTIVE-ORGANS
DEVELOPMENT OF TRISTYLY IN PONTEDERIA-CORDATA (PONTEDERIACEAE) .1. MATURE FLORAL STRUCTURE AND PATTERNS OF RELATIVE GROWTH OF REPRODUCTIVE-ORGANS
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DOI：
10.2307/2443965
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发表时间：
1987-12-01
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
Pontederia Cordata是一种三柱体，自交不亲和的水生植物。通过对花柱、花丝和花管的相对生长速率和成熟花和发育芽生殖器官的测量，分析了花柱形态中生殖器官相互定位的发育过程。花是三叶草，有两个系列的三个花被，两个系列的三个雄蕊，和一个单胚珠的三皮子房。每朵花都有两种长度的雄蕊，但这两种长度对应于颧形花的上下位置，而不是对应于原基开始的两个系列。柱头高度的形态依赖性变异取决于花柱长度的差异，而不是子房长度。花药高度的不同是由于花丝在花筒上插入位置的不同和花丝长度的不同造成的。3种花柱发育速率不同，L花柱比M花柱生长速度快，而S花柱生长速度快，随后生长受到早期抑制。S型雄蕊的生长也与L型和M型雄蕊的生长在质量上存在差异，这是通过生长速率的数量差异来区分的。结果表明，导致不同形态器官互补排列的发育过程具有形态特异性。本文试图将本研究的结果与该病的遗传控制模型相结合。
Pontederia Cordata is a tristylous, self-incompatible emergent aquatic. Measurement of reproductive organs in mature flowers and developing buds and analysis of relative growth rates of the styles, filaments, and floral tube were used to analyze the developmental processes that result in reciprocal positioning of reproductive parts among the style morphs. Flowers are trimerous with two series of three tepals, two series of three stamens, and a tricarpellate ovary with a single ovule. Each flower has stamens of two lengths, but the two lengths correspond to upper vs. lower position in the zygomorphic flowers, not to the two series initiated in the primordium. Morph-dependent variation in stigma height depends on differences in style length, not ovary length. Differences among morphs in anther height result from differences in the position of filament insertion on the floral tube and differences in filament length. Styles of the three morphs develop to different rates with the L style growing more rapidly than the M style, whereas styles of the S morph have a brief period of rapid growth followed by early inhibition. Stamen growth in the S morph also differs qualitatively from that in the L and M morphs, which are distinguished from each other by quantitative differences in growth rates. Results indicate that the developmental processes that result in the complementary arrangements of organs in different morphs are morph-specific. An attempt is made to integrate the findings of this study with the model for genetic control of tristyly.