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首页> 外文期刊>Anais da Academia Brasileira de Ciencias >Germination responses of the invasive Calotropis procera (Ait.) R. Br. (Apocynaceae): comparisons with seeds from two ecosystems in northeastern Brazil
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Germination responses of the invasive Calotropis procera (Ait.) R. Br. (Apocynaceae): comparisons with seeds from two ecosystems in northeastern Brazil

机译：侵入性Calotropis procera（Ait。）的萌发响应。 （Apocynaceae）：与巴西东北部两个生态系统的种子比较

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摘要

Life history traits are considered key indicators of plant invasibility. Among them, the germination behavior of seeds is of major relevance because it is influenced by environmental factors of invaded ecosystem. Here, we investigated how seed traits and seed tolerance to environmental factors on seed germination of Calotropis procera vary depending on the invaded ecosystems in northeastern Brazil. We have tested seeds from two vegetation types – Caatinga and Restinga – to different levels of light intensity, salinity, and water stress. Previous to those experiments, seed-set and morphometric analysis were carried out for both studied populations. We have observed a higher seed-set in Caatinga. Seeds produced in this ecosystem had lower seed moisture content. Seeds from Restinga showed lower germination time when light intensity decreased. We observed a reduction in both the germinability and the synchronization index with decreasing osmotic potential and increasing salinity. Nevertheless, both populations exhibited changes in photoblastism when seeds were submitted to water and saline stress. In conclusion, C. procera seeds are tolerant to environmental factors assessed. That characteristic ensures the colonization success and wide distribution of this plant species in the studied ecosystems.
机译：生活史特征被认为是植物入侵的关键指标。其中，种子的发芽行为与入侵生态系统的环境因素有关，因此具有很大的相关性。在这里，我们调查了巴西东部Calotropis procera种子发芽的种子性状和对环境因素的耐受性如何随巴西东北部入侵的生态系统而变化。我们已经测试了两种植被类型的种子– Caatinga和Restinga –对不同水平的光强度，盐度和水分胁迫。在进行这些实验之前，对两个研究种群均进行了结实和形态计量分析。我们在Caatinga观察到较高的结实率。在这个生态系统中产生的种子具有较低的种子水分含量。当光强度降低时，来自雷廷加的种子显示出较低的发芽时间。我们观察到，随着渗透势的降低和盐度的提高，发芽率和同步指数均降低。然而，当种子经受水和盐胁迫时，两个种群都表现出光母细胞的变化。总之，proc。procera种子耐受所评估的环境因素。该特征确保了定植成功以及该植物物种在所研究的生态系统中的广泛分布。

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