Cristopher Albor, Katherine Eisen, Emma Moore, Monica Geber, Tia-Lynn Ashman, Robert A Raguso, Gerardo Arceo-Gomez
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Here, we studied patterns of pollen deposition and pollen tube formation across populations of four predominately outcrossing species in the genus Clarkia to evaluate how richness of co-flowering congeners affects the contribution of pollen quantity and quality to pollen limitation.</p><p><strong>Methods: </strong>We partition variation in pollen deposition and pollen tube production across individuals, populations and species to identify the main sources of variation in components of reproductive success. We further quantify the relative contribution of pollen quantity and quality limitation to the reproductive success of the four Clarkia species using piecewise regression analyses. Finally, we evaluate how variation in the number of co-flowering Clarkia species in the community affects the strength of pollen quality and quality limitation.</p><p><strong>Results: </strong>Across all contexts, pollen deposition and the proportion of pollen tubes produced varied greatly among individuals, populations, and species, and these were not always correlated. For instance, C. xantiana received the smallest pollen loads yet produced the highest proportion of pollen tubes, while C. speciosa exhibited the opposite pattern. Yet, co-flowering richness had variable effects on the strength of pollen quantity and quality limitation among populations. Specifically, breakpoint values, which are an indicator of overall pollen limitation, were two times larger in the four-species community compared with one and two-species communities for two Clarkia species, suggesting that pollen limitation can increase with increasing richness of co-flowering congeners.</p><p><strong>Conclusions: </strong>Our results reveal a complex interplay between quantity and quality of pollen limitation and co-flowering context that may have different evolutionary outcomes across species and populations.</p>","PeriodicalId":8023,"journal":{"name":"Annals of botany","volume":null,"pages":null},"PeriodicalIF":3.6000,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Co-flowering richness has variable effects on pollen quantity and quality limitation in four Clarkia species.\",\"authors\":\"Cristopher Albor, Katherine Eisen, Emma Moore, Monica Geber, Tia-Lynn Ashman, Robert A Raguso, Gerardo Arceo-Gomez\",\"doi\":\"10.1093/aob/mcae136\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Background and aims: </strong>Pollination failure occurs from insufficient pollen quantity or quality. 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引用次数: 0
摘要
背景和目的:授粉失败的原因是花粉数量或质量不足。然而,对于大多数植物种群来说,花粉数量与质量对总体花粉限制的相对贡献,以及这种贡献如何受到同花授粉环境的影响,仍然是未知数。在此,我们研究了克拉克亚属(Clarkia)中四个以外交为主的物种种群的花粉沉积和花粉管形成模式,以评估共花同源物的丰富程度如何影响花粉数量和质量对花粉限制的贡献:方法:我们对个体、种群和物种之间花粉沉积和花粉管产生的差异进行了划分,以确定繁殖成功率各组成部分差异的主要来源。通过片断回归分析,我们进一步量化了花粉数量和质量限制对四个克拉克利亚物种繁殖成功率的相对贡献。最后,我们评估了群落中共同开花的 Clarkia 种类数量的变化如何影响花粉质量和质量限制的强度:结果:在所有情况下,不同个体、种群和物种的花粉沉积量和花粉管比例差异很大,而且并不总是相互关联。例如,C. xantiana 收到的花粉量最小,但产生的花粉管比例却最高,而 C. speciosa 则表现出相反的模式。然而,同花富集度对不同种群间花粉数量和质量限制的强度有不同的影响。具体来说,作为整体花粉限制指标的断点值在四种群落中比两种克拉克亚属植物的单种和双种群落大两倍,这表明花粉限制会随着共花同源物丰富度的增加而增加:我们的研究结果揭示了花粉限制的数量和质量与共花环境之间复杂的相互作用,这可能会在不同物种和种群之间产生不同的进化结果。
Co-flowering richness has variable effects on pollen quantity and quality limitation in four Clarkia species.
Background and aims: Pollination failure occurs from insufficient pollen quantity or quality. However, the relative contributions of pollen quantity vs quality to overall pollen limitation, and how this is affected by the co-flowering context, remain unknown for most plant populations. Here, we studied patterns of pollen deposition and pollen tube formation across populations of four predominately outcrossing species in the genus Clarkia to evaluate how richness of co-flowering congeners affects the contribution of pollen quantity and quality to pollen limitation.
Methods: We partition variation in pollen deposition and pollen tube production across individuals, populations and species to identify the main sources of variation in components of reproductive success. We further quantify the relative contribution of pollen quantity and quality limitation to the reproductive success of the four Clarkia species using piecewise regression analyses. Finally, we evaluate how variation in the number of co-flowering Clarkia species in the community affects the strength of pollen quality and quality limitation.
Results: Across all contexts, pollen deposition and the proportion of pollen tubes produced varied greatly among individuals, populations, and species, and these were not always correlated. For instance, C. xantiana received the smallest pollen loads yet produced the highest proportion of pollen tubes, while C. speciosa exhibited the opposite pattern. Yet, co-flowering richness had variable effects on the strength of pollen quantity and quality limitation among populations. Specifically, breakpoint values, which are an indicator of overall pollen limitation, were two times larger in the four-species community compared with one and two-species communities for two Clarkia species, suggesting that pollen limitation can increase with increasing richness of co-flowering congeners.
Conclusions: Our results reveal a complex interplay between quantity and quality of pollen limitation and co-flowering context that may have different evolutionary outcomes across species and populations.
期刊介绍:
Annals of Botany is an international plant science journal publishing novel and rigorous research in all areas of plant science. It is published monthly in both electronic and printed forms with at least two extra issues each year that focus on a particular theme in plant biology. The Journal is managed by the Annals of Botany Company, a not-for-profit educational charity established to promote plant science worldwide.
The Journal publishes original research papers, invited and submitted review articles, ''Research in Context'' expanding on original work, ''Botanical Briefings'' as short overviews of important topics, and ''Viewpoints'' giving opinions. All papers in each issue are summarized briefly in Content Snapshots , there are topical news items in the Plant Cuttings section and Book Reviews . A rigorous review process ensures that readers are exposed to genuine and novel advances across a wide spectrum of botanical knowledge. All papers aim to advance knowledge and make a difference to our understanding of plant science.