城市里的花朵不会开放:马齿苋在城市种群中的植物生殖特性进化。

IF 3.6 2区 生物学 Q1 PLANT SCIENCES
Tomohiro Fujita, Naoe Tsuda, Dai Koide, Yuya Fukano, Tomomi Inoue
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引用次数: 0

摘要

背景和目的:城市化对植物进化的影响,尤其是生殖性状的进化,在很大程度上仍是未知的。本研究旨在调查城市化对日本关东地区马齿苋生殖性状的影响。马齿苋(Portulaca oleracea)具有独特的裂殖生殖系统,该系统由遗传决定的裂殖(chasmogamous,open,CH)和闭殖(cleistogamous,close,CL)植株组成:方法:我们从农村地区和城市地区各采集了 10 个种群的野油菜种子。在一个普通花园实验中,我们记录了花的类型(CH 或 CL)、生殖物候和种子产量:主要结果:所有个体都开出了CH或CL花,因此我们可以将它们归类为CH或CL植物。我们观察到,农村和城市人口中 CH 和 CL 植物的普遍性存在显著差异:CH 植物的数量普遍较低,尤其是在城市个体中。与CH植株相比,CL植株的物候期更早,结出的种子更重,这与城市地区为应对高温和干旱胁迫条件而采取的胁迫回避措施是一致的:结论:我们的研究结果表明,城市化可能会促使油菜的裂殖生殖系统发生进化变化。物候期较早、种子较大的瓜叶菊可能更适应城市环境,因为在城市环境中,瓜叶菊会受到严酷的高温和干旱胁迫。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The flower does not open in the city: evolution of plant reproductive traits of Portulaca oleracea in urban populations.

Background and aims: The impact of urbanization on plant evolution, particularly the evolution of reproductive traits, remains largely unknown. In this study, we aimed to investigate the consequences of urbanization on the reproductive traits of Portulaca oleracea in the Kantō region of Japan. Portulaca oleracea has a unique cleistogamous reproductive system, which consists of genetically determined chasmogamous (open, CH) and cleistogamous (closed, CL) plants.

Methods: We collected seeds of P. oleracea from ten populations in rural areas and ten populations in urban areas. In a common garden experiment, we recorded the type of flowers (CH or CL), reproductive phenology and seed production.

Key results: All individuals produced either CH or CL flowers, allowing us to classify them as either CH or CL plants. We observed a significant difference in the prevalence of CH and CL plants between rural and urban populations: the number of CH plants was generally low and was particularly low among urban individuals. Compared to CH plants, CL plants showed earlier phenology and produced heavier seeds, which is consistent with stress avoidance in response to heat and drought stress conditions in urban areas.

Conclusions: Our findings suggest that urbanization may drive an evolutionary change in the cleistogamous reproductive system of P. oleracea. CL plants with earlier phenology and larger seeds might be better adapted to urban environments, where they are subjected to harsh heat and drought stress.

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来源期刊
Annals of botany
Annals of botany 生物-植物科学
CiteScore
7.90
自引率
4.80%
发文量
138
审稿时长
3 months
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.
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