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首页> 外文期刊>Flora >Ruellia subsessilis (Nees) Lindau (Acanthaceae): A species with a sexual reproductive system that responds to different water availability levels
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Ruellia subsessilis (Nees) Lindau (Acanthaceae): A species with a sexual reproductive system that responds to different water availability levels

机译：Ruellia subsessilis（Nees）Lindau（Acanthaceae）：一种具有性生殖系统的物种，对不同的可用水量有响应

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In Ruellia subsessilis the typical cleistogamy (cleistogamous and chasmogamous morphs), which is common in species of this genus, was not observed. Flowering and fruiting of this species are continuous and the selfing flowers are polymorphic. Objective of present study was to analyze the mechanisms of self-pollination in R. subsessilis. In addition, we studied its reproductive phenology, floral biology, breeding system, seed germination and how its sexual reproductive system responds to different water availability levels. The study was conducted with plants of a natural population and others in a greenhouse, under different water availability levels, in southeastern Brazil. The distribution of the reproductive phenophases. was seasonal and concentrated in the rainy season. Production of distinct floral morphs could be observed. These different morphs are named 'reduced chasmogamous morphs' (RC), in the dry season, and 'normal chasmogamous morphs' (NC), which latter develop in the rainy season. The morph production of the cultivated plants was likewise influenced by water availability: RC developed under drought stress and NC in moist soil. Significant differences between morphs were observed in size parameters of the corolla, androecium and gynoecium, and concerning the number of ovules and pollen grains. In both morphs, selfing occurred late (delayed self-pollination), and pre-anthesis cleistogamy (early self-pollination) occurred sporadically in RC. The seeds resulting from self-pollination were more vigorous and germinated faster than those from cross-pollination. (C) 2014 Elsevier GmbH. All rights reserved.
机译：在半灰质Ruellia subsessilis中，未观察到在该属物种中常见的典型的同卵异形（cleosogamous和chasmogamous变体）。该物种的开花结果是连续的，自交花是多态的。本研究的目的是分析亚紫苏的自花授粉机制。此外，我们研究了其生殖物候，花卉生物学，育种系统，种子萌发以及其有性生殖系统如何响应不同的水利用率。这项研究是在巴西东南部，以不同水分利用水平的自然种群和温室中其他种群的植物进行的。生殖表相的分布。是季节性的，集中在雨季。可以观察到产生独特的花形。这些不同的变体在干旱季节被称为“减少的浮雕变种”（RC），而在雨季则被称为“正常的浮雕变种”（NC）。栽培植物的形态产生也受到水分的影响：RC在干旱胁迫下发育，而NC在潮湿的土壤中发育。在花冠，雄蕊和雌蕊的大小参数以及胚珠和花粉粒的数量上观察到形态之间的显着差异。在这两种形态中，自交发生在晚期（延迟的自花授粉），而花期前的通婚（早期自花授粉）在RC中偶尔发生。自花授粉产生的种子比异花授粉的种子更有活力且发芽更快。 （C）2014 Elsevier GmbH。版权所有。

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